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<p>Name lookup is the procedure by which a <a href="name.html" title="cpp/language/name" class="mw-redirect">name</a>, when encountered in a program, is associated with the <a href="declarations.html" title="cpp/language/declarations">declaration</a> that introduced it.
</p><p>For function names, name lookup can associate multiple declarations with the same name, and may obtain additional declarations from <a href="adl.html" title="cpp/language/adl">argument-dependent lookup</a>. <a href="function_template.html" title="cpp/language/function template">Template argument deduction</a> may also apply, and the set of declarations is passed to <a href="overload_resolution.html" title="cpp/language/overload resolution">overload resolution</a>, which selects the declaration that will be used. <a href="access.html" title="cpp/language/access">Member access</a> rules, if applicable, are considered only after name lookup and overload resolution.
</p><p>For all other names (variables, namespaces, classes, etc), name lookup must produce a single declaration in order for the program to compile.
</p><p>For example, to compile <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../io/cout.html"><span class="kw1446">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> <a href="../io/manip/endl.html"><span class="kw1479">std::<span class="me2">endl</span></span></a><span class="sy4">;</span></span></span>, the compiler performs:
</p>
<ul><li> unqualified name lookup for the name <code>std</code>, which finds the declaration of namespace std in the header <code><iostream></code>
</li><li> qualified name lookup for the name <code>cout</code>, which finds a variable declaration in the namespace <code>std</code>
</li><li> qualified name lookup for the name <code>endl</code>, which finds a function template declaration in the namespace <code>std</code>
</li><li> <a href="adl.html" title="cpp/language/adl">argument-dependent lookup</a> for the name <code>operator <<</code>, which finds multiple function template declarations in the namespace std
</li></ul>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/language/lookup&action=edit&section=1" title="Edit section: Types of lookup">edit</a>]</span> <span class="mw-headline" id="Types_of_lookup">Types of lookup</span></h3>
<p>If the name appears immediately to the right of the scope resolution operator <code><b>::</b></code> or possibly after <code><b>::</b></code> followed by the disambiguating keyword <code>template</code>, see
</p>
<ul><li> <a href="qualified_lookup.html" title="cpp/language/qualified lookup">Qualified name lookup</a>
</li></ul>
<p>Otherwise, see
</p>
<ul><li> <a href="unqualified_lookup.html" title="cpp/language/unqualified lookup">Unqualified name lookup</a>
</li></ul>
<dl><dd><ul><li> (which, for function names, includes <a href="adl.html" title="cpp/language/adl">Argument-dependent lookup</a>)
</li></ul>
</dd></dl>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/language/lookup&action=edit&section=2" title="Edit section: See also">edit</a>]</span> <span class="mw-headline" id="See_also">See also</span></h3>
<ul><li> <a href="scope.html" title="cpp/language/scope">Scope</a>
</li><li> <a href="adl.html" title="cpp/language/adl">Argument-dependent lookup</a>
</li><li> <a href="function_template.html" title="cpp/language/function template">Template argument deduction</a>
</li><li> <a href="overload_resolution.html" title="cpp/language/overload resolution">Overload resolution</a>
</li></ul>
<table class="t-dsc-begin">
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<td colspan="2"> <div class="t-dsc-see"><span><a href="../../c/language/name_space.html" title="c/language/name space">C documentation</a></span> for <span class="t-dsc-see-tt"><span>Lookup and name spaces</span></span></div>
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