is_sequence

Metafunction that evaluates to mpl::true_ if a certain type T is a conforming Fusion Sequence, mpl::false_ otherwise. This may be specialized to accomodate clients which provide Fusion conforming sequences.

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Synopsis

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Synopsis

>>>>>>> .merge-right.r57125

namespace traits
{
    template <typename T>
    struct is_sequence
    {
        typedef unspecified type;
    };
}

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Parameters

=======

Parameters

>>>>>>> .merge-right.r57125

Parameter	Requirement	Description
`T`	Any type	The type to query.

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Expression =======

Expression >>>>>>> .merge-right.r57125 Semantics

typedef traits::is_sequence<T>::type c;

Return type: An MPL Boolean Constant.

Semantics: Metafunction that evaluates to mpl::true_ if a certain type T is a conforming Fusion sequence, mpl::false_ otherwise.

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Header

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Header

>>>>>>> .merge-right.r57125

#include <boost/fusion/support/is_sequence.hpp>
#include <boost/fusion/include/is_sequence.hpp>

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Example

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Example

>>>>>>> .merge-right.r57125

BOOST_MPL_ASSERT_NOT(( traits::is_sequence< std::vector<int> > ));
BOOST_MPL_ASSERT_NOT(( is_sequence< int > ));
BOOST_MPL_ASSERT(( traits::is_sequence<list<> > ));
BOOST_MPL_ASSERT(( traits::is_sequence<list<int> > ));
BOOST_MPL_ASSERT(( traits::is_sequence<vector<> > ));
BOOST_MPL_ASSERT(( traits::is_sequence<vector<int> > ));