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Abdelrahman Said
2026-06-28 13:49:01 +01:00
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<?xml version="1.0"?>
<!DOCTYPE section PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN"
"http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd" [
<!ENTITY igraph "igraph">
]>
<section id="igraph-PMT">
<title>About template types</title>
<para>
Some of the container types listed in this section are defined for
many base types. This is similar to templates in C++ and generics in
Ada, but it is implemented via preprocessor macros since the C language
cannot handle it. Here is the list of template types and the all base
types they currently support:
<glosslist>
<glossentry><glossterm>vector</glossterm><glossdef><para>
Vector is currently defined for <type>igraph_real_t</type>,
<type>igraph_int_t</type> (int), <type>char</type> (char),
<type>igraph_bool_t</type> (bool), <type>igraph_complex_t</type>
(complex) and and <type>void *</type> (ptr). The default is
<type>igraph_real_t</type>.
</para></glossdef></glossentry>
<glossentry><glossterm>matrix</glossterm><glossdef><para>
Matrix is currently defined for <type>igraph_real_t</type>,
<type>igraph_int_t</type> (int), <type>char</type> (char),
<type>igraph_bool_t</type> (bool) and <type>igraph_complex_t</type>
(complex). The default is <type>igraph_real_t</type>.
</para></glossdef></glossentry>
<glossentry><glossterm>array3</glossterm><glossdef><para>
Array3 is currently defined for <type>igraph_real_t</type>,
<type>igraph_int_t</type> (int), <type>char</type> (char) and
<type>igraph_bool_t</type> (bool). The default is
<type>igraph_real_t</type>.
</para></glossdef></glossentry>
<glossentry><glossterm>stack</glossterm><glossdef><para>
Stack is currently defined for <type>igraph_real_t</type>,
<type>igraph_int_t</type> (int), <type>char</type> (char) and
<type>igraph_bool_t</type> (bool).
The default is <type>igraph_real_t</type>.
</para></glossdef></glossentry>
<glossentry><glossterm>double-ended queue</glossterm><glossdef><para>
Dqueue is currently defined for <type>igraph_real_t</type>,
<type>igraph_int_t</type> (int), <type>char</type> (char) and
<type>igraph_bool_t</type> (bool). The default is
<type>igraph_real_t</type>.
</para></glossdef></glossentry>
<glossentry><glossterm>heap</glossterm><glossdef><para>
Heap is currently defined for <type>igraph_real_t</type>,
<type>igraph_int_t</type> (int), <type>char</type> (char).
In addition both maximum and minimum heaps are available.
The default is the <type>igraph_real_t</type> maximum heap.
</para></glossdef></glossentry>
<glossentry><glossterm>list of vectors</glossterm><glossdef><para>
Lists of vectors are currently defined for vectors holding
<type>igraph_real_t</type> and <type>igraph_int_t</type> (int).
The default is <type>igraph_real_t</type>.
</para></glossdef></glossentry>
<glossentry><glossterm>list of matrices</glossterm><glossdef><para>
Lists of matrices are currently defined for matrices holding
<type>igraph_real_t</type> only.
</para></glossdef></glossentry>
</glosslist>
</para>
<para>
The name of the base element (in parentheses) is added to the function
names, except for the default type.
</para>
<para>
Some examples:
<itemizedlist>
<listitem><para>
<type>igraph_vector_t</type> is a vector of
<type>igraph_real_t</type> elements. Its functions are
<function>igraph_vector_init</function>,
<function>igraph_vector_destroy</function>,
<function>igraph_vector_sort</function>, etc.
</para></listitem>
<listitem><para>
<type>igraph_vector_bool_t</type> is a vector of
<type>igraph_bool_t</type> elements; initialize it with
<function>igraph_vector_bool_init</function>, destroy it with
<function>igraph_vector_bool_destroy</function>, etc.
</para></listitem>
<listitem><para>
<type>igraph_heap_t</type> is a maximum heap with
<type>igraph_real_t</type> elements. The corresponding functions are
<function>igraph_heap_init</function>,
<function>igraph_heap_pop</function>, etc.
</para></listitem>
<listitem><para>
<type>igraph_heap_min_t</type> is a minimum heap with
<type>igraph_real_t</type> elements. The corresponding functions are
called <function>igraph_heap_min_init</function>,
<function>igraph_heap_min_pop</function>, etc.
</para></listitem>
<listitem><para>
<type>igraph_heap_int_t</type> is a maximum heap with <type>igraph_int_t</type>
elements. Its functions have the <function>igraph_heap_int_</function> prefix.
</para></listitem>
<listitem><para>
<type>igraph_heap_min_int_t</type> is a minimum heap containing
<type>igraph_int_t</type> elements. Its functions have the
<function>igraph_heap_min_int_</function> prefix.
</para></listitem>
<listitem><para>
<type>igraph_vector_list_t</type> is a list of (floating-point) vectors; each
element in this data structure is an <type>igraph_vector_t</type>.
Similarly, <type>igraph_matrix_list_t</type> is a list of (floating-point)
matrices; each element in this data structure is an <type>igraph_matrix_t</type>.
</para></listitem>
<listitem><para>
<type>igraph_vector_int_list_t</type> is a list of integer vectors; each
element in this data structure is an <type>igraph_vector_int_t</type>.
</para></listitem>
</itemizedlist>
</para>
<para>
Note that the <link linkend="VECTOR">VECTOR</link> and the <link
linkend="MATRIX">MATRIX</link> macros can be used on <emphasis>all</emphasis>
vector and matrix types. <link linkend="VECTOR">VECTOR</link> cannot be used
on <emphasis>lists</emphasis> of vectors, though, only on the individial
vectors in the list.
</para>
</section>