third_party/boost/include/boost/spirit/home/karma/numeric/detail/bool_utils.hpp

//  Copyright (c) 2001-2011 Hartmut Kaiser
// 
//  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)

#if !defined(BOOST_SPIRIT_KARMA_BOOL_UTILS_SEP_28_2009_0644PM)
#define BOOST_SPIRIT_KARMA_BOOL_UTILS_SEP_28_2009_0644PM

#if defined(_MSC_VER)
#pragma once
#endif

#include <boost/spirit/home/support/char_class.hpp>
#include <boost/spirit/home/support/unused.hpp>
#include <boost/spirit/home/karma/detail/generate_to.hpp>
#include <boost/spirit/home/karma/detail/string_generate.hpp>
#include <boost/spirit/home/karma/numeric/detail/numeric_utils.hpp>
#include <boost/detail/workaround.hpp>

namespace boost { namespace spirit { namespace karma 
{ 
    ///////////////////////////////////////////////////////////////////////////
    //
    //  The bool_inserter template takes care of the boolean to string 
    //  conversion. The Policies template parameter is used to allow
    //  customization of the formatting process
    //
    ///////////////////////////////////////////////////////////////////////////
    template <typename T>
    struct bool_policies;

    template <typename T
      , typename Policies = bool_policies<T>
      , typename CharEncoding = unused_type
      , typename Tag = unused_type>
    struct bool_inserter
    {
        template <typename OutputIterator, typename U>
        static bool
        call (OutputIterator& sink, U b, Policies const& p = Policies())
        {
#if BOOST_WORKAROUND(BOOST_MSVC, BOOST_TESTED_AT(1600))
            p; // suppresses warning: C4100: 'p' : unreferenced formal parameter
#endif
            return p.template call<bool_inserter>(sink, T(b), p);
        }

        ///////////////////////////////////////////////////////////////////////
        //  This is the workhorse behind the real generator
        ///////////////////////////////////////////////////////////////////////
        template <typename OutputIterator, typename U>
        static bool
        call_n (OutputIterator& sink, U b, Policies const& p)
        {
#if BOOST_WORKAROUND(BOOST_MSVC, BOOST_TESTED_AT(1600))
            p; // suppresses warning: C4100: 'p' : unreferenced formal parameter
#endif
            if (b) 
                return p.template generate_true<CharEncoding, Tag>(sink, b);
            return p.template generate_false<CharEncoding, Tag>(sink, b);
        }
    };

}}}

#endif