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

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