sl@0: // -- Boost Lambda Library - actions.hpp ----------------------------------
sl@0: 
sl@0: // Copyright (C) 1999, 2000 Jaakko Järvi (jaakko.jarvi@cs.utu.fi)
sl@0: //
sl@0: // Distributed under the Boost Software License, Version 1.0. (See
sl@0: // accompanying file LICENSE_1_0.txt or copy at
sl@0: // http://www.boost.org/LICENSE_1_0.txt)
sl@0: 
sl@0: // For more information, see www.boost.org
sl@0: 
sl@0: // ----------------------------------------------------------------
sl@0: 
sl@0: #ifndef BOOST_LAMBDA_ACTIONS_HPP
sl@0: #define BOOST_LAMBDA_ACTIONS_HPP
sl@0: 
sl@0: namespace boost { 
sl@0: namespace lambda {
sl@0: 
sl@0: 
sl@0: 
sl@0: template<int Arity, class Act> class action;
sl@0: 
sl@0: // these need to be defined here, since the corresponding lambda 
sl@0: // functions are members of lambda_functor classes
sl@0: 
sl@0: class assignment_action {};
sl@0: class subscript_action {};
sl@0: 
sl@0: template <class Action> class other_action;
sl@0: 
sl@0: // action for specifying the explicit return type
sl@0: template <class RET> class explicit_return_type_action {};
sl@0: 
sl@0: // action for preventing the expansion of a lambda expression
sl@0: struct protect_action {};
sl@0: 
sl@0:   // must be defined here, comma is a special case
sl@0: struct comma_action {};
sl@0: 
sl@0: 
sl@0:   // actions, for which the existence of protect is checked in return type 
sl@0:   // deduction.
sl@0: 
sl@0: template <class Action> struct is_protectable {
sl@0:   BOOST_STATIC_CONSTANT(bool, value = false);
sl@0: };
sl@0: 
sl@0: // NOTE: comma action is protectable. Other protectable actions
sl@0: // are listed in operator_actions.hpp
sl@0: 
sl@0: template<> struct is_protectable<other_action<comma_action> > {
sl@0:   BOOST_STATIC_CONSTANT(bool, value = true);
sl@0: };
sl@0: 
sl@0: 
sl@0: namespace detail {
sl@0: 
sl@0:   // this type is used in return type deductions to signal that deduction 
sl@0:   // did not find a result. It does not necessarily mean an error, it commonly
sl@0:   // means that something else should be tried.
sl@0:   class unspecified {};
sl@0: }
sl@0: 
sl@0:   // function action is a special case: bind functions can be called with 
sl@0:   // the return type specialized explicitly e.g. bind<int>(foo);
sl@0:   // If this call syntax is used, the return type is stored in the latter
sl@0:   // argument of function_action template. Otherwise the argument gets the type
sl@0:   // 'unspecified'.
sl@0:   // This argument is only relevant in the return type deduction code
sl@0: template <int I, class Result_type = detail::unspecified> 
sl@0: class function_action {};
sl@0:    
sl@0: template<class T> class function_action<1, T> {
sl@0: public:
sl@0:   template<class RET, class A1>
sl@0:   static RET apply(A1& a1) {
sl@0:     return function_adaptor<typename boost::remove_cv<A1>::type>::
sl@0:       template apply<RET>(a1);
sl@0:   }
sl@0: };
sl@0: 
sl@0: template<class T> class function_action<2, T> {
sl@0: public:
sl@0:   template<class RET, class A1, class A2>
sl@0:   static RET apply(A1& a1, A2& a2) {
sl@0:     return function_adaptor<typename boost::remove_cv<A1>::type>::
sl@0:       template apply<RET>(a1, a2);
sl@0:   }
sl@0: };
sl@0: 
sl@0: template<class T> class function_action<3, T> {
sl@0: public:
sl@0:   template<class RET, class A1, class A2, class A3>
sl@0:   static RET apply(A1& a1, A2& a2, A3& a3) {
sl@0:     return function_adaptor<typename boost::remove_cv<A1>::type>::
sl@0:       template apply<RET>(a1, a2, a3);
sl@0:   }
sl@0: };
sl@0: 
sl@0: template<class T> class function_action<4, T> {
sl@0: public:
sl@0:   template<class RET, class A1, class A2, class A3, class A4>
sl@0:   static RET apply(A1& a1, A2& a2, A3& a3, A4& a4) {
sl@0:     return function_adaptor<typename boost::remove_cv<A1>::type>::
sl@0:       template apply<RET>(a1, a2, a3, a4);
sl@0:   }
sl@0: };
sl@0: 
sl@0: template<class T> class function_action<5, T> {
sl@0: public:
sl@0:   template<class RET, class A1, class A2, class A3, class A4, class A5>
sl@0:   static RET apply(A1& a1, A2& a2, A3& a3, A4& a4, A5& a5) {
sl@0:     return function_adaptor<typename boost::remove_cv<A1>::type>::
sl@0:       template apply<RET>(a1, a2, a3, a4, a5);
sl@0:   }
sl@0: };
sl@0: 
sl@0: template<class T> class function_action<6, T> {
sl@0: public:
sl@0:   template<class RET, class A1, class A2, class A3, class A4, class A5, 
sl@0:            class A6>
sl@0:   static RET apply(A1& a1, A2& a2, A3& a3, A4& a4, A5& a5, A6& a6) {
sl@0:     return function_adaptor<typename boost::remove_cv<A1>::type>::
sl@0:       template apply<RET>(a1, a2, a3, a4, a5, a6);
sl@0:   }
sl@0: };
sl@0: 
sl@0: template<class T> class function_action<7, T> {
sl@0: public:
sl@0:   template<class RET, class A1, class A2, class A3, class A4, class A5,  
sl@0:            class A6, class A7>
sl@0:   static RET apply(A1& a1, A2& a2, A3& a3, A4& a4, A5& a5, A6& a6, A7& a7) {
sl@0:     return function_adaptor<typename boost::remove_cv<A1>::type>::
sl@0:       template apply<RET>(a1, a2, a3, a4, a5, a6, a7);
sl@0:   }
sl@0: };
sl@0: 
sl@0: template<class T> class function_action<8, T> {
sl@0: public:
sl@0:   template<class RET, class A1, class A2, class A3, class A4, class A5, 
sl@0:            class A6, class A7, class A8>
sl@0:   static RET apply(A1& a1, A2& a2, A3& a3, A4& a4, A5& a5, A6& a6, A7& a7, 
sl@0:                    A8& a8) {
sl@0:     return function_adaptor<typename boost::remove_cv<A1>::type>::
sl@0:       template apply<RET>(a1, a2, a3, a4, a5, a6, a7, a8);
sl@0:   }
sl@0: };
sl@0: 
sl@0: template<class T> class function_action<9, T> {
sl@0: public:
sl@0:   template<class RET, class A1, class A2, class A3, class A4, class A5, 
sl@0:            class A6, class A7, class A8, class A9>
sl@0:   static RET apply(A1& a1, A2& a2, A3& a3, A4& a4, A5& a5, A6& a6, A7& a7, 
sl@0:                    A8& a8, A9& a9) {
sl@0:     return function_adaptor<typename boost::remove_cv<A1>::type>::
sl@0:       template apply<RET>(a1, a2, a3, a4, a5, a6, a7, a8, a9);
sl@0:   }
sl@0: };
sl@0: 
sl@0: template<class T> class function_action<10, T> {
sl@0: public:
sl@0:   template<class RET, class A1, class A2, class A3, class A4, class A5, 
sl@0:            class A6, class A7, class A8, class A9, class A10>
sl@0:   static RET apply(A1& a1, A2& a2, A3& a3, A4& a4, A5& a5, A6& a6, A7& a7, 
sl@0:                    A8& a8, A9& a9, A10& a10) {
sl@0:     return function_adaptor<typename boost::remove_cv<A1>::type>::
sl@0:       template apply<RET>(a1, a2, a3, a4, a5, a6, a7, a8, a9, a10);
sl@0:   }
sl@0: };
sl@0: 
sl@0: } // namespace lambda
sl@0: } // namespace boost
sl@0: 
sl@0: #endif