boost/utility/in_place_factory.hpp

   1 // Copyright (C) 2003, Fernando Luis Cacciola Carballal.
   2 // Copyright (C) 2007, Tobias Schwinger.
   3 //
   4 // Use, modification, and distribution is subject to the Boost Software
   5 // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
   6 // http://www.boost.org/LICENSE_1_0.txt)
   7 //
   8 // See http://www.boost.org/lib/optional for documentation.
   9 //
  10 // You are welcome to contact the author at:
  11 //  fernando_cacciola@hotmail.com
  12 //
  13 #ifndef BOOST_UTILITY_INPLACE_FACTORY_04APR2007_HPP
  14 #ifndef BOOST_PP_IS_ITERATING
  15
  16 #include <boost/utility/detail/in_place_factory_prefix.hpp>
  17
  18 namespace boost {
  19
  20 class in_place_factory_base {} ;
  21
  22 #define  BOOST_PP_ITERATION_LIMITS (0, BOOST_MAX_INPLACE_FACTORY_ARITY)
  23 #define  BOOST_PP_FILENAME_1 <boost/utility/in_place_factory.hpp>
  24 #include BOOST_PP_ITERATE()
  25
  26 } // namespace boost
  27
  28 #include <boost/utility/detail/in_place_factory_suffix.hpp>
  29
  30 #define BOOST_UTILITY_INPLACE_FACTORY_04APR2007_HPP
  31 #else
  32 #define N BOOST_PP_ITERATION()
  33
  34 #if N
  35 template< BOOST_PP_ENUM_PARAMS(N, class A) >
  36 #endif
  37 class BOOST_PP_CAT(in_place_factory,N)
  38   :
  39   public in_place_factory_base
  40 {
  41 public:
  42
  43   explicit BOOST_PP_CAT(in_place_factory,N)
  44       ( BOOST_PP_ENUM_BINARY_PARAMS(N,A,const& a) )
  45 #if N > 0
  46     : BOOST_PP_ENUM(N, BOOST_DEFINE_INPLACE_FACTORY_CLASS_MEMBER_INIT, _)
  47 #endif
  48   {}
  49
  50   template<class T>
  51   void* apply(void* address
  52       BOOST_APPEND_EXPLICIT_TEMPLATE_TYPE(T)) const
  53   {
  54     return new(address) T( BOOST_PP_ENUM_PARAMS(N, m_a) );
  55   }
  56
  57   template<class T>
  58   void* apply(void* address, std::size_t n
  59       BOOST_APPEND_EXPLICIT_TEMPLATE_TYPE(T)) const
  60   {
  61     for(char* next = address = this->BOOST_NESTED_TEMPLATE apply<T>(address);
  62         !! --n;)
  63       this->BOOST_NESTED_TEMPLATE apply<T>(next = next+sizeof(T));
  64     return address;
  65   }
  66
  67   BOOST_PP_REPEAT(N, BOOST_DEFINE_INPLACE_FACTORY_CLASS_MEMBER_DECL, _)
  68 };
  69
  70 #if N > 0
  71 template< BOOST_PP_ENUM_PARAMS(N, class A) >
  72 inline BOOST_PP_CAT(in_place_factory,N)< BOOST_PP_ENUM_PARAMS(N, A) >
  73 in_place( BOOST_PP_ENUM_BINARY_PARAMS(N, A, const& a) )
  74 {
  75   return BOOST_PP_CAT(in_place_factory,N)< BOOST_PP_ENUM_PARAMS(N, A) >
  76       ( BOOST_PP_ENUM_PARAMS(N, a) );
  77 }
  78 #else
  79 inline in_place_factory0 in_place()
  80 {
  81   return in_place_factory0();
  82 }
  83 #endif
  84
  85 #undef N
  86 #endif
  87 #endif
  88