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

// Copyright (C) 1999, 2000 Jaakko Järvi (jaakko.jarvi@cs.utu.fi)

// Copyright (C) 2000 Gary Powell (powellg@amazon.com)

//

// Distributed under the Boost Software License, Version 1.0. (See

// accompanying file LICENSE_1_0.txt or copy at

// http://www.boost.org/LICENSE_1_0.txt)

//

// For more information, see www.boost.org

// --------------------------------------------------------------------------

#if !defined(BOOST_CONTROL_CONSTRUCTS_COMMON_HPP)

#define BOOST_CONTROL_CONSTRUCTS_COMMON_HPP

namespace boost { 

namespace lambda {

  // special types of lambda functors, used with control structures

  // to guarantee that they are composed correctly.

template<class Tag, class LambdaFunctor>

class tagged_lambda_functor;

template<class Tag, class Args>

class tagged_lambda_functor<Tag, lambda_functor<Args> > 

  : public lambda_functor<Args> 

{

public:

  tagged_lambda_functor(const Args& a) : lambda_functor<Args>(a) {}

  tagged_lambda_functor(const lambda_functor<Args>& a) 

    : lambda_functor<Args>(a) {}

  // for the no body cases in control structures.

  tagged_lambda_functor() : lambda_functor<Args>() {}

};

} // lambda

} // boost

#endif // BOOST_CONTROL_CONSTRUCTS_COMMON_HPP