1// Boost Lambda Library -- control_constructs_common.hpp -------------------
2
3// Copyright (C) 1999, 2000 Jaakko Jarvi (jaakko.jarvi@cs.utu.fi)
4// Copyright (C) 2000 Gary Powell (powellg@amazon.com)
5//
6// Distributed under the Boost Software License, Version 1.0. (See
7// accompanying file LICENSE_1_0.txt or copy at
8// http://www.boost.org/LICENSE_1_0.txt)
9//
10// For more information, see www.boost.org
11
12// --------------------------------------------------------------------------
13
14#if !defined(BOOST_CONTROL_CONSTRUCTS_COMMON_HPP)
15#define BOOST_CONTROL_CONSTRUCTS_COMMON_HPP
16
17namespace boost {
18namespace lambda {
19
20 // special types of lambda functors, used with control structures
21 // to guarantee that they are composed correctly.
22
23template<class Tag, class LambdaFunctor>
24class tagged_lambda_functor;
25
26template<class Tag, class Args>
27class tagged_lambda_functor<Tag, lambda_functor<Args> >
28 : public lambda_functor<Args>
29{
30public:
31 tagged_lambda_functor(const Args& a) : lambda_functor<Args>(a) {}
32
33 tagged_lambda_functor(const lambda_functor<Args>& a)
34 : lambda_functor<Args>(a) {}
35
36 // for the no body cases in control structures.
37 tagged_lambda_functor() : lambda_functor<Args>() {}
38};
39
40} // lambda
41} // boost
42
43#endif // BOOST_CONTROL_CONSTRUCTS_COMMON_HPP
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