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


/// \file size.hpp
/// Proto callables for boost::size()
//  Copyright 2012 Eric Niebler. Distributed under the Boost
//  Software License, Version 1.0. (See accompanying file
//  LICENSE_1_0.txt or copy at


#include <boost/range/size.hpp>
#include <boost/proto/proto_fwd.hpp>

namespace boost { namespace proto { namespace functional

    // A PolymorphicFunctionObject that wraps boost::size()
    struct size

        template<typename Sig>
        struct result;

        template<typename This, typename Rng>
        struct result<This(Rng)>
          : boost::range_size<Rng>

        template<typename This, typename Rng>
        struct result<This(Rng &)>
          : boost::range_size<Rng>

        template<typename Rng>
        typename boost::range_size<Rng>::type operator()(Rng const &rng) const
            return boost::size(rng);