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60 lines
1.9 KiB
60 lines
1.9 KiB
/////////////////////////////////////////////////////////////////////////////// |
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/// \file pop_back.hpp |
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/// Proto callables Fusion pop_back |
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// |
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// Copyright 2010 Eric Niebler. Distributed under the Boost |
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// Software License, Version 1.0. (See accompanying file |
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
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#ifndef BOOST_PROTO_FUNCTIONAL_FUSION_POP_BACK_HPP_EAN_11_27_2010 |
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#define BOOST_PROTO_FUNCTIONAL_FUSION_POP_BACK_HPP_EAN_11_27_2010 |
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#include <boost/fusion/include/begin.hpp> |
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#include <boost/fusion/include/end.hpp> |
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#include <boost/fusion/include/prior.hpp> |
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#include <boost/fusion/include/pop_back.hpp> |
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#include <boost/proto/proto_fwd.hpp> |
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namespace boost { namespace proto { namespace functional |
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{ |
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/// \brief A PolymorphicFunctionObject type that invokes the |
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/// \c fusion::pop_back() algorithm on its argument. |
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/// |
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/// A PolymorphicFunctionObject type that invokes the |
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/// \c fusion::pop_back() algorithm on its argument. |
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struct pop_back |
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{ |
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BOOST_PROTO_CALLABLE() |
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template<typename Sig> |
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struct result; |
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template<typename This, typename Seq> |
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struct result<This(Seq)> |
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: result<This(Seq const &)> |
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{}; |
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template<typename This, typename Seq> |
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struct result<This(Seq &)> |
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: fusion::result_of::pop_back<Seq> |
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{}; |
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template<typename Seq> |
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typename fusion::result_of::pop_back<Seq>::type |
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operator ()(Seq &seq) const |
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{ |
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// Work around a const-correctness issue in Fusion |
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typedef typename fusion::result_of::pop_back<Seq>::type result_type; |
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return result_type(fusion::begin(seq), fusion::prior(fusion::end(seq))); |
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} |
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template<typename Seq> |
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typename fusion::result_of::pop_back<Seq const>::type |
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operator ()(Seq const &seq) const |
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{ |
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return fusion::pop_back(seq); |
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} |
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}; |
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}}} |
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#endif
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