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< title > The MPL Reference Manual: Lambda Expression</ title >
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< table class = "header" >< tr class = "header" >< td class = "header-group navigation-bar" >< span class = "navigation-group" >< a href = "./metafunction-class.html" class = "navigation-link" > Prev</ a > < a href = "./placeholder-expression.html" class = "navigation-link" > Next</ a ></ span >< span class = "navigation-group-separator" > | </ span >< span class = "navigation-group" >< a href = "./metafunction-class.html" class = "navigation-link" > Back</ a > < a href = "./placeholder-expression.html" class = "navigation-link" > Along</ a ></ span >< span class = "navigation-group-separator" > | </ span >< span class = "navigation-group" >< a href = "./metafunctions-concepts.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 = "./metafunctions-concepts.html" class = "navigation-link" > Concepts</ a > / < a href = "./lambda-expression.html" class = "navigation-link" > Lambda Expression</ a ></ td >
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< div class = "section" id = "lambda-expression" >
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< h1 >< a class = "toc-backref" href = "./metafunctions-concepts.html#id1514" > Lambda Expression</ a ></ h1 >
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< div class = "section" id = "id831" >
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< h3 >< a class = "subsection-title" href = "#description" name = "description" > Description</ a ></ h3 >
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< p > A < a class = "reference internal" href = "./lambda-expression.html" > Lambda Expression</ a > is a compile-time invocable entity in either of the following two
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forms:</ p >
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< li >< a class = "reference internal" href = "./metafunction-class.html" > Metafunction Class</ a ></ li >
< li >< a class = "reference internal" href = "./placeholder-expression.html" > Placeholder Expression</ a ></ li >
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< p > Most of the MPL components accept either of those, and the concept
gives us a consice way to describe these requirements.</ p >
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< div class = "section" id = "id832" >
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< h3 >< a class = "subsection-title" href = "#expression-requirements" name = "expression-requirements" > Expression requirements</ a ></ h3 >
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< p > See corresponding < a class = "reference internal" href = "./metafunction-class.html" > Metafunction Class</ a > and < a class = "reference internal" href = "./placeholder-expression.html" > Placeholder Expression</ a > specifications.</ p >
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< div class = "section" id = "id833" >
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< h3 >< a class = "subsection-title" href = "#models" name = "models" > Models</ a ></ h3 >
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< li >< a class = "reference internal" href = "./always.html" > always</ a ></ li >
< li >< a class = "reference internal" href = "./unpack-args.html" > unpack_args</ a ></ li >
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< li >< tt class = "literal" >< span class = "pre" >< a href = "./plus.html" class = "identifier" > plus</ a > < _,</ span > < span class = "pre" >< a href = "./int.html" class = "identifier" > int_</ a > < 2> </ span > < span class = "pre" > > </ span ></ tt ></ li >
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< li >< tt class = "literal" >< span class = "pre" >< a href = "./if.html" class = "identifier" > if_</ a > < </ span > < span class = "pre" >< a href = "./less.html" class = "identifier" > less</ a > < < a href = "./placeholders.html" class = "identifier" > _1</ a > ,</ span > < span class = "pre" >< a href = "./int.html" class = "identifier" > int_</ a > < 7> </ span > < span class = "pre" > > ,</ span > < span class = "pre" >< a href = "./plus.html" class = "identifier" > plus</ a > < < a href = "./placeholders.html" class = "identifier" > _1</ a > ,< a href = "./placeholders.html" class = "identifier" > _2</ a > > ,</ span > < span class = "pre" >< a href = "./placeholders.html" class = "identifier" > _1</ a ></ span > < span class = "pre" > > </ span ></ tt ></ li >
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< div class = "section" id = "id834" >
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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 = "./placeholders.html" > Placeholders</ a > , < a class = "reference internal" href = "./apply.html" > apply</ a > , < a class = "reference internal" href = "./lambda.html" > lambda</ a ></ p >
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<!-- Metafunctions/Concepts//Placeholder Expression |40 -->
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< td >< div class = "copyright-footer" >< div class = "copyright" > Copyright © 2001-2009 Aleksey Gurtovoy and David Abrahams</ div >
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