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glib/glib/docs.c
Matthias Clasen 35066ed6c6 Docs: Drop entities, switch away from sgml mode 
Since all element markup is now gone from the doc comments,
we can turn off the gtk-doc sgml mode, which means that from
now on, docbook markup is no longer allowed in doc comments.

To make this possible, we have to replace all remaining
entities in doc comments by their replacement text, & -> &
and so on.
2014-02-09 02:07:26 -05:00

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/*
* Copyright © 2011 Red Hat, Inc
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the licence, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*
* Author: Matthias Clasen
*/
/* This file collects documentation for macros, typedefs and
* the like, which have no good home in any of the 'real' source
* files.
*/
/* Basic types {{{1 */
/**
* SECTION:types
* @title: Basic Types
* @short_description: standard GLib types, defined for ease-of-use
* and portability
*
* GLib defines a number of commonly used types, which can be divided
* into 4 groups:
* - New types which are not part of standard C (but are defined in
* various C standard library header files) - #gboolean, #gsize,
* #gssize, #goffset, #gintptr, #guintptr.
* - Integer types which are guaranteed to be the same size across
* all platforms - #gint8, #guint8, #gint16, #guint16, #gint32,
* #guint32, #gint64, #guint64.
* - Types which are easier to use than their standard C counterparts -
* #gpointer, #gconstpointer, #guchar, #guint, #gushort, #gulong.
* - Types which correspond exactly to standard C types, but are
* included for completeness - #gchar, #gint, #gshort, #glong,
* #gfloat, #gdouble.
*
* GLib also defines macros for the limits of some of the standard
* integer and floating point types, as well as macros for suitable
* printf() formats for these types.
*/
/**
* gboolean:
*
* A standard boolean type.
* Variables of this type should only contain the value
* %TRUE or %FALSE.
*/
/**
* gpointer:
*
* An untyped pointer.
* #gpointer looks better and is easier to use than void*.
*/
/**
* gconstpointer:
*
* An untyped pointer to constant data.
* The data pointed to should not be changed.
*
* This is typically used in function prototypes to indicate
* that the data pointed to will not be altered by the function.
*/
/**
* gchar:
*
* Corresponds to the standard C char type.
*/
/**
* guchar:
*
* Corresponds to the standard C unsigned char type.
*/
/**
* gint:
*
* Corresponds to the standard C int type.
* Values of this type can range from #G_MININT to #G_MAXINT.
*/
/**
* G_MININT:
*
* The minimum value which can be held in a #gint.
*/
/**
* G_MAXINT:
*
* The maximum value which can be held in a #gint.
*/
/**
* guint:
*
* Corresponds to the standard C unsigned int type.
* Values of this type can range from 0 to #G_MAXUINT.
*/
/**
* G_MAXUINT:
*
* The maximum value which can be held in a #guint.
*/
/**
* gshort:
*
* Corresponds to the standard C short type.
* Values of this type can range from #G_MINSHORT to #G_MAXSHORT.
*/
/**
* G_MINSHORT:
*
* The minimum value which can be held in a #gshort.
*/
/**
* G_MAXSHORT:
*
* The maximum value which can be held in a #gshort.
*/
/**
* gushort:
*
* Corresponds to the standard C unsigned short type.
* Values of this type can range from 0 to #G_MAXUSHORT.
*/
/**
* G_MAXUSHORT:
*
* The maximum value which can be held in a #gushort.
*/
/**
* glong:
*
* Corresponds to the standard C long type.
* Values of this type can range from #G_MINLONG to #G_MAXLONG.
*/
/**
* G_MINLONG:
*
* The minimum value which can be held in a #glong.
*/
/**
* G_MAXLONG:
*
* The maximum value which can be held in a #glong.
*/
/**
* gulong:
*
* Corresponds to the standard C unsigned long type.
* Values of this type can range from 0 to #G_MAXULONG.
*/
/**
* G_MAXULONG:
*
* The maximum value which can be held in a #gulong.
*/
/**
* gint8:
*
* A signed integer guaranteed to be 8 bits on all platforms.
* Values of this type can range from #G_MININT8 (= -128) to
* #G_MAXINT8 (= 127).
*/
/**
* G_MININT8:
*
* The minimum value which can be held in a #gint8.
*
* Since: 2.4
*/
/**
* G_MAXINT8:
*
* The maximum value which can be held in a #gint8.
*
* Since: 2.4
*/
/**
* guint8:
*
* An unsigned integer guaranteed to be 8 bits on all platforms.
* Values of this type can range from 0 to #G_MAXUINT8 (= 255).
*/
/**
* G_MAXUINT8:
*
* The maximum value which can be held in a #guint8.
*
* Since: 2.4
*/
/**
* gint16:
*
* A signed integer guaranteed to be 16 bits on all platforms.
* Values of this type can range from #G_MININT16 (= -32,768) to
* #G_MAXINT16 (= 32,767).
*
* To print or scan values of this type, use
* %G_GINT16_MODIFIER and/or %G_GINT16_FORMAT.
*/
/**
* G_MININT16:
*
* The minimum value which can be held in a #gint16.
*
* Since: 2.4
*/
/**
* G_MAXINT16:
*
* The maximum value which can be held in a #gint16.
*
* Since: 2.4
*/
/**
* G_GINT16_MODIFIER:
*
* The platform dependent length modifier for conversion specifiers
* for scanning and printing values of type #gint16 or #guint16. It
* is a string literal, but doesn't include the percent-sign, such
* that you can add precision and length modifiers between percent-sign
* and conversion specifier and append a conversion specifier.
*
* The following example prints "0x7b";
* |[<!-- language="C" -->
* gint16 value = 123;
* g_print ("%#" G_GINT16_MODIFIER "x", value);
* ]|
*
* Since: 2.4
*/
/**
* G_GINT16_FORMAT:
*
* This is the platform dependent conversion specifier for scanning and
* printing values of type #gint16. It is a string literal, but doesn't
* include the percent-sign, such that you can add precision and length
* modifiers between percent-sign and conversion specifier.
*
* |[<!-- language="C" -->
* gint16 in;
* gint32 out;
* sscanf ("42", "%" G_GINT16_FORMAT, &in)
* out = in * 1000;
* g_print ("%" G_GINT32_FORMAT, out);
* ]|
*/
/**
* guint16:
*
* An unsigned integer guaranteed to be 16 bits on all platforms.
* Values of this type can range from 0 to #G_MAXUINT16 (= 65,535).
*
* To print or scan values of this type, use
* %G_GINT16_MODIFIER and/or %G_GUINT16_FORMAT.
*/
/**
* G_MAXUINT16:
*
* The maximum value which can be held in a #guint16.
*
* Since: 2.4
*/
/**
* G_GUINT16_FORMAT:
*
* This is the platform dependent conversion specifier for scanning
* and printing values of type #guint16. See also #G_GINT16_FORMAT
*/
/**
* gint32:
*
* A signed integer guaranteed to be 32 bits on all platforms.
* Values of this type can range from #G_MININT32 (= -2,147,483,648)
* to #G_MAXINT32 (= 2,147,483,647).
*
* To print or scan values of this type, use
* %G_GINT32_MODIFIER and/or %G_GINT32_FORMAT.
*/
/**
* G_MININT32:
*
* The minimum value which can be held in a #gint32.
*
* Since: 2.4
*/
/**
* G_MAXINT32:
*
* The maximum value which can be held in a #gint32.
*
* Since: 2.4
*/
/**
* G_GINT32_MODIFIER:
*
* The platform dependent length modifier for conversion specifiers
* for scanning and printing values of type #gint32 or #guint32. It
* is a string literal. See also #G_GINT16_MODIFIER.
*
* Since: 2.4
*/
/**
* G_GINT32_FORMAT:
*
* This is the platform dependent conversion specifier for scanning
* and printing values of type #gint32. See also #G_GINT16_FORMAT.
*/
/**
* guint32:
*
* An unsigned integer guaranteed to be 32 bits on all platforms.
* Values of this type can range from 0 to #G_MAXUINT32 (= 4,294,967,295).
*
* To print or scan values of this type, use
* %G_GINT32_MODIFIER and/or %G_GUINT32_FORMAT.
*/
/**
* G_MAXUINT32:
*
* The maximum value which can be held in a #guint32.
*
* Since: 2.4
*/
/**
* G_GUINT32_FORMAT:
*
* This is the platform dependent conversion specifier for scanning
* and printing values of type #guint32. See also #G_GINT16_FORMAT.
*/
/**
* gint64:
*
* A signed integer guaranteed to be 64 bits on all platforms.
* Values of this type can range from #G_MININT64
* (= -9,223,372,036,854,775,808) to #G_MAXINT64
* (= 9,223,372,036,854,775,807).
*
* To print or scan values of this type, use
* %G_GINT64_MODIFIER and/or %G_GINT64_FORMAT.
*/
/**
* G_MININT64:
*
* The minimum value which can be held in a #gint64.
*/
/**
* G_MAXINT64:
*
* The maximum value which can be held in a #gint64.
*/
/**
* G_GINT64_MODIFIER:
*
* The platform dependent length modifier for conversion specifiers
* for scanning and printing values of type #gint64 or #guint64.
* It is a string literal.
*
* Some platforms do not support printing 64-bit integers, even
* though the types are supported. On such platforms %G_GINT64_MODIFIER
* is not defined.
*
* Since: 2.4
*/
/**
* G_GINT64_FORMAT:
*
* This is the platform dependent conversion specifier for scanning
* and printing values of type #gint64. See also #G_GINT16_FORMAT.
*
* Some platforms do not support scanning and printing 64-bit integers,
* even though the types are supported. On such platforms %G_GINT64_FORMAT
* is not defined. Note that scanf() may not support 64-bit integers, even
* if %G_GINT64_FORMAT is defined. Due to its weak error handling, scanf()
* is not recommended for parsing anyway; consider using g_ascii_strtoull()
* instead.
*/
/**
* guint64:
*
* An unsigned integer guaranteed to be 64-bits on all platforms.
* Values of this type can range from 0 to #G_MAXUINT64
* (= 18,446,744,073,709,551,615).
*
* To print or scan values of this type, use
* %G_GINT64_MODIFIER and/or %G_GUINT64_FORMAT.
*/
/**
* G_MAXUINT64:
*
* The maximum value which can be held in a #guint64.
*/
/**
* G_GUINT64_FORMAT:
*
* This is the platform dependent conversion specifier for scanning
* and printing values of type #guint64. See also #G_GINT16_FORMAT.
*
* Some platforms do not support scanning and printing 64-bit integers,
* even though the types are supported. On such platforms %G_GUINT64_FORMAT
* is not defined. Note that scanf() may not support 64-bit integers, even
* if %G_GINT64_FORMAT is defined. Due to its weak error handling, scanf()
* is not recommended for parsing anyway; consider using g_ascii_strtoull()
* instead.
*/
/**
* G_GINT64_CONSTANT:
* @val: a literal integer value, e.g. 0x1d636b02300a7aa7
*
* This macro is used to insert 64-bit integer literals
* into the source code.
*/
/**
* G_GUINT64_CONSTANT:
* @val: a literal integer value, e.g. 0x1d636b02300a7aa7U
*
* This macro is used to insert 64-bit unsigned integer
* literals into the source code.
*
* Since: 2.10
*/
/**
* gfloat:
*
* Corresponds to the standard C float type.
* Values of this type can range from -#G_MAXFLOAT to #G_MAXFLOAT.
*/
/**
* G_MINFLOAT:
*
* The minimum positive value which can be held in a #gfloat.
*
* If you are interested in the smallest value which can be held
* in a #gfloat, use -%G_MAXFLOAT.
*/
/**
* G_MAXFLOAT:
*
* The maximum value which can be held in a #gfloat.
*/
/**
* gdouble:
*
* Corresponds to the standard C double type.
* Values of this type can range from -#G_MAXDOUBLE to #G_MAXDOUBLE.
*/
/**
* G_MINDOUBLE:
*
* The minimum positive value which can be held in a #gdouble.
*
* If you are interested in the smallest value which can be held
* in a #gdouble, use -%G_MAXDOUBLE.
*/
/**
* G_MAXDOUBLE:
*
* The maximum value which can be held in a #gdouble.
*/
/**
* gsize:
*
* An unsigned integer type of the result of the sizeof operator,
* corresponding to the size_t type defined in C99.
* This type is wide enough to hold the numeric value of a pointer,
* so it is usually 32 bit wide on a 32-bit platform and 64 bit wide
* on a 64-bit platform. Values of this type can range from 0 to
* #G_MAXSIZE.
*
* To print or scan values of this type, use
* %G_GSIZE_MODIFIER and/or %G_GSIZE_FORMAT.
*/
/**
* G_MAXSIZE:
*
* The maximum value which can be held in a #gsize.
*
* Since: 2.4
*/
/**
* G_GSIZE_MODIFIER:
*
* The platform dependent length modifier for conversion specifiers
* for scanning and printing values of type #gsize or #gssize. It
* is a string literal.
*
* Since: 2.6
*/
/**
* G_GSIZE_FORMAT:
*
* This is the platform dependent conversion specifier for scanning
* and printing values of type #gsize. See also #G_GINT16_FORMAT.
*
* Since: 2.6
*/
/**
* gssize:
*
* A signed variant of #gsize, corresponding to the
* ssize_t defined on most platforms.
* Values of this type can range from #G_MINSSIZE
* to #G_MAXSSIZE.
*
* To print or scan values of this type, use
* %G_GSIZE_MODIFIER and/or %G_GSSIZE_FORMAT.
*/
/**
* G_MINSSIZE:
*
* The minimum value which can be held in a #gssize.
*
* Since: 2.14
*/
/**
* G_MAXSSIZE:
*
* The maximum value which can be held in a #gssize.
*
* Since: 2.14
*/
/**
* G_GSSIZE_FORMAT:
*
* This is the platform dependent conversion specifier for scanning
* and printing values of type #gssize. See also #G_GINT16_FORMAT.
*
* Since: 2.6
*/
/**
* goffset:
*
* A signed integer type that is used for file offsets,
* corresponding to the C99 type off64_t.
* Values of this type can range from #G_MINOFFSET to
* #G_MAXOFFSET.
*
* To print or scan values of this type, use
* %G_GOFFSET_MODIFIER and/or %G_GOFFSET_FORMAT.
*
* Since: 2.14
*/
/**
* G_MINOFFSET:
*
* The minimum value which can be held in a #goffset.
*/
/**
* G_MAXOFFSET:
*
* The maximum value which can be held in a #goffset.
*/
/**
* G_GOFFSET_MODIFIER:
*
* The platform dependent length modifier for conversion specifiers
* for scanning and printing values of type #goffset. It is a string
* literal. See also #G_GINT64_MODIFIER.
*
* Since: 2.20
*/
/**
* G_GOFFSET_FORMAT:
*
* This is the platform dependent conversion specifier for scanning
* and printing values of type #goffset. See also #G_GINT64_FORMAT.
*
* Since: 2.20
*/
/**
* G_GOFFSET_CONSTANT:
* @val: a literal integer value, e.g. 0x1d636b02300a7aa7
*
* This macro is used to insert #goffset 64-bit integer literals
* into the source code.
*
* See also #G_GINT64_CONSTANT.
*
* Since: 2.20
*/
/**
* gintptr:
*
* Corresponds to the C99 type intptr_t,
* a signed integer type that can hold any pointer.
*
* To print or scan values of this type, use
* %G_GINTPTR_MODIFIER and/or %G_GINTPTR_FORMAT.
*
* Since: 2.18
*/
/**
* G_GINTPTR_MODIFIER:
*
* The platform dependent length modifier for conversion specifiers
* for scanning and printing values of type #gintptr or #guintptr.
* It is a string literal.
*
* Since: 2.22
*/
/**
* G_GINTPTR_FORMAT:
*
* This is the platform dependent conversion specifier for scanning
* and printing values of type #gintptr.
*
* Since: 2.22
*/
/**
* guintptr:
*
* Corresponds to the C99 type uintptr_t,
* an unsigned integer type that can hold any pointer.
*
* To print or scan values of this type, use
* %G_GINTPTR_MODIFIER and/or %G_GUINTPTR_FORMAT.
*
* Since: 2.18
*/
/**
* G_GUINTPTR_FORMAT:
*
* This is the platform dependent conversion specifier
* for scanning and printing values of type #guintptr.
*
* Since: 2.22
*/
/* Type conversion {{{1 */
/**
* SECTION:type_conversion
* @title: Type Conversion Macros
* @short_description: portably storing integers in pointer variables
*
* Many times GLib, GTK+, and other libraries allow you to pass "user
* data" to a callback, in the form of a void pointer. From time to time
* you want to pass an integer instead of a pointer. You could allocate
* an integer, with something like:
* |[<!-- language="C" -->
* int *ip = g_new (int, 1);
* *ip = 42;
* ]|
* But this is inconvenient, and it's annoying to have to free the
* memory at some later time.
*
* Pointers are always at least 32 bits in size (on all platforms GLib
* intends to support). Thus you can store at least 32-bit integer values
* in a pointer value. Naively, you might try this, but it's incorrect:
* |[<!-- language="C" -->
* gpointer p;
* int i;
* p = (void*) 42;
* i = (int) p;
* ]|
* Again, that example was not correct, don't copy it.
* The problem is that on some systems you need to do this:
* |[<!-- language="C" -->
* gpointer p;
* int i;
* p = (void*) (long) 42;
* i = (int) (long) p;
* ]|
* The GLib macros GPOINTER_TO_INT(), GINT_TO_POINTER(), etc. take care
* to do the right thing on the every platform.
*
* Warning: You may not store pointers in integers. This is not
* portable in any way, shape or form. These macros only allow storing
* integers in pointers, and only preserve 32 bits of the integer; values
* outside the range of a 32-bit integer will be mangled.
*/
/**
* GINT_TO_POINTER:
* @i: integer to stuff into a pointer
*
* Stuffs an integer into a pointer type.
*
* Remember, you may not store pointers in integers. This is not portable
* in any way, shape or form. These macros only allow storing integers in
* pointers, and only preserve 32 bits of the integer; values outside the
* range of a 32-bit integer will be mangled.
*/
/**
* GPOINTER_TO_INT:
* @p: pointer containing an integer
*
* Extracts an integer from a pointer. The integer must have
* been stored in the pointer with GINT_TO_POINTER().
*
* Remember, you may not store pointers in integers. This is not portable
* in any way, shape or form. These macros only allow storing integers in
* pointers, and only preserve 32 bits of the integer; values outside the
* range of a 32-bit integer will be mangled.
*/
/**
* GUINT_TO_POINTER:
* @u: unsigned integer to stuff into the pointer
*
* Stuffs an unsigned integer into a pointer type.
*/
/**
* GPOINTER_TO_UINT:
* @p: pointer to extract an unsigned integer from
*
* Extracts an unsigned integer from a pointer. The integer must have
* been stored in the pointer with GUINT_TO_POINTER().
*/
/**
* GSIZE_TO_POINTER:
* @s: #gsize to stuff into the pointer
*
* Stuffs a #gsize into a pointer type.
*/
/**
* GPOINTER_TO_SIZE:
* @p: pointer to extract a #gsize from
*
* Extracts a #gsize from a pointer. The #gsize must have
* been stored in the pointer with GSIZE_TO_POINTER().
*/
/* Byte order {{{1 */
/**
* SECTION:byte_order
* @title: Byte Order Macros
* @short_description: a portable way to convert between different byte orders
*
* These macros provide a portable way to determine the host byte order
* and to convert values between different byte orders.
*
* The byte order is the order in which bytes are stored to create larger
* data types such as the #gint and #glong values.
* The host byte order is the byte order used on the current machine.
*
* Some processors store the most significant bytes (i.e. the bytes that
* hold the largest part of the value) first. These are known as big-endian
* processors. Other processors (notably the x86 family) store the most
* significant byte last. These are known as little-endian processors.
*
* Finally, to complicate matters, some other processors store the bytes in
* a rather curious order known as PDP-endian. For a 4-byte word, the 3rd
* most significant byte is stored first, then the 4th, then the 1st and
* finally the 2nd.
*
* Obviously there is a problem when these different processors communicate
* with each other, for example over networks or by using binary file formats.
* This is where these macros come in. They are typically used to convert
* values into a byte order which has been agreed on for use when
* communicating between different processors. The Internet uses what is
* known as 'network byte order' as the standard byte order (which is in
* fact the big-endian byte order).
*
* Note that the byte order conversion macros may evaluate their arguments
* multiple times, thus you should not use them with arguments which have
* side-effects.
*/
/**
* G_BYTE_ORDER:
*
* The host byte order.
* This can be either #G_LITTLE_ENDIAN or #G_BIG_ENDIAN (support for
* #G_PDP_ENDIAN may be added in future.)
*/
/**
* G_LITTLE_ENDIAN:
*
* Specifies one of the possible types of byte order.
* See #G_BYTE_ORDER.
*/
/**
* G_BIG_ENDIAN:
*
* Specifies one of the possible types of byte order.
* See #G_BYTE_ORDER.
*/
/**
* G_PDP_ENDIAN:
*
* Specifies one of the possible types of byte order
* (currently unused). See #G_BYTE_ORDER.
*/
/**
* g_htonl:
* @val: a 32-bit integer value in host byte order
*
* Converts a 32-bit integer value from host to network byte order.
*
* Returns: @val converted to network byte order
*/
/**
* g_htons:
* @val: a 16-bit integer value in host byte order
*
* Converts a 16-bit integer value from host to network byte order.
*
* Returns: @val converted to network byte order
*/
/**
* g_ntohl:
* @val: a 32-bit integer value in network byte order
*
* Converts a 32-bit integer value from network to host byte order.
*
* Returns: @val converted to host byte order.
*/
/**
* g_ntohs:
* @val: a 16-bit integer value in network byte order
*
* Converts a 16-bit integer value from network to host byte order.
*
* Returns: @val converted to host byte order
*/
/**
* GINT_FROM_BE:
* @val: a #gint value in big-endian byte order
*
* Converts a #gint value from big-endian to host byte order.
*
* Returns: @val converted to host byte order
*/
/**
* GINT_FROM_LE:
* @val: a #gint value in little-endian byte order
*
* Converts a #gint value from little-endian to host byte order.
*
* Returns: @val converted to host byte order
*/
/**
* GINT_TO_BE:
* @val: a #gint value in host byte order
*
* Converts a #gint value from host byte order to big-endian.
*
* Returns: @val converted to big-endian byte order
*/
/**
* GINT_TO_LE:
* @val: a #gint value in host byte order
*
* Converts a #gint value from host byte order to little-endian.
*
* Returns: @val converted to little-endian byte order
*/
/**
* GUINT_FROM_BE:
* @val: a #guint value in big-endian byte order
*
* Converts a #guint value from big-endian to host byte order.
*
* Returns: @val converted to host byte order
*/
/**
* GUINT_FROM_LE:
* @val: a #guint value in little-endian byte order
*
* Converts a #guint value from little-endian to host byte order.
*
* Returns: @val converted to host byte order
*/
/**
* GUINT_TO_BE:
* @val: a #guint value in host byte order
*
* Converts a #guint value from host byte order to big-endian.
*
* Returns: @val converted to big-endian byte order
*/
/**
* GUINT_TO_LE:
* @val: a #guint value in host byte order
*
* Converts a #guint value from host byte order to little-endian.
*
* Returns: @val converted to little-endian byte order.
*/
/**
* GLONG_FROM_BE:
* @val: a #glong value in big-endian byte order
*
* Converts a #glong value from big-endian to the host byte order.
*
* Returns: @val converted to host byte order
*/
/**
* GLONG_FROM_LE:
* @val: a #glong value in little-endian byte order
*
* Converts a #glong value from little-endian to host byte order.
*
* Returns: @val converted to host byte order
*/
/**
* GLONG_TO_BE:
* @val: a #glong value in host byte order
*
* Converts a #glong value from host byte order to big-endian.
*
* Returns: @val converted to big-endian byte order
*/
/**
* GLONG_TO_LE:
* @val: a #glong value in host byte order
*
* Converts a #glong value from host byte order to little-endian.
*
* Returns: @val converted to little-endian
*/
/**
* GULONG_FROM_BE:
* @val: a #gulong value in big-endian byte order
*
* Converts a #gulong value from big-endian to host byte order.
*
* Returns: @val converted to host byte order
*/
/**
* GULONG_FROM_LE:
* @val: a #gulong value in little-endian byte order
*
* Converts a #gulong value from little-endian to host byte order.
*
* Returns: @val converted to host byte order
*/
/**
* GULONG_TO_BE:
* @val: a #gulong value in host byte order
*
* Converts a #gulong value from host byte order to big-endian.
*
* Returns: @val converted to big-endian
*/
/**
* GULONG_TO_LE:
* @val: a #gulong value in host byte order
*
* Converts a #gulong value from host byte order to little-endian.
*
* Returns: @val converted to little-endian
*/
/**
* GSIZE_FROM_BE:
* @val: a #gsize value in big-endian byte order
*
* Converts a #gsize value from big-endian to the host byte order.
*
* Returns: @val converted to host byte order
*/
/**
* GSIZE_FROM_LE:
* @val: a #gsize value in little-endian byte order
*
* Converts a #gsize value from little-endian to host byte order.
*
* Returns: @val converted to host byte order
*/
/**
* GSIZE_TO_BE:
* @val: a #gsize value in host byte order
*
* Converts a #gsize value from host byte order to big-endian.
*
* Returns: @val converted to big-endian byte order
*/
/**
* GSIZE_TO_LE:
* @val: a #gsize value in host byte order
*
* Converts a #gsize value from host byte order to little-endian.
*
* Returns: @val converted to little-endian
*/
/**
* GSSIZE_FROM_BE:
* @val: a #gssize value in big-endian byte order
*
* Converts a #gssize value from big-endian to host byte order.
*
* Returns: @val converted to host byte order
*/
/**
* GSSIZE_FROM_LE:
* @val: a #gssize value in little-endian byte order
*
* Converts a #gssize value from little-endian to host byte order.
*
* Returns: @val converted to host byte order
*/
/**
* GSSIZE_TO_BE:
* @val: a #gssize value in host byte order
*
* Converts a #gssize value from host byte order to big-endian.
*
* Returns: @val converted to big-endian
*/
/**
* GSSIZE_TO_LE:
* @val: a #gssize value in host byte order
*
* Converts a #gssize value from host byte order to little-endian.
*
* Returns: @val converted to little-endian
*/
/**
* GINT16_FROM_BE:
* @val: a #gint16 value in big-endian byte order
*
* Converts a #gint16 value from big-endian to host byte order.
*
* Returns: @val converted to host byte order
*/
/**
* GINT16_FROM_LE:
* @val: a #gint16 value in little-endian byte order
*
* Converts a #gint16 value from little-endian to host byte order.
*
* Returns: @val converted to host byte order
*/
/**
* GINT16_TO_BE:
* @val: a #gint16 value in host byte order
*
* Converts a #gint16 value from host byte order to big-endian.
*
* Returns: @val converted to big-endian
*/
/**
* GINT16_TO_LE:
* @val: a #gint16 value in host byte order
*
* Converts a #gint16 value from host byte order to little-endian.
*
* Returns: @val converted to little-endian
*/
/**
* GUINT16_FROM_BE:
* @val: a #guint16 value in big-endian byte order
*
* Converts a #guint16 value from big-endian to host byte order.
*
* Returns: @val converted to host byte order
*/
/**
* GUINT16_FROM_LE:
* @val: a #guint16 value in little-endian byte order
*
* Converts a #guint16 value from little-endian to host byte order.
*
* Returns: @val converted to host byte order
*/
/**
* GUINT16_TO_BE:
* @val: a #guint16 value in host byte order
*
* Converts a #guint16 value from host byte order to big-endian.
*
* Returns: @val converted to big-endian
*/
/**
* GUINT16_TO_LE:
* @val: a #guint16 value in host byte order
*
* Converts a #guint16 value from host byte order to little-endian.
*
* Returns: @val converted to little-endian
*/
/**
* GINT32_FROM_BE:
* @val: a #gint32 value in big-endian byte order
*
* Converts a #gint32 value from big-endian to host byte order.
*
* Returns: @val converted to host byte order
*/
/**
* GINT32_FROM_LE:
* @val: a #gint32 value in little-endian byte order
*
* Converts a #gint32 value from little-endian to host byte order.
*
* Returns: @val converted to host byte order
*/
/**
* GINT32_TO_BE:
* @val: a #gint32 value in host byte order
*
* Converts a #gint32 value from host byte order to big-endian.
*
* Returns: @val converted to big-endian
*/
/**
* GINT32_TO_LE:
* @val: a #gint32 value in host byte order
*
* Converts a #gint32 value from host byte order to little-endian.
*
* Returns: @val converted to little-endian
*/
/**
* GUINT32_FROM_BE:
* @val: a #guint32 value in big-endian byte order
*
* Converts a #guint32 value from big-endian to host byte order.
*
* Returns: @val converted to host byte order
*/
/**
* GUINT32_FROM_LE:
* @val: a #guint32 value in little-endian byte order
*
* Converts a #guint32 value from little-endian to host byte order.
*
* Returns: @val converted to host byte order
*/
/**
* GUINT32_TO_BE:
* @val: a #guint32 value in host byte order
*
* Converts a #guint32 value from host byte order to big-endian.
*
* Returns: @val converted to big-endian
*/
/**
* GUINT32_TO_LE:
* @val: a #guint32 value in host byte order
*
* Converts a #guint32 value from host byte order to little-endian.
*
* Returns: @val converted to little-endian
*/
/**
* GINT64_FROM_BE:
* @val: a #gint64 value in big-endian byte order
*
* Converts a #gint64 value from big-endian to host byte order.
*
* Returns: @val converted to host byte order
*/
/**
* GINT64_FROM_LE:
* @val: a #gint64 value in little-endian byte order
*
* Converts a #gint64 value from little-endian to host byte order.
*
* Returns: @val converted to host byte order
*/
/**
* GINT64_TO_BE:
* @val: a #gint64 value in host byte order
*
* Converts a #gint64 value from host byte order to big-endian.
*
* Returns: @val converted to big-endian
*/
/**
* GINT64_TO_LE:
* @val: a #gint64 value in host byte order
*
* Converts a #gint64 value from host byte order to little-endian.
*
* Returns: @val converted to little-endian
*/
/**
* GUINT64_FROM_BE:
* @val: a #guint64 value in big-endian byte order
*
* Converts a #guint64 value from big-endian to host byte order.
*
* Returns: @val converted to host byte order
*/
/**
* GUINT64_FROM_LE:
* @val: a #guint64 value in little-endian byte order
*
* Converts a #guint64 value from little-endian to host byte order.
*
* Returns: @val converted to host byte order
*/
/**
* GUINT64_TO_BE:
* @val: a #guint64 value in host byte order
*
* Converts a #guint64 value from host byte order to big-endian.
*
* Returns: @val converted to big-endian
*/
/**
* GUINT64_TO_LE:
* @val: a #guint64 value in host byte order
*
* Converts a #guint64 value from host byte order to little-endian.
*
* Returns: @val converted to little-endian
*/
/**
* GUINT16_SWAP_BE_PDP:
* @val: a #guint16 value in big-endian or pdp-endian byte order
*
* Converts a #guint16 value between big-endian and pdp-endian byte order.
* The conversion is symmetric so it can be used both ways.
*
* Returns: @val converted to the opposite byte order
*/
/**
* GUINT16_SWAP_LE_BE:
* @val: a #guint16 value in little-endian or big-endian byte order
*
* Converts a #guint16 value between little-endian and big-endian byte order.
* The conversion is symmetric so it can be used both ways.
*
* Returns: @val converted to the opposite byte order
*/
/**
* GUINT16_SWAP_LE_PDP:
* @val: a #guint16 value in little-endian or pdp-endian byte order
*
* Converts a #guint16 value between little-endian and pdp-endian byte order.
* The conversion is symmetric so it can be used both ways.
*
* Returns: @val converted to the opposite byte order
*/
/**
* GUINT32_SWAP_BE_PDP:
* @val: a #guint32 value in big-endian or pdp-endian byte order
*
* Converts a #guint32 value between big-endian and pdp-endian byte order.
* The conversion is symmetric so it can be used both ways.
*
* Returns: @val converted to the opposite byte order
*/
/**
* GUINT32_SWAP_LE_BE:
* @val: a #guint32 value in little-endian or big-endian byte order
*
* Converts a #guint32 value between little-endian and big-endian byte order.
* The conversion is symmetric so it can be used both ways.
*
* Returns: @val converted to the opposite byte order
*/
/**
* GUINT32_SWAP_LE_PDP:
* @val: a #guint32 value in little-endian or pdp-endian byte order
*
* Converts a #guint32 value between little-endian and pdp-endian byte order.
* The conversion is symmetric so it can be used both ways.
*
* Returns: @val converted to the opposite byte order
*/
/**
* GUINT64_SWAP_LE_BE:
* @val: a #guint64 value in little-endian or big-endian byte order
*
* Converts a #guint64 value between little-endian and big-endian byte order.
* The conversion is symmetric so it can be used both ways.
*
* Returns: @val converted to the opposite byte order
*/
/* Numerical Definitions {{{1 */
/**
* SECTION:numerical
* @title: Numerical Definitions
* @short_description: mathematical constants, and floating point decomposition
*
* GLib offers mathematical constants such as #G_PI for the value of pi;
* many platforms have these in the C library, but some don't, the GLib
* versions always exist.
*
* The #GFloatIEEE754 and #GDoubleIEEE754 unions are used to access the
* sign, mantissa and exponent of IEEE floats and doubles. These unions are
* defined as appropriate for a given platform. IEEE floats and doubles are
* supported (used for storage) by at least Intel, PPC and Sparc. See
* [IEEE 754-2008](http://en.wikipedia.org/wiki/IEEE_float)
* for more information about IEEE number formats.
*/
/**
* G_IEEE754_FLOAT_BIAS:
*
* The bias by which exponents in single-precision floats are offset.
*/
/**
* G_IEEE754_DOUBLE_BIAS:
*
* The bias by which exponents in double-precision floats are offset.
*/
/**
* GFloatIEEE754:
* @v_float: the double value
*
* The #GFloatIEEE754 and #GDoubleIEEE754 unions are used to access the sign,
* mantissa and exponent of IEEE floats and doubles. These unions are defined
* as appropriate for a given platform. IEEE floats and doubles are supported
* (used for storage) by at least Intel, PPC and Sparc.
*/
/**
* GDoubleIEEE754:
* @v_double: the double value
*
* The #GFloatIEEE754 and #GDoubleIEEE754 unions are used to access the sign,
* mantissa and exponent of IEEE floats and doubles. These unions are defined
* as appropriate for a given platform. IEEE floats and doubles are supported
* (used for storage) by at least Intel, PPC and Sparc.
*/
/**
* G_E:
*
* The base of natural logarithms.
*/
/**
* G_LN2:
*
* The natural logarithm of 2.
*/
/**
* G_LN10:
*
* The natural logarithm of 10.
*/
/**
* G_PI:
*
* The value of pi (ratio of circle's circumference to its diameter).
*/
/**
* G_PI_2:
*
* Pi divided by 2.
*/
/**
* G_PI_4:
*
* Pi divided by 4.
*/
/**
* G_SQRT2:
*
* The square root of two.
*/
/**
* G_LOG_2_BASE_10:
*
* Multiplying the base 2 exponent by this number yields the base 10 exponent.
*/
/* Macros {{{1 */
/**
* SECTION:macros
* @title: Standard Macros
* @short_description: commonly-used macros
*
* These macros provide a few commonly-used features.
*/
/**
* G_OS_WIN32:
*
* This macro is defined only on Windows. So you can bracket
* Windows-specific code in "\#ifdef G_OS_WIN32".
*/
/**
* G_OS_UNIX:
*
* This macro is defined only on UNIX. So you can bracket
* UNIX-specific code in "\#ifdef G_OS_UNIX".
*/
/**
* G_DIR_SEPARATOR:
*
* The directory separator character.
* This is '/' on UNIX machines and '\' under Windows.
*/
/**
* G_DIR_SEPARATOR_S:
*
* The directory separator as a string.
* This is "/" on UNIX machines and "\" under Windows.
*/
/**
* G_IS_DIR_SEPARATOR:
* @c: a character
*
* Checks whether a character is a directory
* separator. It returns %TRUE for '/' on UNIX
* machines and for '\' or '/' under Windows.
*
* Since: 2.6
*/
/**
* G_SEARCHPATH_SEPARATOR:
*
* The search path separator character.
* This is ':' on UNIX machines and ';' under Windows.
*/
/**
* G_SEARCHPATH_SEPARATOR_S:
*
* The search path separator as a string.
* This is ":" on UNIX machines and ";" under Windows.
*/
/**
* TRUE:
*
* Defines the %TRUE value for the #gboolean type.
*/
/**
* FALSE:
*
* Defines the %FALSE value for the #gboolean type.
*/
/**
* NULL:
*
* Defines the standard %NULL pointer.
*/
/**
* MIN:
* @a: a numeric value
* @b: a numeric value
*
* Calculates the minimum of @a and @b.
*
* Returns: the minimum of @a and @b.
*/
/**
* MAX:
* @a: a numeric value
* @b: a numeric value
*
* Calculates the maximum of @a and @b.
*
* Returns: the maximum of @a and @b.
*/
/**
* ABS:
* @a: a numeric value
*
* Calculates the absolute value of @a.
* The absolute value is simply the number with any negative sign taken away.
*
* For example,
* - ABS(-10) is 10.
* - ABS(10) is also 10.
*
* Returns: the absolute value of @a.
*/
/**
* CLAMP:
* @x: the value to clamp
* @low: the minimum value allowed
* @high: the maximum value allowed
*
* Ensures that @x is between the limits set by @low and @high. If @low is
* greater than @high the result is undefined.
*
* For example,
* - CLAMP(5, 10, 15) is 10.
* - CLAMP(15, 5, 10) is 10.
* - CLAMP(20, 15, 25) is 20.
*
* Returns: the value of @x clamped to the range between @low and @high
*/
/**
* G_STRUCT_MEMBER:
* @member_type: the type of the struct field
* @struct_p: a pointer to a struct
* @struct_offset: the offset of the field from the start of the struct,
* in bytes
*
* Returns a member of a structure at a given offset, using the given type.
*
* Returns: the struct member
*/
/**
* G_STRUCT_MEMBER_P:
* @struct_p: a pointer to a struct
* @struct_offset: the offset from the start of the struct, in bytes
*
* Returns an untyped pointer to a given offset of a struct.
*
* Returns: an untyped pointer to @struct_p plus @struct_offset bytes
*/
/**
* G_STRUCT_OFFSET:
* @struct_type: a structure type, e.g. #GtkWidget
* @member: a field in the structure, e.g. @window
*
* Returns the offset, in bytes, of a member of a struct.
*
* Returns: the offset of @member from the start of @struct_type
*/
/**
* G_CONST_RETURN:
*
* If %G_DISABLE_CONST_RETURNS is defined, this macro expands
* to nothing. By default, the macro expands to const. The macro
* can be used in place of const for functions that return a value
* that should not be modified. The purpose of this macro is to allow
* us to turn on const for returned constant strings by default, while
* allowing programmers who find that annoying to turn it off. This macro
* should only be used for return values and for "out" parameters, it
* doesn't make sense for "in" parameters.
*
* Deprecated: 2.30: API providers should replace all existing uses with
* const and API consumers should adjust their code accordingly
*/
/**
* G_N_ELEMENTS:
* @arr: the array
*
* Determines the number of elements in an array. The array must be
* declared so the compiler knows its size at compile-time; this
* macro will not work on an array allocated on the heap, only static
* arrays or arrays on the stack.
*/
/ * Miscellaneous Macros {{{1 */
/**
* SECTION:macros_misc
* @title: Miscellaneous Macros
* @short_description: specialized macros which are not used often
*
* These macros provide more specialized features which are not
* needed so often by application programmers.
*/
/**
* G_INLINE_FUNC:
*
* This macro is used to export function prototypes so they can be linked
* with an external version when no inlining is performed. The file which
* implements the functions should define %G_IMPLEMENTS_INLINES
* before including the headers which contain %G_INLINE_FUNC declarations.
* Since inlining is very compiler-dependent using these macros correctly
* is very difficult. Their use is strongly discouraged.
*
* This macro is often mistaken for a replacement for the inline keyword;
* inline is already declared in a portable manner in the GLib headers
* and can be used normally.
*/
/**
* G_STMT_START:
*
* Used within multi-statement macros so that they can be used in places
* where only one statement is expected by the compiler.
*/
/**
* G_STMT_END:
*
* Used within multi-statement macros so that they can be used in places
* where only one statement is expected by the compiler.
*/
/**
* G_BEGIN_DECLS:
*
* Used (along with #G_END_DECLS) to bracket header files. If the
* compiler in use is a C++ compiler, adds extern "C"
* around the header.
*/
/**
* G_END_DECLS:
*
* Used (along with #G_BEGIN_DECLS) to bracket header files. If the
* compiler in use is a C++ compiler, adds extern "C"
* around the header.
*/
/**
* G_VA_COPY:
* @ap1: the va_list variable to place a copy of @ap2 in
* @ap2: a va_list
*
* Portable way to copy va_list variables.
*
* In order to use this function, you must include string.h yourself,
* because this macro may use memmove() and GLib does not include
* string.h for you.
*/
/**
* G_STRINGIFY:
* @macro_or_string: a macro or a string
*
* Accepts a macro or a string and converts it into a string after
* preprocessor argument expansion. For example, the following code:
*
* |[<!-- language="C" -->
* #define AGE 27
* const gchar *greeting = G_STRINGIFY (AGE) " today!";
* ]|
*
* is transformed by the preprocessor into (code equivalent to):
*
* |[<!-- language="C" -->
* const gchar *greeting = "27 today!";
* ]|
*/
/**
* G_PASTE:
* @identifier1: an identifier
* @identifier2: an identifier
*
* Yields a new preprocessor pasted identifier
* @identifier1identifier2 from its expanded
* arguments @identifier1 and @identifier2. For example,
* the following code:
* |[<!-- language="C" -->
* #define GET(traveller,method) G_PASTE(traveller_get_, method) (traveller)
* const gchar *name = GET (traveller, name);
* const gchar *quest = GET (traveller, quest);
* GdkColor *favourite = GET (traveller, favourite_colour);
* ]|
*
* is transformed by the preprocessor into:
* |[<!-- language="C" -->
* const gchar *name = traveller_get_name (traveller);
* const gchar *quest = traveller_get_quest (traveller);
* GdkColor *favourite = traveller_get_favourite_colour (traveller);
* ]|
*
* Since: 2.20
*/
/**
* G_STATIC_ASSERT:
* @expr: a constant expression
*
* The G_STATIC_ASSERT() macro lets the programmer check
* a condition at compile time, the condition needs to
* be compile time computable. The macro can be used in
* any place where a typedef is valid.
*
* A typedef is generally allowed in exactly the same places that
* a variable declaration is allowed. For this reason, you should
* not use G_STATIC_ASSERT() in the middle of blocks of code.
*
* The macro should only be used once per source code line.
*
* Since: 2.20
*/
/**
* G_STATIC_ASSERT_EXPR:
* @expr: a constant expression
*
* The G_STATIC_ASSERT_EXPR() macro lets the programmer check
* a condition at compile time. The condition needs to be
* compile time computable.
*
* Unlike G_STATIC_ASSERT(), this macro evaluates to an expression
* and, as such, can be used in the middle of other expressions.
* Its value should be ignored. This can be accomplished by placing
* it as the first argument of a comma expression.
*
* |[<!-- language="C" -->
* #define ADD_ONE_TO_INT(x) \
* (G_STATIC_ASSERT_EXPR(sizeof (x) == sizeof (int)), ((x) + 1))
* ]|
*
* Since: 2.30
*/
/**
* G_GNUC_EXTENSION:
*
* Expands to __extension__ when gcc is used as the compiler. This simply
* tells gcc not to warn about the following non-standard code when compiling
* with the `-pedantic` option.
*/
/**
* G_GNUC_CONST:
*
* Expands to the GNU C const function attribute if the compiler is gcc.
* Declaring a function as const enables better optimization of calls to
* the function. A const function doesn't examine any values except its
* parameters, and has no effects except its return value.
*
* Place the attribute after the declaration, just before the semicolon.
*
* See the GNU C documentation for more details.
*
* A function that has pointer arguments and examines the data pointed to
* must not be declared const. Likewise, a function that calls a non-const
* function usually must not be const. It doesn't make sense for a const
* function to return void.
*/
/**
* G_GNUC_PURE:
*
* Expands to the GNU C pure function attribute if the compiler is gcc.
* Declaring a function as pure enables better optimization of calls to
* the function. A pure function has no effects except its return value
* and the return value depends only on the parameters and/or global
* variables.
*
* Place the attribute after the declaration, just before the semicolon.
*
* See the GNU C documentation for more details.
*/
/**
* G_GNUC_MALLOC:
*
* Expands to the GNU C malloc function attribute if the compiler is gcc.
* Declaring a function as malloc enables better optimization of the function.
* A function can have the malloc attribute if it returns a pointer which is
* guaranteed to not alias with any other pointer when the function returns
* (in practice, this means newly allocated memory).
*
* Place the attribute after the declaration, just before the semicolon.
*
* See the GNU C documentation for more details.
*
* Since: 2.6
*/
/**
* G_GNUC_ALLOC_SIZE:
* @x: the index of the argument specifying the allocation size
*
* Expands to the GNU C alloc_size function attribute if the compiler
* is a new enough gcc. This attribute tells the compiler that the
* function returns a pointer to memory of a size that is specified
* by the @xth function parameter.
*
* Place the attribute after the function declaration, just before the
* semicolon.
*
* See the GNU C documentation for more details.
*
* Since: 2.18
*/
/**
* G_GNUC_ALLOC_SIZE2:
* @x: the index of the argument specifying one factor of the allocation size
* @y: the index of the argument specifying the second factor of the allocation size
*
* Expands to the GNU C alloc_size function attribute if the compiler is a
* new enough gcc. This attribute tells the compiler that the function returns
* a pointer to memory of a size that is specified by the product of two
* function parameters.
*
* Place the attribute after the function declaration, just before the
* semicolon.
*
* See the GNU C documentation for more details.
*
* Since: 2.18
*/
/**
* G_GNUC_DEPRECATED:
*
* Expands to the GNU C deprecated attribute if the compiler is gcc.
* It can be used to mark typedefs, variables and functions as deprecated.
* When called with the `-Wdeprecated-declarations` option,
* gcc will generate warnings when deprecated interfaces are used.
*
* Place the attribute after the declaration, just before the semicolon.
*
* See the GNU C documentation for more details.
*
* Since: 2.2
*/
/**
* G_GNUC_DEPRECATED_FOR:
* @f: the intended replacement for the deprecated symbol,
* such as the name of a function
*
* Like %G_GNUC_DEPRECATED, but names the intended replacement for the
* deprecated symbol if the version of gcc in use is new enough to support
* custom deprecation messages.
*
* Place the attribute after the declaration, just before the semicolon.
*
* See the GNU C documentation for more details.
*
* Note that if @f is a macro, it will be expanded in the warning message.
* You can enclose it in quotes to prevent this. (The quotes will show up
* in the warning, but it's better than showing the macro expansion.)
*
* Since: 2.26
*/
/**
* G_GNUC_BEGIN_IGNORE_DEPRECATIONS:
*
* Tells gcc (if it is a new enough version) to temporarily stop emitting
* warnings when functions marked with %G_GNUC_DEPRECATED or
* %G_GNUC_DEPRECATED_FOR are called. This is useful for when you have
* one deprecated function calling another one, or when you still have
* regression tests for deprecated functions.
*
* Use %G_GNUC_END_IGNORE_DEPRECATIONS to begin warning again. (If you
* are not compiling with `-Wdeprecated-declarations` then neither macro
* has any effect.)
*
* This macro can be used either inside or outside of a function body,
* but must appear on a line by itself.
*
* Since: 2.32
*/
/**
* G_GNUC_END_IGNORE_DEPRECATIONS:
*
* Undoes the effect of %G_GNUC_BEGIN_IGNORE_DEPRECATIONS, telling
* gcc to begin outputting warnings again (assuming those warnings
* had been enabled to begin with).
*
* This macro can be used either inside or outside of a function body,
* but must appear on a line by itself.
*
* Since: 2.32
*/
/**
* G_DEPRECATED:
*
* This macro is similar to %G_GNUC_DEPRECATED, and can be used to mark
* functions declarations as deprecated. Unlike %G_GNUC_DEPRECATED, it is
* meant to be portable across different compilers and must be placed
* before the function declaration.
*
* Since: 2.32
*/
/**
* G_DEPRECATED_FOR:
* @f: the name of the function that this function was deprecated for
*
* This macro is similar to %G_GNUC_DEPRECATED_FOR, and can be used to mark
* functions declarations as deprecated. Unlike %G_GNUC_DEPRECATED_FOR, it
* is meant to be portable across different compilers and must be placed
* before the function declaration.
*
* Since: 2.32
*/
/**
* G_UNAVAILABLE:
* @maj: the major version that introduced the symbol
* @min: the minor version that introduced the symbol
*
* This macro can be used to mark a function declaration as unavailable.
* It must be placed before the function declaration. Use of a function
* that has been annotated with this macros will produce a compiler warning.
*
* Since: 2.32
*/
/**
* GLIB_DISABLE_DEPRECATION_WARNINGS:
*
* A macro that should be defined before including the glib.h header.
* If it is defined, no compiler warnings will be produced for uses
* of deprecated GLib APIs.
*/
/**
* G_GNUC_NORETURN:
*
* Expands to the GNU C noreturn function attribute if the compiler is gcc.
* It is used for declaring functions which never return. It enables
* optimization of the function, and avoids possible compiler warnings.
*
* Place the attribute after the declaration, just before the semicolon.
*
* See the GNU C documentation for more details.
*/
/**
* G_GNUC_UNUSED:
*
* Expands to the GNU C unused function attribute if the compiler is gcc.
* It is used for declaring functions and arguments which may never be used.
* It avoids possible compiler warnings.
*
* For functions, place the attribute after the declaration, just before the
* semicolon. For arguments, place the attribute at the beginning of the
* argument declaration.
*
* |[<!-- language="C" -->
* void my_unused_function (G_GNUC_UNUSED gint unused_argument,
* gint other_argument) G_GNUC_UNUSED;
* ]|
*
* See the GNU C documentation for more details.
*/
/**
* G_GNUC_PRINTF:
* @format_idx: the index of the argument corresponding to the
* format string (The arguments are numbered from 1)
* @arg_idx: the index of the first of the format arguments
*
* Expands to the GNU C format function attribute if the compiler is gcc.
* This is used for declaring functions which take a variable number of
* arguments, with the same syntax as printf(). It allows the compiler
* to type-check the arguments passed to the function.
*
* Place the attribute after the function declaration, just before the
* semicolon.
*
* See the GNU C documentation for more details.
*
* |[<!-- language="C" -->
* gint g_snprintf (gchar *string,
* gulong n,
* gchar const *format,
* ...) G_GNUC_PRINTF (3, 4);
* ]|
*/
/**
* G_GNUC_SCANF:
* @format_idx: the index of the argument corresponding to
* the format string (The arguments are numbered from 1)
* @arg_idx: the index of the first of the format arguments
*
* Expands to the GNU C format function attribute if the compiler is gcc.
* This is used for declaring functions which take a variable number of
* arguments, with the same syntax as scanf(). It allows the compiler
* to type-check the arguments passed to the function.
*
* See the GNU C documentation for details.
*/
/**
* G_GNUC_FORMAT:
* @arg_idx: the index of the argument
*
* Expands to the GNU C format_arg function attribute if the compiler
* is gcc. This function attribute specifies that a function takes a
* format string for a printf(), scanf(), strftime() or strfmon() style
* function and modifies it, so that the result can be passed to a printf(),
* scanf(), strftime() or strfmon() style function (with the remaining
* arguments to the format function the same as they would have been
* for the unmodified string).
*
* Place the attribute after the function declaration, just before the
* semicolon.
*
* See the GNU C documentation for more details.
*
* |[<!-- language="C" -->
* gchar *g_dgettext (gchar *domain_name, gchar *msgid) G_GNUC_FORMAT (2);
* ]|
*/
/**
* G_GNUC_NULL_TERMINATED:
*
* Expands to the GNU C sentinel function attribute if the compiler is gcc.
* This function attribute only applies to variadic functions and instructs
* the compiler to check that the argument list is terminated with an
* explicit %NULL.
*
* Place the attribute after the declaration, just before the semicolon.
*
* See the GNU C documentation for more details.
*
* Since: 2.8
*/
/**
* G_GNUC_WARN_UNUSED_RESULT:
*
* Expands to the GNU C warn_unused_result function attribute if the compiler
* is gcc. This function attribute makes the compiler emit a warning if the
* result of a function call is ignored.
*
* Place the attribute after the declaration, just before the semicolon.
*
* See the GNU C documentation for more details.
*
* Since: 2.10
*/
/**
* G_GNUC_FUNCTION:
*
* Expands to "" on all modern compilers, and to __FUNCTION__ on gcc
* version 2.x. Don't use it.
*
* Deprecated: 2.16: Use G_STRFUNC() instead
*/
/**
* G_GNUC_PRETTY_FUNCTION:
*
* Expands to "" on all modern compilers, and to __PRETTY_FUNCTION__
* on gcc version 2.x. Don't use it.
*
* Deprecated: 2.16: Use G_STRFUNC() instead
*/
/**
* G_GNUC_NO_INSTRUMENT:
*
* Expands to the GNU C no_instrument_function function attribute if the
* compiler is gcc. Functions with this attribute will not be instrumented
* for profiling, when the compiler is called with the
* `-finstrument-functions` option.
*
* Place the attribute after the declaration, just before the semicolon.
*
* See the GNU C documentation for more details.
*/
/**
* G_GNUC_INTERNAL:
*
* This attribute can be used for marking library functions as being used
* internally to the library only, which may allow the compiler to handle
* function calls more efficiently. Note that static functions do not need
* to be marked as internal in this way. See the GNU C documentation for
* details.
*
* When using a compiler that supports the GNU C hidden visibility attribute,
* this macro expands to __attribute__((visibility("hidden"))).
* When using the Sun Studio compiler, it expands to __hidden.
*
* Note that for portability, the attribute should be placed before the
* function declaration. While GCC allows the macro after the declaration,
* Sun Studio does not.
*
* |[<!-- language="C" -->
* G_GNUC_INTERNAL
* void _g_log_fallback_handler (const gchar *log_domain,
* GLogLevelFlags log_level,
* const gchar *message,
* gpointer unused_data);
* ]|
*
* Since: 2.6
*/
/**
* G_GNUC_MAY_ALIAS:
*
* Expands to the GNU C may_alias type attribute if the compiler is gcc.
* Types with this attribute will not be subjected to type-based alias
* analysis, but are assumed to alias with any other type, just like char.
*
* See the GNU C documentation for details.
*
* Since: 2.14
*/
/**
* G_LIKELY:
* @expr: the expression
*
* Hints the compiler that the expression is likely to evaluate to
* a true value. The compiler may use this information for optimizations.
*
* |[<!-- language="C" -->
* if (G_LIKELY (random () != 1))
* g_print ("not one");
* ]|
*
* Returns: the value of @expr
*
* Since: 2.2
*/
/**
* G_UNLIKELY:
* @expr: the expression
*
* Hints the compiler that the expression is unlikely to evaluate to
* a true value. The compiler may use this information for optimizations.
*
* |[<!-- language="C" -->
* if (G_UNLIKELY (random () == 1))
* g_print ("a random one");
* ]|
*
* Returns: the value of @expr
*
* Since: 2.2
*/
/**
* G_STRLOC:
*
* Expands to a string identifying the current code position.
*/
/**
* G_STRFUNC:
*
* Expands to a string identifying the current function.
*
* Since: 2.4
*/
/* Windows Compatibility Functions {{{1 */
/**
* SECTION:windows
* @title: Windows Compatibility Functions
* @short_description: UNIX emulation on Windows
*
* These functions provide some level of UNIX emulation on the
* Windows platform. If your application really needs the POSIX
* APIs, we suggest you try the Cygwin project.
*/
/**
* MAXPATHLEN:
*
* Provided for UNIX emulation on Windows; equivalent to UNIX
* macro %MAXPATHLEN, which is the maximum length of a filename
* (including full path).
*/
/**
* G_WIN32_DLLMAIN_FOR_DLL_NAME:
* @static: empty or "static"
* @dll_name: the name of the (pointer to the) char array where
* the DLL name will be stored. If this is used, you must also
* include `windows.h`. If you need a more complex DLL entry
* point function, you cannot use this
*
* On Windows, this macro defines a DllMain() function that stores
* the actual DLL name that the code being compiled will be included in.
*
* On non-Windows platforms, expands to nothing.
*/
/**
* G_WIN32_HAVE_WIDECHAR_API:
*
* On Windows, this macro defines an expression which evaluates to
* %TRUE if the code is running on a version of Windows where the wide
* character versions of the Win32 API functions, and the wide character
* versions of the C library functions work. (They are always present in
* the DLLs, but don't work on Windows 9x and Me.)
*
* On non-Windows platforms, it is not defined.
*
* Since: 2.6
*/
/**
* G_WIN32_IS_NT_BASED:
*
* On Windows, this macro defines an expression which evaluates to
* %TRUE if the code is running on an NT-based Windows operating system.
*
* On non-Windows platforms, it is not defined.
*
* Since: 2.6
*/
/* Epilogue {{{1 */
/* vim: set foldmethod=marker: */
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