mirror of
https://gitlab.gnome.org/GNOME/glib.git
synced 2024-10-29 18:46:48 +01:00
57 lines
1.8 KiB
Markdown
57 lines
1.8 KiB
Markdown
|
Title: Value Collection
|
|||
|
|
SPDX-License-Identifier: LGPL-2.1-or-later
|
|||
|
|
SPDX-FileCopyrightText: 2005 Matthias Clasen
|
|||
|
|
|
|||
|
|
# Value Collection
|
|||
|
|
|
|||
|
|
GLib provides a set of macros for the varargs parsing support needed
|
|||
|
|
in variadic GObject functions such as [ctor@GObject.Object.new] or
|
|||
|
|
[method@GObject.Object.set]
|
|||
|
|
|
|||
|
|
They currently support the collection of integral types, floating point
|
|||
|
|
types and pointers.
|
|||
|
|
|
|||
|
|
## Macros
|
|||
|
|
|
|||
|
|
`G_VALUE_COLLECT_INIT(value, _value_type, var_args, flags, __error)`
|
|||
|
|
|
|||
|
|
: Collects a variable argument value from a `va_list`.
|
|||
|
|
|
|||
|
|
We have to implement the varargs collection as a macro, because on some
|
|||
|
|
systems `va_list` variables cannot be passed by reference.
|
|||
|
|
|
|||
|
|
Since: 2.24
|
|||
|
|
|
|||
|
|
`G_VALUE_COLLECT_INIT2(value, g_vci_vtab, _value_type, var_args, flags, __error)`
|
|||
|
|
|
|||
|
|
: A variant of `G_VALUE_COLLECT_INIT` that provides the [struct@GObject.TypeValueTable]
|
|||
|
|
to the caller.
|
|||
|
|
|
|||
|
|
Since: 2.74
|
|||
|
|
|
|||
|
|
`G_VALUE_COLLECT(value, var_args, flags, __error)`
|
|||
|
|
|
|||
|
|
: Collects a variable argument value from a `va_list`.
|
|||
|
|
|
|||
|
|
We have to implement the varargs collection as a macro, because on some systems
|
|||
|
|
`va_list` variables cannot be passed by reference.
|
|||
|
|
|
|||
|
|
Note: If you are creating the `value argument` just before calling this macro,
|
|||
|
|
you should use the `G_VALUE_COLLECT_INIT` variant and pass the uninitialized
|
|||
|
|
`GValue`. That variant is faster than `G_VALUE_COLLECT`.
|
|||
|
|
|
|||
|
|
`G_VALUE_COLLECT_SKIP(_value_type, var_args)`
|
|||
|
|
|
|||
|
|
: Skip an argument of type `_value_type` from `var_args`.
|
|||
|
|
|
|||
|
|
`G_VALUE_LCOPY(value, var_args, flags, __error)`
|
|||
|
|
|
|||
|
|
: Stores a value’s value into one or more argument locations from a `va_list`.
|
|||
|
|
|
|||
|
|
This is the inverse of G_VALUE_COLLECT().
|
|||
|
|
|
|||
|
|
`G_VALUE_COLLECT_FORMAT_MAX_LENGTH`
|
|||
|
|
|
|||
|
|
: The maximal number of [type@GObject.TypeCValue]s which can be collected for a
|
|||
|
|
single `GValue`.
|