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< title > The MPL Reference Manual: always< / title >
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< table class = "header" > < tr class = "header" > < td class = "header-group navigation-bar" > < span class = "navigation-group" > < a href = "./identity.html" class = "navigation-link" > Prev< / a > < a href = "./inherit.html" class = "navigation-link" > Next< / a > < / span > < span class = "navigation-group-separator" > | < / span > < span class = "navigation-group" > < a href = "./identity.html" class = "navigation-link" > Back< / a > < a href = "./inherit.html" class = "navigation-link" > Along< / a > < / span > < span class = "navigation-group-separator" > | < / span > < span class = "navigation-group" > < a href = "./miscellaneous.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 = "./miscellaneous.html" class = "navigation-link" > Miscellaneous< / a > / < a href = "./always.html" class = "navigation-link" > always< / a > < / td >
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< div class = "section" id = "always" >
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< h1 > < a class = "toc-backref" href = "./miscellaneous.html#id1565" > always< / a > < / h1 >
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< div class = "section" id = "id1155" >
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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 X
>
struct < a href = "./always.html" class = "identifier" > always< / a >
{
// < em > unspecified< / em >
// < em > ...< / em >
};
< / pre >
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< div class = "section" id = "id1156" >
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< h3 > < a class = "subsection-title" href = "#description" name = "description" > Description< / a > < / h3 >
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< p > < tt class = "literal" > < span class = "pre" > < a href = "./always.html" class = "identifier" > always< / a > < X> < / span > < / tt > specialization is a variadic < a class = "reference internal" href = "./metafunction-class.html" > Metafunction Class< / a > always returning the
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same type, < tt class = "literal" > < span class = "pre" > X< / span > < / tt > , regardless of the number and types of passed arguments.< / p >
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< div class = "section" id = "id1157" >
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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/always.hpp" class = "header" > boost/mpl/always.hpp< / a > >
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< div class = "section" id = "id1158" >
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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-class.html" > Metafunction Class< / a > < / p >
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< / div >
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< div class = "section" id = "id1159" >
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< h3 > < a class = "subsection-title" href = "#parameters" name = "parameters" > Parameters< / a > < / h3 >
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< colgroup >
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< col width = "51%" / >
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< thead valign = "bottom" >
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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 be returned.< / td >
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< div class = "section" id = "id1160" >
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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" >
typedef < a href = "./always.html" class = "identifier" > always< / a > < x> f;
< / pre >
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< table class = "docutils field-list" frame = "void" rules = "none" >
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< col class = "field-name" / >
< col class = "field-body" / >
< tbody valign = "top" >
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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 = "./metafunction-class.html" > Metafunction Class< / 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" >
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struct f : < a href = "./bind.html" class = "identifier" > bind< / a > < < a href = "./identity.html" class = "identifier" > identity< / a > < < a href = "./placeholders.html" class = "identifier" > _1< / a > > , x > {};
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< / pre >
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< / tr >
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< h3 > < a class = "subsection-title" href = "#example" name = "example" > Example< / a > < / h3 >
< pre class = "literal-block" >
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typedef < a href = "./always.html" class = "identifier" > always< / a > < < a href = "./bool.html" class = "identifier" > true_< / a > > always_true;
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< a href = "./assert.html" class = "identifier" > BOOST_MPL_ASSERT< / a > (( < a href = "./apply.html" class = "identifier" > apply< / a > < always_true,< a href = "./bool.html" class = "identifier" > false_< / a > > ));
< a href = "./assert.html" class = "identifier" > BOOST_MPL_ASSERT< / a > (( < a href = "./apply.html" class = "identifier" > apply< / a > < always_true,< a href = "./bool.html" class = "identifier" > false_< / a > ,< a href = "./bool.html" class = "identifier" > false_< / a > > ));
< a href = "./assert.html" class = "identifier" > BOOST_MPL_ASSERT< / a > (( < a href = "./apply.html" class = "identifier" > apply< / a > < always_true,< a href = "./bool.html" class = "identifier" > false_< / a > ,< a href = "./bool.html" class = "identifier" > false_< / a > ,< a href = "./bool.html" class = "identifier" > false_< / a > > ));
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< / pre >
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< div class = "section" id = "id1162" >
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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 = "./metafunction-class.html" > Metafunction Class< / a > , < a class = "reference internal" href = "./identity.html" > identity< / a > , < a class = "reference internal" href = "./bind.html" > bind< / a > , < a class = "reference internal" href = "./apply.html" > apply< / a > < / p >
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