Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

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size
Description

Returns the result type of size.

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

Table 1.28. Parameters

Parameter

Requirement

Description

Seq

A model of Forward Sequence

Argument sequence


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

Return type: An MPL Integral Constant.

Semantics: Returns the number of elements in Seq.

Header
#include <boost/fusion/sequence/intrinsic/size.hpp>
#include <boost/fusion/include/size.hpp>
Example
typedef vector<int,float,char> vec;
typedef result_of::size<vec>::type size_mpl_integral_constant;
BOOST_MPL_ASSERT_RELATION(size_mpl_integral_constant::value, ==, 3);

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