| /////////////////////////////////////////////////////////////////////////////// |
| /// \file empty.hpp |
| /// Proto callables for boost::empty() |
| // |
| // Copyright 2012 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_PROTO_FUNCTIONAL_RANGE_EMPTY_HPP_EAN_27_08_2012 |
| #define BOOST_PROTO_FUNCTIONAL_RANGE_EMPTY_HPP_EAN_27_08_2012 |
| |
| #include <boost/range/empty.hpp> |
| #include <boost/proto/proto_fwd.hpp> |
| |
| namespace boost { namespace proto { namespace functional |
| { |
| |
| // A PolymorphicFunctionObject that wraps boost::empty() |
| struct empty |
| { |
| BOOST_PROTO_CALLABLE() |
| |
| typedef bool result_type; |
| |
| template<typename Rng> |
| bool operator()(Rng const &rng) const |
| { |
| return boost::empty(rng); |
| } |
| }; |
| |
| }}} |
| |
| #endif |
