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 
17 namespace boost {
18 namespace lambda {
19 
20   // special types of lambda functors, used with control structures
21   // to guarantee that they are composed correctly.
22 
23 template<class Tag, class LambdaFunctor>
24 class tagged_lambda_functor;
25 
26 template<class Tag, class Args>
27 class tagged_lambda_functor<Tag, lambda_functor<Args> >
28   : public lambda_functor<Args>
29 {
30 public:
tagged_lambda_functor(const Args & a)31   tagged_lambda_functor(const Args& a) : lambda_functor<Args>(a) {}
32 
tagged_lambda_functor(const lambda_functor<Args> & a)33   tagged_lambda_functor(const lambda_functor<Args>& a)
34     : lambda_functor<Args>(a) {}
35 
36   // for the no body cases in control structures.
tagged_lambda_functor()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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