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< a name = "fusion.sequences.adapted.boost__variant" ></ a >< a href = "boost__variant.html" title = "boost::variant" > boost::variant</ a ></ h4 ></ div ></ div ></ div >
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This module provides adapters for < code class = "computeroutput" >< span class = "identifier" > boost</ span >< span class = "special" > ::</ span >< span class = "identifier" > variant</ span ></ code > .
Including the module header makes < code class = "computeroutput" >< span class = "identifier" > boost</ span >< span class = "special" > ::</ span >< span class = "identifier" > variant</ span ></ code >
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a fully conforming < a href = "../concepts/forward_sequence.html" title = "Forward
Sequence" > Forward
Sequence</ a > . The variant acts as a sequence of the types that can be
contained in the variant. Accessing types not currently stored int the
variant will lead to the variant being populated with a default constructed
value of that type.
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< span class = "preprocessor" > #include</ span > < span class = "special" > < </ span >< span class = "identifier" > boost</ span >< span class = "special" > /</ span >< span class = "identifier" > fusion</ span >< span class = "special" > /</ span >< span class = "identifier" > sequence</ span >< span class = "special" > /</ span >< span class = "identifier" > adapted</ span >< span class = "special" > /</ span >< span class = "identifier" > variant</ span >< span class = "special" > .</ span >< span class = "identifier" > hpp</ span >< span class = "special" > > </ span >
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< a href = "boost__variant.html#fusion.sequences.adapted.boost__variant.model_of" > Model
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< a href = "boost__variant.html#fusion.sequences.adapted.boost__variant.example" > Example</ a >
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< span class = "identifier" > boost</ span >< span class = "special" > ::</ span >< span class = "identifier" > variant</ span >< span class = "special" > < </ span >< span class = "keyword" > int</ span >< span class = "special" > ,</ span >< span class = "identifier" > std</ span >< span class = "special" > ::</ span >< span class = "identifier" > string</ span >< span class = "special" > > </ span > < span class = "identifier" > example_variant</ span > < span class = "special" > =</ span > < span class = "number" > 101</ span >< span class = "special" > ;</ span >
< span class = "identifier" > std</ span >< span class = "special" > ::</ span >< span class = "identifier" > cout</ span > < span class = "special" > << </ span > < span class = "identifier" > example_variant</ span > < span class = "special" > << </ span > < span class = "char" > '\n'</ span >< span class = "special" > ;</ span >
< span class = "special" > *</ span >< span class = "identifier" > boost</ span >< span class = "special" > ::</ span >< span class = "identifier" > fusion</ span >< span class = "special" > ::</ span >< span class = "identifier" > find</ span >< span class = "special" > < </ span >< span class = "identifier" > std</ span >< span class = "special" > ::</ span >< span class = "identifier" > string</ span >< span class = "special" > > (</ span >< span class = "identifier" > example_variant</ span >< span class = "special" > )</ span > < span class = "special" > =</ span > < span class = "string" > "hello"</ span >< span class = "special" > ;</ span >
< span class = "identifier" > std</ span >< span class = "special" > ::</ span >< span class = "identifier" > cout</ span > < span class = "special" > << </ span > < span class = "identifier" > example_variant</ span > < span class = "special" > << </ span > < span class = "char" > '\n'</ span >< span class = "special" > ;</ span >
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< a href = "boost__variant.html#fusion.sequences.adapted.boost__variant.see_also" > See also</ a >
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< a href = "http://www.boost.org/doc/html/variant.html" target = "_top" > Boost.Variant Library</ a >
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