1 // Boost Lambda Library -- control_constructs_common.hpp -------------------

     2 

     3 // Copyright (C) 1999, 2000 Jaakko Järvi (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:

    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

    44 

    45 

    46 

    47 

    48 

    49 

    50