Boost C++ Libraries

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Description

Returns the result type of front.

Synopsis
template<typename Seq>
struct front
{
    typedef unspecified type;
};

Table 1.26. Parameters

Parameter

Requirement

Description

Seq

A model of Forward Sequence

Argument sequence


Expression Semantics
result_of::front<Seq>::type

Return type: Any type

Semantics: The type returned by dereferencing an iterator to the first element in Seq. Equivalent to result_of::deref<result_of::begin<Seq>::type>::type.

Header
#include <boost/fusion/sequence/intrinsic/front.hpp>
#include <boost/fusion/include/front.hpp>
Example
typedef vector<int,char> vec;
BOOST_MPL_ASSERT((boost::is_same<result_of::front<vec>::type, int&>));

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