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