Chris@16: // -- Boost Lambda Library - actions.hpp ----------------------------------
Chris@16: 
Chris@16: // Copyright (C) 1999, 2000 Jaakko Jarvi (jaakko.jarvi@cs.utu.fi)
Chris@16: //
Chris@16: // Distributed under the Boost Software License, Version 1.0. (See
Chris@16: // accompanying file LICENSE_1_0.txt or copy at
Chris@16: // http://www.boost.org/LICENSE_1_0.txt)
Chris@16: 
Chris@16: // For more information, see www.boost.org
Chris@16: 
Chris@16: // ----------------------------------------------------------------
Chris@16: 
Chris@16: #ifndef BOOST_LAMBDA_ACTIONS_HPP
Chris@16: #define BOOST_LAMBDA_ACTIONS_HPP
Chris@16: 
Chris@16: namespace boost { 
Chris@16: namespace lambda {
Chris@16: 
Chris@16: 
Chris@16: 
Chris@16: template<int Arity, class Act> class action;
Chris@16: 
Chris@16: // these need to be defined here, since the corresponding lambda 
Chris@16: // functions are members of lambda_functor classes
Chris@16: 
Chris@16: class assignment_action {};
Chris@16: class subscript_action {};
Chris@16: 
Chris@16: template <class Action> class other_action;
Chris@16: 
Chris@16: // action for specifying the explicit return type
Chris@16: template <class RET> class explicit_return_type_action {};
Chris@16: 
Chris@16: // action for preventing the expansion of a lambda expression
Chris@16: struct protect_action {};
Chris@16: 
Chris@16:   // must be defined here, comma is a special case
Chris@16: struct comma_action {};
Chris@16: 
Chris@16: 
Chris@16:   // actions, for which the existence of protect is checked in return type 
Chris@16:   // deduction.
Chris@16: 
Chris@16: template <class Action> struct is_protectable {
Chris@16:   BOOST_STATIC_CONSTANT(bool, value = false);
Chris@16: };
Chris@16: 
Chris@16: // NOTE: comma action is protectable. Other protectable actions
Chris@16: // are listed in operator_actions.hpp
Chris@16: 
Chris@16: template<> struct is_protectable<other_action<comma_action> > {
Chris@16:   BOOST_STATIC_CONSTANT(bool, value = true);
Chris@16: };
Chris@16: 
Chris@16: 
Chris@16: namespace detail {
Chris@16: 
Chris@16:   // this type is used in return type deductions to signal that deduction 
Chris@16:   // did not find a result. It does not necessarily mean an error, it commonly
Chris@16:   // means that something else should be tried.
Chris@16:   class unspecified {};
Chris@16: }
Chris@16: 
Chris@16:   // function action is a special case: bind functions can be called with 
Chris@16:   // the return type specialized explicitly e.g. bind<int>(foo);
Chris@16:   // If this call syntax is used, the return type is stored in the latter
Chris@16:   // argument of function_action template. Otherwise the argument gets the type
Chris@16:   // 'unspecified'.
Chris@16:   // This argument is only relevant in the return type deduction code
Chris@16: template <int I, class Result_type = detail::unspecified> 
Chris@16: class function_action {};
Chris@16:    
Chris@16: template<class T> class function_action<1, T> {
Chris@16: public:
Chris@16:   template<class RET, class A1>
Chris@16:   static RET apply(A1& a1) {
Chris@16:     return function_adaptor<typename boost::remove_cv<A1>::type>::
Chris@16:       template apply<RET>(a1);
Chris@16:   }
Chris@16: };
Chris@16: 
Chris@16: template<class T> class function_action<2, T> {
Chris@16: public:
Chris@16:   template<class RET, class A1, class A2>
Chris@16:   static RET apply(A1& a1, A2& a2) {
Chris@16:     return function_adaptor<typename boost::remove_cv<A1>::type>::
Chris@16:       template apply<RET>(a1, a2);
Chris@16:   }
Chris@16: };
Chris@16: 
Chris@16: template<class T> class function_action<3, T> {
Chris@16: public:
Chris@16:   template<class RET, class A1, class A2, class A3>
Chris@16:   static RET apply(A1& a1, A2& a2, A3& a3) {
Chris@16:     return function_adaptor<typename boost::remove_cv<A1>::type>::
Chris@16:       template apply<RET>(a1, a2, a3);
Chris@16:   }
Chris@16: };
Chris@16: 
Chris@16: template<class T> class function_action<4, T> {
Chris@16: public:
Chris@16:   template<class RET, class A1, class A2, class A3, class A4>
Chris@16:   static RET apply(A1& a1, A2& a2, A3& a3, A4& a4) {
Chris@16:     return function_adaptor<typename boost::remove_cv<A1>::type>::
Chris@16:       template apply<RET>(a1, a2, a3, a4);
Chris@16:   }
Chris@16: };
Chris@16: 
Chris@16: template<class T> class function_action<5, T> {
Chris@16: public:
Chris@16:   template<class RET, class A1, class A2, class A3, class A4, class A5>
Chris@16:   static RET apply(A1& a1, A2& a2, A3& a3, A4& a4, A5& a5) {
Chris@16:     return function_adaptor<typename boost::remove_cv<A1>::type>::
Chris@16:       template apply<RET>(a1, a2, a3, a4, a5);
Chris@16:   }
Chris@16: };
Chris@16: 
Chris@16: template<class T> class function_action<6, T> {
Chris@16: public:
Chris@16:   template<class RET, class A1, class A2, class A3, class A4, class A5, 
Chris@16:            class A6>
Chris@16:   static RET apply(A1& a1, A2& a2, A3& a3, A4& a4, A5& a5, A6& a6) {
Chris@16:     return function_adaptor<typename boost::remove_cv<A1>::type>::
Chris@16:       template apply<RET>(a1, a2, a3, a4, a5, a6);
Chris@16:   }
Chris@16: };
Chris@16: 
Chris@16: template<class T> class function_action<7, T> {
Chris@16: public:
Chris@16:   template<class RET, class A1, class A2, class A3, class A4, class A5,  
Chris@16:            class A6, class A7>
Chris@16:   static RET apply(A1& a1, A2& a2, A3& a3, A4& a4, A5& a5, A6& a6, A7& a7) {
Chris@16:     return function_adaptor<typename boost::remove_cv<A1>::type>::
Chris@16:       template apply<RET>(a1, a2, a3, a4, a5, a6, a7);
Chris@16:   }
Chris@16: };
Chris@16: 
Chris@16: template<class T> class function_action<8, T> {
Chris@16: public:
Chris@16:   template<class RET, class A1, class A2, class A3, class A4, class A5, 
Chris@16:            class A6, class A7, class A8>
Chris@16:   static RET apply(A1& a1, A2& a2, A3& a3, A4& a4, A5& a5, A6& a6, A7& a7, 
Chris@16:                    A8& a8) {
Chris@16:     return function_adaptor<typename boost::remove_cv<A1>::type>::
Chris@16:       template apply<RET>(a1, a2, a3, a4, a5, a6, a7, a8);
Chris@16:   }
Chris@16: };
Chris@16: 
Chris@16: template<class T> class function_action<9, T> {
Chris@16: public:
Chris@16:   template<class RET, class A1, class A2, class A3, class A4, class A5, 
Chris@16:            class A6, class A7, class A8, class A9>
Chris@16:   static RET apply(A1& a1, A2& a2, A3& a3, A4& a4, A5& a5, A6& a6, A7& a7, 
Chris@16:                    A8& a8, A9& a9) {
Chris@16:     return function_adaptor<typename boost::remove_cv<A1>::type>::
Chris@16:       template apply<RET>(a1, a2, a3, a4, a5, a6, a7, a8, a9);
Chris@16:   }
Chris@16: };
Chris@16: 
Chris@16: template<class T> class function_action<10, T> {
Chris@16: public:
Chris@16:   template<class RET, class A1, class A2, class A3, class A4, class A5, 
Chris@16:            class A6, class A7, class A8, class A9, class A10>
Chris@16:   static RET apply(A1& a1, A2& a2, A3& a3, A4& a4, A5& a5, A6& a6, A7& a7, 
Chris@16:                    A8& a8, A9& a9, A10& a10) {
Chris@16:     return function_adaptor<typename boost::remove_cv<A1>::type>::
Chris@16:       template apply<RET>(a1, a2, a3, a4, a5, a6, a7, a8, a9, a10);
Chris@16:   }
Chris@16: };
Chris@16: 
Chris@16: } // namespace lambda
Chris@16: } // namespace boost
Chris@16: 
Chris@16: #endif