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< title > The MPL Reference Manual: sizeof_< / title >
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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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< 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;
};
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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 > >
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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 >
< / thead >
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< 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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< 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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< table class = "docutils field-list" frame = "void" rules = "none" >
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< col class = "field-name" / >
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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 >
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typedef < a href = "./size-t.html" class = "identifier" > size_t< / a > < sizeof(x) > n;
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< h3 > < a class = "subsection-title" href = "#complexity" name = "complexity" > Complexity< / a > < / h3 >
< p > Constant time.< / p >
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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) );
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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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