📄 variant.utils.html
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<html><!-- #BeginTemplate "/Templates/tmpl.dwt" --><head><!-- #BeginEditable "doctitle" --> <title>PTypes: variant: utilities</title><!-- #EndEditable --> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><link rel="stylesheet" href="styles.css"></head><body bgcolor="#FFFFFF" leftmargin="40" marginwidth="40"><p><a href="../index.html"><img src="title-1.7.gif" width="213" height="34" alt="C++ Portable Types Library (PTypes) Version 1.7" border="0"></a> <hr noshade><!-- #BeginEditable "body" --> <p class="hpath"><a href="index.html">Top</a>: <a href="basic.html">Basic types</a>: <a href="variant.html">variant</a>: Utilities</p><blockquote> <pre class="lang">#include <ptypes.h> enum { VAR_NULL, VAR_INT, VAR_BOOL, VAR_FLOAT, VAR_STRING, VAR_ARRAY, VAR_OBJECT }; void clear(variant&);int vartype(const variant&);bool isnull(const variant&);bool isint(const variant&);bool isbool(const variant&);bool isfloat(const variant&);bool isstring(const variant&);bool isarray(const variant&);bool isobject(const variant&);const variant nullvar;</pre></blockquote><p><span class="def">void clear(variant&)</span> clears the variant and sets its state to unassigned (null).</p><p><span class="def">int vartype(const variant&)</span> returns the type of a variant, which can be compared with one of the <span class="lang">VAR_XXX</span> constants.</p><p><span class="def">bool isXXX(const variant&)</span> this group of inlined functions is provided to check whether the variant is of particular type.</p><p class="seealso">See also: <a href="variant.typecasts.html">Assignments and typecasts</a>, <a href="variant.arrays.html">Arrays</a>, <a href="variant.objrefs.html">Object references</a></p><!-- #EndEditable --><hr size="1"><a href="../index.html" class="ns">PTypes home</a></body><!-- #EndTemplate --></html>⌨️ 快捷键说明
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