135 lines
5.0 KiB
HTML
135 lines
5.0 KiB
HTML
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<head>
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<title>The GNU Fortran Compiler: ALLOCATED</title>
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Intrinsic-Procedures.html#Intrinsic-Procedures" rel="up" title="Intrinsic Procedures">
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<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
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<a name="ALLOCATED"></a>
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<div class="header">
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<p>
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Next: <a href="AND.html#AND" accesskey="n" rel="next">AND</a>, Previous: <a href="ALL.html#ALL" accesskey="p" rel="prev">ALL</a>, Up: <a href="Intrinsic-Procedures.html#Intrinsic-Procedures" accesskey="u" rel="up">Intrinsic Procedures</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="ALLOCATED-_002d_002d_002d-Status-of-an-allocatable-entity"></a>
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<h3 class="section">9.14 <code>ALLOCATED</code> — Status of an allocatable entity</h3>
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<a name="index-ALLOCATED"></a>
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<a name="index-allocation_002c-status"></a>
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<dl compact="compact">
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<dt><em>Description</em>:</dt>
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<dd><p><code>ALLOCATED(ARRAY)</code> and <code>ALLOCATED(SCALAR)</code> check the allocation
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status of <var>ARRAY</var> and <var>SCALAR</var>, respectively.
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</p>
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</dd>
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<dt><em>Standard</em>:</dt>
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<dd><p>Fortran 95 and later. Note, the <code>SCALAR=</code> keyword and allocatable
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scalar entities are available in Fortran 2003 and later.
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</p>
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</dd>
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<dt><em>Class</em>:</dt>
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<dd><p>Inquiry function
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</p>
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</dd>
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<dt><em>Syntax</em>:</dt>
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<dd><table>
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<tr><td width="80%"><code>RESULT = ALLOCATED(ARRAY)</code></td></tr>
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<tr><td width="80%"><code>RESULT = ALLOCATED(SCALAR)</code></td></tr>
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</table>
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</dd>
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<dt><em>Arguments</em>:</dt>
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<dd><table>
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<tr><td width="15%"><var>ARRAY</var></td><td width="70%">The argument shall be an <code>ALLOCATABLE</code> array.</td></tr>
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<tr><td width="15%"><var>SCALAR</var></td><td width="70%">The argument shall be an <code>ALLOCATABLE</code> scalar.</td></tr>
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</table>
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</dd>
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<dt><em>Return value</em>:</dt>
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<dd><p>The return value is a scalar <code>LOGICAL</code> with the default logical
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kind type parameter. If the argument is allocated, then the result is
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<code>.TRUE.</code>; otherwise, it returns <code>.FALSE.</code>
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</p>
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</dd>
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<dt><em>Example</em>:</dt>
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<dd><div class="smallexample">
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<pre class="smallexample">program test_allocated
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integer :: i = 4
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real(4), allocatable :: x(:)
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if (.not. allocated(x)) allocate(x(i))
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end program test_allocated
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</pre></div>
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</dd>
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</dl>
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