boost/spirit/home/x3/support/utility/lambda_visitor.hpp
/*=============================================================================
Copyright (c) 2014 Joel de Guzman
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_X3_LAMBDA_VISITOR_MAY_19_2014_1116AM)
#define BOOST_SPIRIT_X3_LAMBDA_VISITOR_MAY_19_2014_1116AM
namespace boost { namespace spirit { namespace x3
{
template <typename RT, typename... Lambdas>
struct lambda_visitor;
template <typename RT, typename F, typename... Lambdas>
struct lambda_visitor<RT, F, Lambdas...> : F, lambda_visitor<RT, Lambdas...>
{
typedef lambda_visitor<RT , Lambdas...> base_type;
using F::operator();
using base_type::operator();
lambda_visitor(F f, Lambdas... lambdas)
: F(f), base_type(lambdas...)
{}
};
template <typename RT, typename F>
struct lambda_visitor<RT, F> : F
{
typedef RT result_type;
using F::operator();
lambda_visitor(F f)
: F(f)
{}
};
template <typename RT>
struct lambda_visitor<RT>
{
typedef RT result_type;
};
template <typename RT, typename... Lambdas>
lambda_visitor<RT, Lambdas...> make_lambda_visitor(Lambdas... lambdas)
{
return { lambdas... };
}
}}}
#endif
