47 lines
1.2 KiB
C++
47 lines
1.2 KiB
C++
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/*=============================================================================
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Copyright (c) 2001-2011 Joel de Guzman
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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==============================================================================*/
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#if !defined(BOOST_SPIRIT_LAZY_NOVEMBER_04_2008_1157AM)
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#define BOOST_SPIRIT_LAZY_NOVEMBER_04_2008_1157AM
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#if defined(_MSC_VER)
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#pragma once
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#endif
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#include <boost/spirit/home/support/modify.hpp>
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#include <boost/spirit/home/support/detail/is_spirit_tag.hpp>
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#include <boost/proto/traits.hpp>
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namespace boost { namespace phoenix
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{
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template <typename Expr>
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struct actor;
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}}
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namespace boost { namespace spirit
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{
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template <typename Eval>
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typename proto::terminal<phoenix::actor<Eval> >::type
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lazy(phoenix::actor<Eval> const& f)
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{
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return proto::terminal<phoenix::actor<Eval> >::type::make(f);
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}
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namespace tag
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{
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struct lazy_eval
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{
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BOOST_SPIRIT_IS_TAG()
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};
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}
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template <typename Domain>
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struct is_modifier_directive<Domain, tag::lazy_eval>
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: mpl::true_ {};
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}}
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#endif
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