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<code class="function"><a class="link" href="gobject-Type-Information.html#g-type-register-static">g_type_register_static</a></code> and
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<code class="function"><a class="link" href="gobject-Type-Information.html#g-type-register-fundamental">g_type_register_fundamental</a></code>
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<code class="function"><a class="link" href="gobject-Type-Information.html#g-type-register-static" title="g_type_register_static ()">g_type_register_static</a></code> and
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<code class="function"><a class="link" href="gobject-Type-Information.html#g-type-register-fundamental" title="g_type_register_fundamental ()">g_type_register_fundamental</a></code>
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are the C functions, defined in
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<code class="filename">gtype.h</code> and implemented in <code class="filename">gtype.c</code>
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which you should use to register a new <span class="type"><a class="link" href="gobject-Type-Information.html#GType">GType</a></span> in the program's type system.
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which you should use to register a new <span class="type"><a class="link" href="gobject-Type-Information.html#GType" title="GType">GType</a></span> in the program's type system.
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It is not likely you will ever need to use
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<code class="function"><a class="link" href="gobject-Type-Information.html#g-type-register-fundamental">g_type_register_fundamental</a></code> (you have to be Tim Janik
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<code class="function"><a class="link" href="gobject-Type-Information.html#g-type-register-fundamental" title="g_type_register_fundamental ()">g_type_register_fundamental</a></code> (you have to be Tim Janik
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to do that) but in case you want to, the last chapter explains how to create
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new fundamental types.
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<sup>[<a name="id2809261" href="#ftn.id2809261" class="footnote">2</a>]</sup>
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<sup>[<a name="id3008332" href="#ftn.id3008332" class="footnote">2</a>]</sup>
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Fundamental types are top-level types which do not derive from any other type
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while other non-fundamental types derive from other types.
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Upon initialization by <code class="function"><a class="link" href="gobject-Type-Information.html#g-type-init">g_type_init</a></code>, the type system not
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Upon initialization by <code class="function"><a class="link" href="gobject-Type-Information.html#g-type-init" title="g_type_init ()">g_type_init</a></code>, the type system not
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only initializes its internal data structures but it also registers a number of core
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types: some of these are fundamental types. Others are types derived from these
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fundamental types.
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<div class="itemizedlist"><ul type="disc">
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class size: the class_size field in <span class="type"><a class="link" href="gobject-Type-Information.html#GTypeInfo">GTypeInfo</a></span>.
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class size: the class_size field in <span class="type"><a class="link" href="gobject-Type-Information.html#GTypeInfo" title="GTypeInfo">GTypeInfo</a></span>.
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class initialization functions (C++ constructor): the base_init and
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class_init fields in <span class="type"><a class="link" href="gobject-Type-Information.html#GTypeInfo">GTypeInfo</a></span>.
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class_init fields in <span class="type"><a class="link" href="gobject-Type-Information.html#GTypeInfo" title="GTypeInfo">GTypeInfo</a></span>.
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class destruction functions (C++ destructor): the base_finalize and
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class_finalize fields in <span class="type"><a class="link" href="gobject-Type-Information.html#GTypeInfo">GTypeInfo</a></span>.
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class_finalize fields in <span class="type"><a class="link" href="gobject-Type-Information.html#GTypeInfo" title="GTypeInfo">GTypeInfo</a></span>.
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instance size (C++ parameter to new): the instance_size field in
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<span class="type"><a class="link" href="gobject-Type-Information.html#GTypeInfo">GTypeInfo</a></span>.
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<span class="type"><a class="link" href="gobject-Type-Information.html#GTypeInfo" title="GTypeInfo">GTypeInfo</a></span>.
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instantiation policy (C++ type of new operator): the n_preallocs
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field in <span class="type"><a class="link" href="gobject-Type-Information.html#GTypeInfo">GTypeInfo</a></span>.
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field in <span class="type"><a class="link" href="gobject-Type-Information.html#GTypeInfo" title="GTypeInfo">GTypeInfo</a></span>.
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copy functions (C++ copy operators): the value_table field in
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<span class="type"><a class="link" href="gobject-Type-Information.html#GTypeInfo">GTypeInfo</a></span>.
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<span class="type"><a class="link" href="gobject-Type-Information.html#GTypeInfo" title="GTypeInfo">GTypeInfo</a></span>.
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type characteristic flags: <span class="type"><a class="link" href="gobject-Type-Information.html#GTypeFlags">GTypeFlags</a></span>.
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type characteristic flags: <span class="type"><a class="link" href="gobject-Type-Information.html#GTypeFlags" title="enum GTypeFlags">GTypeFlags</a></span>.
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Fundamental types are also defined by a set of <span class="type"><a class="link" href="gobject-Type-Information.html#GTypeFundamentalFlags">GTypeFundamentalFlags</a></span>
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which are stored in a <span class="type"><a class="link" href="gobject-Type-Information.html#GTypeFundamentalInfo">GTypeFundamentalInfo</a></span>.
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Fundamental types are also defined by a set of <span class="type"><a class="link" href="gobject-Type-Information.html#GTypeFundamentalFlags" title="enum GTypeFundamentalFlags">GTypeFundamentalFlags</a></span>
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which are stored in a <span class="type"><a class="link" href="gobject-Type-Information.html#GTypeFundamentalInfo" title="GTypeFundamentalInfo">GTypeFundamentalInfo</a></span>.
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Non-fundamental types are furthermore defined by the type of their parent which is
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passed as the parent_type parameter to <code class="function"><a class="link" href="gobject-Type-Information.html#g-type-register-static">g_type_register_static</a></code>
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and <code class="function"><a class="link" href="gobject-Type-Information.html#g-type-register-dynamic">g_type_register_dynamic</a></code>.
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passed as the parent_type parameter to <code class="function"><a class="link" href="gobject-Type-Information.html#g-type-register-static" title="g_type_register_static ()">g_type_register_static</a></code>
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and <code class="function"><a class="link" href="gobject-Type-Information.html#g-type-register-dynamic" title="g_type_register_dynamic ()">g_type_register_dynamic</a></code>.
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<div class="sect1" lang="en">
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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
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they can all be manipulated through a single API to copy/assign them.
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The <span class="type"><a class="link" href="gobject-Generic-values.html#GValue">GValue</a></span> structure is used as an abstract container for all of these
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The <span class="type"><a class="link" href="gobject-Generic-values.html#GValue" title="GValue">GValue</a></span> structure is used as an abstract container for all of these
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types. Its simplistic API (defined in <code class="filename">gobject/gvalue.h</code>) can be
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used to invoke the value_table functions registered
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during type registration: for example <code class="function"><a class="link" href="gobject-Generic-values.html#g-value-copy">g_value_copy</a></code> copies the
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content of a <span class="type"><a class="link" href="gobject-Generic-values.html#GValue">GValue</a></span> to another <span class="type"><a class="link" href="gobject-Generic-values.html#GValue">GValue</a></span>. This is similar
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during type registration: for example <code class="function"><a class="link" href="gobject-Generic-values.html#g-value-copy" title="g_value_copy ()">g_value_copy</a></code> copies the
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content of a <span class="type"><a class="link" href="gobject-Generic-values.html#GValue" title="GValue">GValue</a></span> to another <span class="type"><a class="link" href="gobject-Generic-values.html#GValue" title="GValue">GValue</a></span>. This is similar
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to a C++ assignment which invokes the C++ copy operator to modify the default
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bit-by-bit copy semantics of C++/C structures/classes.
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<div class="footnotes">
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<br><hr width="100" align="left">
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<div class="footnote"><p><sup>[<a name="ftn.id2809261" href="#id2809261" class="para">2</a>] </sup>
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<div class="footnote"><p><sup>[<a name="ftn.id3008332" href="#id3008332" class="para">2</a>] </sup>
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Please note that there exists another registration function: the
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<code class="function"><a class="link" href="gobject-Type-Information.html#g-type-register-dynamic">g_type_register_dynamic</a></code>. We will not discuss this
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<code class="function"><a class="link" href="gobject-Type-Information.html#g-type-register-dynamic" title="g_type_register_dynamic ()">g_type_register_dynamic</a></code>. We will not discuss this
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function here since its use is very similar to the <code class="function">_static</code>
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