<!-- ##### SECTION Short_Description ##### -->
-Portably storing integers in pointer variables.
+portably storing integers in pointer variables.
<!-- ##### SECTION Long_Description ##### -->
<para>
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:
-<programlisting>
+<informalexample><programlisting>
int *ip = g_new (int, 1);
*ip = 42;
-</programlisting>
+</programlisting></informalexample>
But this is inconvenient, and it's annoying to have to free the
memory at some later time.
</para>
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:
-<programlisting>
+<informalexample><programlisting>
gpointer p;
int i;
p = (void*) 42;
i = (int) p;
-</programlisting>
-Again, that example was NOT correct, don't copy it. The problem is
-that on some systems you need to do this:
-<programlisting>
+</programlisting></informalexample>
+Again, that example was <emphasis>not</emphasis> correct, don't copy it.
+The problem is that on some systems you need to do this:
+<informalexample><programlisting>
gpointer p;
int i;
p = (void*) (long) 42;
i = (int) (long) p;
-</programlisting>
+</programlisting></informalexample>
So GPOINTER_TO_INT(), GINT_TO_POINTER(), etc. do the right thing
on the current platform.
</para>
integer; values outside the range of a 32-bit integer will be mangled.
</para>
-@i: integer to stuff into a pointer
+@i: integer to stuff into a pointer.
<!-- ##### MACRO GPOINTER_TO_INT ##### -->
<!-- ##### MACRO GUINT_TO_POINTER ##### -->
<para>
-Same as GINT_TO_POINTER(), but for unsigned integers.
+Stuffs an unsigned integer into a pointer type.
</para>
-@u: integer to stuff into the pointer
+@u: unsigned integer to stuff into the pointer.
<!-- ##### MACRO GPOINTER_TO_UINT ##### -->
<para>
-Same as GPOINTER_TO_INT(), but for unsigned integers.
+Extracts an unsigned integer from a pointer. The integer must have
+been stored in the pointer with GUINT_TO_POINTER().
</para>
-@p: pointer to extract an integer from
+@p: pointer to extract an unsigned integer from.
+
+
+<!-- ##### MACRO GSIZE_TO_POINTER ##### -->
+<para>
+Stuffs a #gsize into a pointer type.
+</para>
+
+@s: #gsize to stuff into the pointer.
+
+
+<!-- ##### MACRO GPOINTER_TO_SIZE ##### -->
+<para>
+Extracts a #gsize from a pointer. The #gsize must have
+been stored in the pointer with GSIZE_TO_POINTER().
+</para>
+
+@p: pointer to extract a #gsize from.