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1 | /*============================================================================= |
2 | Copyright (c) 2001-2011 Joel de Guzman | |
3 | ||
4 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
5 | file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
6 | ==============================================================================*/ | |
7 | #if !defined(BOOST_SPIRIT_LAZY_NOVEMBER_04_2008_1157AM) | |
8 | #define BOOST_SPIRIT_LAZY_NOVEMBER_04_2008_1157AM | |
9 | ||
10 | #if defined(_MSC_VER) | |
11 | #pragma once | |
12 | #endif | |
13 | ||
14 | #include <boost/spirit/include/phoenix_core.hpp> | |
15 | #include <boost/proto/proto.hpp> | |
16 | #include <boost/spirit/home/support/modify.hpp> | |
17 | #include <boost/spirit/home/support/detail/is_spirit_tag.hpp> | |
18 | ||
19 | namespace boost { namespace spirit | |
20 | { | |
21 | template <typename Eval> | |
22 | typename proto::terminal<phoenix::actor<Eval> >::type | |
23 | lazy(phoenix::actor<Eval> const& f) | |
24 | { | |
25 | return proto::terminal<phoenix::actor<Eval> >::type::make(f); | |
26 | } | |
27 | ||
28 | namespace tag | |
29 | { | |
30 | struct lazy_eval | |
31 | { | |
32 | BOOST_SPIRIT_IS_TAG() | |
33 | }; | |
34 | } | |
35 | ||
36 | template <typename Domain> | |
37 | struct is_modifier_directive<Domain, tag::lazy_eval> | |
38 | : mpl::true_ {}; | |
39 | }} | |
40 | ||
41 | #endif |