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///////////////////////////////////////////////////////////////////////////////
// count.hpp
//
// Copyright 2005 Eric Niebler. Distributed under the Boost
// Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
#ifndef BOOST_ACCUMULATORS_STATISTICS_COUNT_HPP_EAN_28_10_2005
#define BOOST_ACCUMULATORS_STATISTICS_COUNT_HPP_EAN_28_10_2005
#include <boost/mpl/always.hpp>
#include <boost/accumulators/framework/accumulator_base.hpp>
#include <boost/accumulators/framework/extractor.hpp>
#include <boost/accumulators/framework/depends_on.hpp>
#include <boost/accumulators/statistics_fwd.hpp>
namespace boost { namespace accumulators
{
namespace impl
{
///////////////////////////////////////////////////////////////////////////////
// count_impl
struct count_impl
: accumulator_base
{
// for boost::result_of
typedef std::size_t result_type;
count_impl(dont_care)
: cnt(0)
{
}
void operator ()(dont_care)
{
++this->cnt;
}
result_type result(dont_care) const
{
return this->cnt;
}
private:
std::size_t cnt;
};
} // namespace impl
///////////////////////////////////////////////////////////////////////////////
// tag::count
//
namespace tag
{
struct count
: depends_on<>
{
/// INTERNAL ONLY
///
typedef mpl::always<accumulators::impl::count_impl> impl;
};
}
///////////////////////////////////////////////////////////////////////////////
// extract::count
//
namespace extract
{
extractor<tag::count> const count = {};
BOOST_ACCUMULATORS_IGNORE_GLOBAL(count)
}
using extract::count;
}} // namespace boost::accumulators
#endif
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