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< title > The MPL Reference Manual: sizeof_</ title >
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< td class = "header-group page-location" >< a href = "../refmanual.html" class = "navigation-link" > Front Page</ a > / < a href = "./metafunctions.html" class = "navigation-link" > Metafunctions</ a > / < a href = "./miscellaneous.html" class = "navigation-link" > Miscellaneous</ a > / < a href = "./sizeof.html" class = "navigation-link" > sizeof_</ a ></ td >
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< div class = "section" id = "sizeof" >
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< h1 >< a class = "toc-backref" href = "./miscellaneous.html#id1571" > sizeof_</ a ></ h1 >
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< div class = "section" id = "id1207" >
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< h3 >< a class = "subsection-title" href = "#synopsis" name = "synopsis" > Synopsis</ a ></ h3 >
< pre class = "literal-block" >
template<
typename X
>
struct < a href = "./sizeof.html" class = "identifier" > sizeof_</ a >
{
typedef < em > unspecified</ em > type;
};
</ pre >
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< div class = "section" id = "id1208" >
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< h3 >< a class = "subsection-title" href = "#description" name = "description" > Description</ a ></ h3 >
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< p > Returns the result of a < tt class = "literal" >< span class = "pre" > sizeof(X)</ span ></ tt > expression wrapped into an
< a class = "reference internal" href = "./integral-constant.html" > Integral Constant</ a > of the corresponding type, < tt class = "literal" >< span class = "pre" > std::< a href = "./size-t.html" class = "identifier" > size_t</ a ></ span ></ tt > .</ p >
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< h3 >< a class = "subsection-title" href = "#header" name = "header" > Header</ a ></ h3 >
< pre class = "literal-block" >
#include < < a href = "../../../../boost/mpl/sizeof.hpp" class = "header" > boost/mpl/sizeof.hpp</ a > >
</ pre >
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< div class = "section" id = "id1210" >
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< h3 >< a class = "subsection-title" href = "#model-of" name = "model-of" > Model of</ a ></ h3 >
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< p >< a class = "reference internal" href = "./metafunction.html" > Metafunction</ a ></ p >
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< div class = "section" id = "id1211" >
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< h3 >< a class = "subsection-title" href = "#parameters" name = "parameters" > Parameters</ a ></ h3 >
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< tr >< th class = "head" > Parameter</ th >
< th class = "head" > Requirement</ th >
< th class = "head" > Description</ th >
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</ tr >
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< tbody valign = "top" >
< tr >< td >< tt class = "literal" >< span class = "pre" > X</ span ></ tt ></ td >
< td > Any type</ td >
< td > A type to compute the < tt class = "literal" >< span class = "pre" > sizeof</ span ></ tt > for.</ td >
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< div class = "section" id = "id1212" >
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< h3 >< a class = "subsection-title" href = "#expression-semantics" name = "expression-semantics" > Expression semantics</ a ></ h3 >
< p > For an arbitrary type < tt class = "literal" >< span class = "pre" > x</ span ></ tt > :</ p >
< pre class = "literal-block" >
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typedef < a href = "./sizeof.html" class = "identifier" > sizeof_</ a > < x> ::type n;
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</ pre >
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< tr class = "field" >< th class = "field-name" > Return type:</ th >< td class = "field-body" >< p class = "first" >< a class = "reference internal" href = "./integral-constant.html" > Integral Constant</ a > .</ p >
</ td >
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</ tr >
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< tr class = "field" >< th class = "field-name" > Precondition:</ th >< td class = "field-body" >< p class = "first" >< tt class = "literal" >< span class = "pre" > x</ span ></ tt > is a complete type.</ p >
</ td >
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</ tr >
< tr class = "field" >< th class = "field-name" > Semantics:</ th >< td class = "field-body" >< p class = "first" > Equivalent to</ p >
< pre class = "last literal-block" >
typedef < a href = "./size-t.html" class = "identifier" > size_t</ a > < sizeof(x) > n;
</ pre >
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< div class = "section" id = "id1213" >
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< h3 >< a class = "subsection-title" href = "#complexity" name = "complexity" > Complexity</ a ></ h3 >
< p > Constant time.</ p >
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< div class = "section" id = "id1214" >
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< h3 >< a class = "subsection-title" href = "#example" name = "example" > Example</ a ></ h3 >
< pre class = "literal-block" >
struct udt { char a[100]; };
< a href = "./assert-relation.html" class = "identifier" > BOOST_MPL_ASSERT_RELATION</ a > ( < a href = "./sizeof.html" class = "identifier" > sizeof_</ a > < char> ::value, ==, sizeof(char) );
< a href = "./assert-relation.html" class = "identifier" > BOOST_MPL_ASSERT_RELATION</ a > ( < a href = "./sizeof.html" class = "identifier" > sizeof_</ a > < int> ::value, ==, sizeof(int) );
< a href = "./assert-relation.html" class = "identifier" > BOOST_MPL_ASSERT_RELATION</ a > ( < a href = "./sizeof.html" class = "identifier" > sizeof_</ a > < double> ::value, ==, sizeof(double) );
< a href = "./assert-relation.html" class = "identifier" > BOOST_MPL_ASSERT_RELATION</ a > ( < a href = "./sizeof.html" class = "identifier" > sizeof_</ a > < udt> ::value, ==, sizeof(my) );
</ pre >
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< div class = "section" id = "id1215" >
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< h3 >< a class = "subsection-title" href = "#see-also" name = "see-also" > See also</ a ></ h3 >
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< p >< a class = "reference internal" href = "./metafunctions.html" > Metafunctions</ a > , < a class = "reference internal" href = "./integral-constant.html" > Integral Constant</ a > , < a class = "reference internal" href = "./size-t.html" > size_t</ a ></ p >
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< td >< div class = "copyright-footer" >< div class = "copyright" > Copyright © 2001-2009 Aleksey Gurtovoy and David Abrahams</ div >
Distributed under the Boost Software License, Version 1.0. (See accompanying
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