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< title > The MPL Reference Manual: and_< / title >
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< body class = "docframe refmanual" >
< table class = "header" > < tr class = "header" > < td class = "header-group navigation-bar" > < span class = "navigation-group" > < a href = "./logical-operations.html" class = "navigation-link" > Prev< / a > < a href = "./or.html" class = "navigation-link" > Next< / a > < / span > < span class = "navigation-group-separator" > | < / span > < span class = "navigation-group" > Back < a href = "./or.html" class = "navigation-link" > Along< / a > < / span > < span class = "navigation-group-separator" > | < / span > < span class = "navigation-group" > < a href = "./logical-operations.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 = "./metafunctions.html" class = "navigation-link" > Metafunctions< / a > / < a href = "./logical-operations.html" class = "navigation-link" > Logical Operations< / a > / < a href = "./and.html" class = "navigation-link" > and_< / a > < / td >
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< div class = "section" id = "and" >
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< h1 > < a class = "toc-backref" href = "./logical-operations.html#id1550" > and_< / a > < / h1 >
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< div class = "section" id = "id1068" >
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< h3 > < a class = "subsection-title" href = "#synopsis" name = "synopsis" > Synopsis< / a > < / h3 >
< pre class = "literal-block" >
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template<
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typename F1
, typename F2
< em > ...< / em >
, typename F< em > n< / em > = < em > unspecified< / em >
>
struct < a href = "./and.html" class = "identifier" > and_< / a >
{
typedef < em > unspecified< / em > type;
};
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< div class = "section" id = "id1069" >
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< h3 > < a class = "subsection-title" href = "#description" name = "description" > Description< / a > < / h3 >
< p > Returns the result of short-circuit < em > logical and< / em > (< tt class = "literal" > < span class = "pre" > & & < / span > < / tt > ) operation on its arguments.< / p >
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< div class = "section" id = "id1070" >
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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/and.hpp" class = "header" > boost/mpl/and.hpp< / a > >
#include < < a href = "../../../../boost/mpl/logical.hpp" class = "header" > boost/mpl/logical.hpp< / a > >
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< div class = "section" id = "id1071" >
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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 >
< tbody valign = "top" >
< tr > < td > < tt class = "literal" > < span class = "pre" > F1< / span > < / tt > , < tt class = "literal" > < span class = "pre" > F2< / span > < / tt > ,... < tt class = "literal" > < span class = "pre" > Fn< / span > < / tt > < / td >
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< td > Nullary < a class = "reference internal" href = "./metafunction.html" > Metafunction< / a > < / td >
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< td > Operation's arguments.< / td >
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< div class = "section" id = "id1072" >
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< h3 > < a class = "subsection-title" href = "#expression-semantics" name = "expression-semantics" > Expression semantics< / a > < / h3 >
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< p > For arbitrary nullary < a class = "reference internal" href = "./metafunction.html" > Metafunction< / a > s < tt class = "literal" > < span class = "pre" > f1< / span > < / tt > , < tt class = "literal" > < span class = "pre" > f2< / span > < / tt > ,... < tt class = "literal" > < span class = "pre" > fn< / span > < / tt > :< / p >
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< pre class = "literal-block" >
typedef < a href = "./and.html" class = "identifier" > and_< / a > < f1,f2,< em > ...< / em > ,f< em > n< / em > > ::type r;
< / 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" > < a class = "reference internal" href = "./integral-constant.html" > Integral Constant< / a > .< / td >
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< / tr >
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< tr class = "field" > < th class = "field-name" > Semantics:< / th > < td class = "field-body" > < tt class = "literal" > < span class = "pre" > r< / span > < / tt > is < tt class = "literal" > < span class = "pre" > < a href = "./bool.html" class = "identifier" > false_< / a > < / span > < / tt > if either of < tt class = "literal" > < span class = "pre" > f1::type::value< / span > < / tt > , < tt class = "literal" > < span class = "pre" > f2::type::value< / span > < / tt > ,...
< tt class = "literal" > < span class = "pre" > fn::type::value< / span > < / tt > expressions evaluates to < tt class = "literal" > < span class = "pre" > false< / span > < / tt > , and < tt class = "literal" > < span class = "pre" > < a href = "./bool.html" class = "identifier" > true_< / a > < / span > < / tt > otherwise;
guarantees left-to-right evaluation; the operands subsequent to the first
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< tt class = "literal" > < span class = "pre" > f< / span > < / tt > < em > i< / em > metafunction that evaluates to < tt class = "literal" > < span class = "pre" > false< / span > < / tt > are not evaluated.< / td >
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typedef < a href = "./and.html" class = "identifier" > and_< / a > < f1,f2,< em > ...< / em > ,f< em > n< / em > > r;
< / 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 >
< tr class = "field" > < th class = "field-name" > Semantics:< / th > < td class = "field-body" > < p class = "first" > Equivalent to< / p >
< pre class = "last literal-block" >
struct r : < a href = "./and.html" class = "identifier" > and_< / a > < f1,f2,< em > ...< / em > ,f< em > n< / em > > ::type {};
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< div class = "section" id = "id1073" >
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< h3 > < a class = "subsection-title" href = "#example" name = "example" > Example< / a > < / h3 >
< pre class = "literal-block" >
struct unknown;
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< a href = "./assert.html" class = "identifier" > BOOST_MPL_ASSERT< / a > (( < a href = "./and.html" class = "identifier" > and_< / a > < < a href = "./bool.html" class = "identifier" > true_< / a > ,< a href = "./bool.html" class = "identifier" > true_< / a > > ));
< a href = "./assert-not.html" class = "identifier" > BOOST_MPL_ASSERT_NOT< / a > (( < a href = "./and.html" class = "identifier" > and_< / a > < < a href = "./bool.html" class = "identifier" > false_< / a > ,< a href = "./bool.html" class = "identifier" > true_< / a > > ));
< a href = "./assert-not.html" class = "identifier" > BOOST_MPL_ASSERT_NOT< / a > (( < a href = "./and.html" class = "identifier" > and_< / a > < < a href = "./bool.html" class = "identifier" > true_< / a > ,< a href = "./bool.html" class = "identifier" > false_< / a > > ));
< a href = "./assert-not.html" class = "identifier" > BOOST_MPL_ASSERT_NOT< / a > (( < a href = "./and.html" class = "identifier" > and_< / a > < < a href = "./bool.html" class = "identifier" > false_< / a > ,< a href = "./bool.html" class = "identifier" > false_< / a > > ));
< a href = "./assert-not.html" class = "identifier" > BOOST_MPL_ASSERT_NOT< / a > (( < a href = "./and.html" class = "identifier" > and_< / a > < < a href = "./bool.html" class = "identifier" > false_< / a > ,unknown > )); // OK
< a href = "./assert-not.html" class = "identifier" > BOOST_MPL_ASSERT_NOT< / a > (( < a href = "./and.html" class = "identifier" > and_< / a > < < a href = "./bool.html" class = "identifier" > false_< / a > ,unknown,unknown > )); // OK too
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< div class = "section" id = "id1074" >
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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 = "./logical-operations.html" > Logical Operations< / a > , < a class = "reference internal" href = "./or.html" > or_< / a > , < a class = "reference internal" href = "./not.html" > not_< / 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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