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<title>GNU Scientific Library – Reference Manual: Block allocation</title>
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<a name="Block-allocation"></a>
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Next: <a href="Reading-and-writing-blocks.html#Reading-and-writing-blocks" accesskey="n" rel="next">Reading and writing blocks</a>, Up: <a href="Blocks.html#Blocks" accesskey="u" rel="up">Blocks</a> [<a href="Function-Index.html#Function-Index" title="Index" rel="index">Index</a>]</p>
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<a name="Block-allocation-1"></a>
<h4 class="subsection">8.2.1 Block allocation</h4>
<p>The functions for allocating memory to a block follow the style of
<code>malloc</code> and <code>free</code>. In addition they also perform their own
error checking. If there is insufficient memory available to allocate a
block then the functions call the GSL error handler (with an error
number of <code>GSL_ENOMEM</code>) in addition to returning a null
pointer. Thus if you use the library error handler to abort your program
then it isn’t necessary to check every <code>alloc</code>.
</p>
<dl>
<dt><a name="index-gsl_005fblock_005falloc"></a>Function: <em>gsl_block *</em> <strong>gsl_block_alloc</strong> <em>(size_t <var>n</var>)</em></dt>
<dd><p>This function allocates memory for a block of <var>n</var> double-precision
elements, returning a pointer to the block struct. The block is not
initialized and so the values of its elements are undefined. Use the
function <code>gsl_block_calloc</code> if you want to ensure that all the
elements are initialized to zero.
</p>
<p>A null pointer is returned if insufficient memory is available to create
the block.
</p></dd></dl>
<dl>
<dt><a name="index-gsl_005fblock_005fcalloc"></a>Function: <em>gsl_block *</em> <strong>gsl_block_calloc</strong> <em>(size_t <var>n</var>)</em></dt>
<dd><p>This function allocates memory for a block and initializes all the
elements of the block to zero.
</p></dd></dl>
<dl>
<dt><a name="index-gsl_005fblock_005ffree"></a>Function: <em>void</em> <strong>gsl_block_free</strong> <em>(gsl_block * <var>b</var>)</em></dt>
<dd><p>This function frees the memory used by a block <var>b</var> previously
allocated with <code>gsl_block_alloc</code> or <code>gsl_block_calloc</code>.
</p></dd></dl>
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