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<title>Block allocation - GNU Scientific Library -- Reference Manual</title>
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<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>.
<div class="defun">
— Function: gsl_block * <b>gsl_block_alloc</b> (<var>size_t n</var>)<var><a name="index-gsl_005fblock_005falloc-845"></a></var><br>
<blockquote><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>A null pointer is returned if insufficient memory is available to create
the block.
</p></blockquote></div>
<div class="defun">
— Function: gsl_block * <b>gsl_block_calloc</b> (<var>size_t n</var>)<var><a name="index-gsl_005fblock_005fcalloc-846"></a></var><br>
<blockquote><p>This function allocates memory for a block and initializes all the
elements of the block to zero.
</p></blockquote></div>
<div class="defun">
— Function: void <b>gsl_block_free</b> (<var>gsl_block * b</var>)<var><a name="index-gsl_005fblock_005ffree-847"></a></var><br>
<blockquote><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>. The
block <var>b</var> must be a valid block object (a null pointer is not
allowed).
</p></blockquote></div>
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