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< title > The MPL Reference Manual: bool_</ title >
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< table class = "header" >< tr class = "header" >< td class = "header-group navigation-bar" >< span class = "navigation-group" >< a href = "./numeric.html" class = "navigation-link" > Prev</ a > < a href = "./int.html" class = "navigation-link" > Next</ a ></ span >< span class = "navigation-group-separator" > | </ span >< span class = "navigation-group" > Back < a href = "./int.html" class = "navigation-link" > Along</ a ></ span >< span class = "navigation-group-separator" > | </ span >< span class = "navigation-group" >< a href = "./numeric.html" class = "navigation-link" > Up</ a > < a href = "../refmanual.html" class = "navigation-link" > Home</ a ></ span >< span class = "navigation-group-separator" > | </ span >< span class = "navigation-group" >< a href = "./refmanual_toc.html" class = "navigation-link" > Full TOC</ a ></ span ></ td >
< td class = "header-group page-location" >< a href = "../refmanual.html" class = "navigation-link" > Front Page</ a > / < a href = "./data-types.html" class = "navigation-link" > Data Types</ a > / < a href = "./numeric.html" class = "navigation-link" > Numeric</ a > / < a href = "./bool.html" class = "navigation-link" > bool_</ a ></ td >
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< div class = "section" id = "bool" >
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< h1 >< a class = "toc-backref" href = "./numeric.html#id1576" > bool_</ a ></ h1 >
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< div class = "section" id = "id1222" >
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< h3 >< a class = "subsection-title" href = "#synopsis" name = "synopsis" > Synopsis</ a ></ h3 >
< pre class = "literal-block" >
template<
bool C
>
struct < a href = "./bool.html" class = "identifier" > bool_</ a >
{
// < em > unspecified</ em >
// ...
};
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typedef < a href = "./bool.html" class = "identifier" > bool_</ a > < true> < a href = "./bool.html" class = "identifier" > true_</ a > ;
typedef < a href = "./bool.html" class = "identifier" > bool_</ a > < false> < a href = "./bool.html" class = "identifier" > false_</ a > ;
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</ pre >
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< h3 >< a class = "subsection-title" href = "#description" name = "description" > Description</ a ></ h3 >
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< p > A boolean < a class = "reference internal" href = "./integral-constant.html" > Integral Constant</ a > wrapper.</ 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/bool.hpp" class = "header" > boost/mpl/bool.hpp</ a > >
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< div class = "section" id = "id1225" >
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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 = "./integral-constant.html" > Integral Constant</ a ></ p >
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</ div >
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< div class = "section" id = "id1226" >
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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" > C</ span ></ tt ></ td >
< td > A boolean integral constant</ td >
< td > A value to wrap.</ td >
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< div class = "section" id = "id1227" >
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< h3 >< a class = "subsection-title" href = "#expression-semantics" name = "expression-semantics" > Expression semantics</ a ></ h3 >
< p > The semantics of an expression are defined only
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where they differ from, or are not defined in < a class = "reference internal" href = "./integral-constant.html" > Integral Constant</ a > .</ p >
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< p > For arbitrary integral constant < tt class = "literal" >< span class = "pre" > c</ span ></ tt > :</ p >
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< tr >< th class = "head" > Expression</ th >
< th class = "head" > Semantics</ th >
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</ tr >
</ thead >
< tbody valign = "top" >
< tr >< td >< tt class = "literal" >< span class = "pre" >< a href = "./bool.html" class = "identifier" > bool_</ a > < c> </ span ></ tt ></ td >
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< td > An < a class = "reference internal" href = "./integral-constant.html" > Integral Constant</ a > < tt class = "literal" >< span class = "pre" > x</ span ></ tt > such that < tt class = "literal" >< span class = "pre" > x::value</ span > < span class = "pre" > ==</ span > < span class = "pre" > c</ span ></ tt >
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and < tt class = "literal" >< span class = "pre" > x::< a href = "./value-type.html" class = "identifier" > value_type</ a ></ span ></ tt > is identical to < tt class = "literal" >< span class = "pre" > bool</ span ></ tt > .</ td >
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< h3 >< a class = "subsection-title" href = "#example" name = "example" > Example</ a ></ h3 >
< pre class = "literal-block" >
< a href = "./assert.html" class = "identifier" > BOOST_MPL_ASSERT</ a > (( is_same< < a href = "./bool.html" class = "identifier" > bool_</ a > < true> ::< a href = "./value-type.html" class = "identifier" > value_type</ a > , bool > ));
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< a href = "./assert.html" class = "identifier" > BOOST_MPL_ASSERT</ a > (( is_same< < a href = "./bool.html" class = "identifier" > bool_</ a > < true> , < a href = "./bool.html" class = "identifier" > true_</ a > > )); }
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< a href = "./assert.html" class = "identifier" > BOOST_MPL_ASSERT</ a > (( is_same< < a href = "./bool.html" class = "identifier" > bool_</ a > < true> ::type, < a href = "./bool.html" class = "identifier" > bool_</ a > < true> > ));
< a href = "./assert-relation.html" class = "identifier" > BOOST_MPL_ASSERT_RELATION</ a > ( < a href = "./bool.html" class = "identifier" > bool_</ a > < true> ::value, ==, true );
assert( < a href = "./bool.html" class = "identifier" > bool_</ a > < true> () == true );
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< div class = "section" id = "id1229" >
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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 = "./data-types.html" > Data Types</ a > , < a class = "reference internal" href = "./integral-constant.html" > Integral Constant</ a > , < a class = "reference internal" href = "./int.html" > int_</ a > , < a class = "reference internal" href = "./long.html" > long_</ a > , < a class = "reference internal" href = "./integral-c.html" > integral_c</ a ></ p >
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<!-- Data Types/Numeric//int_ |20 -->
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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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