function/include/boost/function.hpp

// Boost.Function library

// Copyright (C) 2001 Doug Gregor (gregod@cs.rpi.edu)
//
// Permission to copy, use, sell and distribute this software is granted
// provided this copyright notice appears in all copies.
// Permission to modify the code and to distribute modified code is granted
// provided this copyright notice appears in all copies, and a notice
// that the code was modified is included with the copyright notice.
//
// This software is provided "as is" without express or implied warranty,
// and with no claim as to its suitability for any purpose.
 
// For more information, see http://www.boost.org
 
// William Kempf, Jesse Jones and Karl Nelson were all very helpful in the
// design of this library.

#ifndef BOOST_FUNCTION_HPP
#define BOOST_FUNCTION_HPP

#include <boost/function/function_base.hpp>
#include <boost/function/function0.hpp>
#include <boost/function/function1.hpp>
#include <boost/function/function2.hpp>
#include <boost/function/function3.hpp>
#include <boost/function/function4.hpp>
#include <boost/function/function5.hpp>
#include <boost/function/function6.hpp>
#include <boost/function/function7.hpp>
#include <boost/function/function8.hpp>
#include <boost/function/function9.hpp>
#include <boost/function/function10.hpp>

namespace boost {
  namespace detail {
    namespace function {
      // Choose the appropriate underlying implementation
      template<int Args> struct real_get_function_impl {};

      template<>
      struct real_get_function_impl<0>
      {
        template<
          typename R, 
          typename T1,
          typename T2,
          typename T3,
          typename T4,
          typename T5,
          typename T6,
          typename T7,
          typename T8,
          typename T9,
          typename T10,
          typename Policy = empty_function_policy,
          typename Mixin = empty_function_mixin,
          typename Allocator = std::allocator<function_base>
        >
        struct params
        {
          typedef function0<R, Policy, Mixin, Allocator> type;
        };
      };

      template<>
      struct real_get_function_impl<1>
      {
        template<
          typename R, 
          typename T1,
          typename T2,
          typename T3,
          typename T4,
          typename T5,
          typename T6,
          typename T7,
          typename T8,
          typename T9,
          typename T10,
          typename Policy = empty_function_policy,
          typename Mixin = empty_function_mixin,
          typename Allocator = std::allocator<function_base>
        >
        struct params
        {
          typedef function1<R, T1, Policy, Mixin, Allocator> type;
        };
      };

      template<>
      struct real_get_function_impl<2>
      {
        template<
          typename R, 
          typename T1,
          typename T2,
          typename T3,
          typename T4,
          typename T5,
          typename T6,
          typename T7,
          typename T8,
          typename T9,
          typename T10,
          typename Policy = empty_function_policy,
          typename Mixin = empty_function_mixin,
          typename Allocator = std::allocator<function_base>
        >
        struct params
        {
          typedef function2<R, T1, T2, Policy, Mixin, Allocator> type;
        };
      };

      template<>
      struct real_get_function_impl<3>
      {
        template<
          typename R, 
          typename T1,
          typename T2,
          typename T3,
          typename T4,
          typename T5,
          typename T6,
          typename T7,
          typename T8,
          typename T9,
          typename T10,
          typename Policy = empty_function_policy,
          typename Mixin = empty_function_mixin,
          typename Allocator = std::allocator<function_base>
        >
        struct params
        {
          typedef function3<R, T1, T2, T3, Policy, Mixin, Allocator> type;
        };
      };

      template<>
      struct real_get_function_impl<4>
      {
        template<
          typename R, 
          typename T1,
          typename T2,
          typename T3,
          typename T4,
          typename T5,
          typename T6,
          typename T7,
          typename T8,
          typename T9,
          typename T10,
          typename Policy = empty_function_policy,
          typename Mixin = empty_function_mixin,
          typename Allocator = std::allocator<function_base>
        >
        struct params
        {
          typedef function4<R, T1, T2, T3, T4, Policy, Mixin, Allocator> type;
        };
      };

      template<>
      struct real_get_function_impl<5>
      {
        template<
          typename R, 
          typename T1,
          typename T2,
          typename T3,
          typename T4,
          typename T5,
          typename T6,
          typename T7,
          typename T8,
          typename T9,
          typename T10,
          typename Policy = empty_function_policy,
          typename Mixin = empty_function_mixin,
          typename Allocator = std::allocator<function_base>
        >
        struct params
        {
          typedef function5<R, T1, T2, T3, T4, T5, Policy, Mixin, Allocator> 
          type;
        };
      };

      template<>
      struct real_get_function_impl<6>
      {
        template<
          typename R, 
          typename T1,
          typename T2,
          typename T3,
          typename T4,
          typename T5,
          typename T6,
          typename T7,
          typename T8,
          typename T9,
          typename T10,
          typename Policy = empty_function_policy,
          typename Mixin = empty_function_mixin,
          typename Allocator = std::allocator<function_base>
        >
        struct params
        {
          typedef function6<R, T1, T2, T3, T4, T5, T6, Policy, Mixin, Allocator>
          type;
        };
      };

      template<>
      struct real_get_function_impl<7>
      {
        template<
          typename R, 
          typename T1,
          typename T2,
          typename T3,
          typename T4,
          typename T5,
          typename T6,
          typename T7,
          typename T8,
          typename T9,
          typename T10,
          typename Policy = empty_function_policy,
          typename Mixin = empty_function_mixin,
          typename Allocator = std::allocator<function_base>
        >
        struct params
        {
          typedef function7<R, T1, T2, T3, T4, T5, T6, T7, Policy, Mixin, 
                            Allocator> type;
        };
      };

      template<>
      struct real_get_function_impl<8>
      {
        template<
          typename R, 
          typename T1,
          typename T2,
          typename T3,
          typename T4,
          typename T5,
          typename T6,
          typename T7,
          typename T8,
          typename T9,
          typename T10,
          typename Policy = empty_function_policy,
          typename Mixin = empty_function_mixin,
          typename Allocator = std::allocator<function_base>
        >
        struct params
        {
          typedef function8<R, T1, T2, T3, T4, T5, T6, T7, T8, Policy, Mixin, 
                            Allocator> type;
        };
      };

      template<>
      struct real_get_function_impl<9>
      {
        template<
          typename R, 
          typename T1,
          typename T2,
          typename T3,
          typename T4,
          typename T5,
          typename T6,
          typename T7,
          typename T8,
          typename T9,
          typename T10,
          typename Policy = empty_function_policy,
          typename Mixin = empty_function_mixin,
          typename Allocator = std::allocator<function_base>
        >
        struct params
        {
          typedef function9<R, T1, T2, T3, T4, T5, T6, T7, T8, T9, Policy, 
                            Mixin, Allocator> type;
        };
      };

      template<>
      struct real_get_function_impl<10>
      {
        template<
          typename R, 
          typename T1,
          typename T2,
          typename T3,
          typename T4,
          typename T5,
          typename T6,
          typename T7,
          typename T8,
          typename T9,
          typename T10,
          typename Policy = empty_function_policy,
          typename Mixin = empty_function_mixin,
          typename Allocator = std::allocator<function_base>
        >
        struct params
        {
          typedef function10<R, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, 
                             Policy, Mixin, Allocator> type;
        };
      };

      template<
        typename R, 
        typename T1, 
        typename T2, 
        typename T3, 
        typename T4,
        typename T5, 
        typename T6, 
        typename T7, 
        typename T8, 
        typename T9,
        typename T10,
        typename Policy = empty_function_policy,
        typename Mixin = empty_function_mixin,
        typename Allocator = std::allocator<function_base> 
      >
      struct get_function_impl
      {
        typedef typename real_get_function_impl<
          (count_used_args<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10>::value)
          >::template params<R, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, 
                             Policy, Mixin, Allocator>::type
        type;
      };

  template<
    typename R, 
    typename T1, 
    typename T2, 
    typename T3, 
    typename T4,
    typename T5, 
    typename T6, 
    typename T7, 
    typename T8, 
    typename T9,
    typename T10,
    typename MyPolicy = empty_function_policy,
    typename MyMixin = empty_function_mixin,
    typename MyAllocator = std::allocator<function_base> 
  >
  struct function_traits_builder
  {
    typedef typename get_function_impl<R, T1, T2, T3, T4, T5, T6, T7, 
                                       T8, T9, T10, MyPolicy, MyMixin, 
                                       MyAllocator>::type
      type;

    typedef MyPolicy    policy_type;
    typedef MyMixin     mixin_type;
    typedef MyAllocator allocator_type;

#ifndef BOOST_NO_DEPENDENT_NESTED_DERIVATIONS
    template<typename Policy>
    struct policy : 
        public function_traits_builder<R, T1, T2, T3, T4, T5, T6, T7, T8, T9,
                                       T10, Policy, mixin_type, 
                                       allocator_type> {};

    template<typename Mixin>
    struct mixin : 
        public function_traits_builder<R, T1, T2, T3, T4, T5, T6, T7, T8, T9,
                                       T10, policy_type, Mixin, 
                                       allocator_type> {};

    template<typename Allocator>
    struct allocator : 
        public function_traits_builder<R, T1, T2, T3, T4, T5, T6, T7, T8, T9,
                                       T10, policy_type, mixin_type, 
                                       Allocator> {};
#else
    template<typename Policy>
    struct policy 
    {
      typedef typename function_traits_builder<R, T1, T2, T3, T4, T5, T6, T7,
                                               T8, T9, T10, Policy, 
                                               mixin_type, 
                                               allocator_type>::type
        type;
    };

    template<typename Mixin>
    struct mixin
    {
      typedef typename function_traits_builder<R, T1, T2, T3, T4, T5, T6, T7,
                                               T8, T9, T10, policy_type, Mixin,
                                               allocator_type>::type
        type;
    };

    template<typename Allocator>
    struct allocator
    {
      typedef typename function_traits_builder<R, T1, T2, T3, T4, T5, T6, T7,
                                               T8, T9, T10, policy_type, 
                                               mixin_type, Allocator>::type
        type;
    };
#endif
  };

    } // end namespace function
  } // end namespace detail

  template<
    typename R, 
    typename T1 = detail::function::unusable, 
    typename T2 = detail::function::unusable,
    typename T3 = detail::function::unusable,
    typename T4 = detail::function::unusable,
    typename T5 = detail::function::unusable,
    typename T6 = detail::function::unusable,
    typename T7 = detail::function::unusable,
    typename T8 = detail::function::unusable,
    typename T9 = detail::function::unusable,
    typename T10 = detail::function::unusable
  >
  class function :
    public detail::function::get_function_impl<R, T1, T2, T3, T4, T5, T6, T7, 
                                               T8, T9, T10>::type,
    public detail::function::function_traits_builder<R, T1, T2, T3, T4, T5, T6,
                                                     T7, T8, T9, T10>
  {
    typedef typename detail::function::get_function_impl<R, T1, T2, T3, T4, T5,
                                                         T6, T7, T8, T9, T10
                                                         >::type 
      base_type;

  public:
    typedef typename base_type::policy_type policy_type;
    typedef typename base_type::mixin_type mixin_type;
    typedef typename base_type::allocator_type allocator_type;              
    typedef function self_type;                                     
                                                                            
    function() : base_type() {}                                     
                                                                            
    template<typename Functor>                                              
    function(const Functor& f) : base_type(f) {}
                      
#ifdef __BORLANDC__
    template<typename Functor> function(Functor* f) : base_type(f) {}
#endif // __BORLANDC__

    function(const self_type& f) : base_type(static_cast<const base_type&>(f)){}
         
    template<typename Functor>
    function& operator=(const Functor& f)
    {
      self_type(f).swap(*this);
      return *this;
    }

#ifdef __BORLANDC__
    template<typename Functor>
    self_type& operator=(Functor* f)
    {
      self_type(f).swap(*this);
      return *this;
    }
#endif // __BORLANDC__

    self_type& operator=(const base_type& f)
    {
      self_type(f).swap(*this);
      return *this;
    }

    self_type& operator=(const self_type& f)                                  
    {   
      self_type(f).swap(*this);
      return *this;                                                         
    }                                                           

    template<typename Functor>
    void set(const Functor& f)
    {
      self_type(f).swap(*this);
    }

#ifdef __BORLANDC__
    template<typename Functor>
    void set(Functor* f)
    {
      self_type(f).swap(*this);
    }
#endif // __BORLANDC__
 
    void set(const base_type& f)
    {
      self_type(f).swap(*this);
    }

    void set(const self_type& f)                             
    {
      self_type(f).swap(*this);
    }   
  };

  template<typename R,
           typename T1, 
           typename T2,
           typename T3,
           typename T4,
           typename T5,
           typename T6,
           typename T7,
           typename T8,
           typename T9,
           typename T10>
  inline void swap(function<R, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10>& f1,
                   function<R, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10>& f2)
  {
    f1.swap(f2);
  }
}

#endif