luabind/detail/primitives.hpp

   1 // Copyright (c) 2003 Daniel Wallin and Arvid Norberg
   2
   3 // Permission is hereby granted, free of charge, to any person obtaining a
   4 // copy of this software and associated documentation files (the "Software"),
   5 // to deal in the Software without restriction, including without limitation
   6 // the rights to use, copy, modify, merge, publish, distribute, sublicense,
   7 // and/or sell copies of the Software, and to permit persons to whom the
   8 // Software is furnished to do so, subject to the following conditions:
   9
  10 // The above copyright notice and this permission notice shall be included
  11 // in all copies or substantial portions of the Software.
  12
  13 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
  14 // ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
  15 // TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
  16 // PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
  17 // SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
  18 // ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  19 // ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  20 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
  21 // OR OTHER DEALINGS IN THE SOFTWARE.
  22
  23
  24 #ifndef LUABIND_PRIMITIVES_HPP_INCLUDED
  25 #define LUABIND_PRIMITIVES_HPP_INCLUDED
  26
  27 #include <algorithm>
  28 #include <cstring>
  29
  30 #include <luabind/config.hpp>
  31 #include <luabind/detail/yes_no.hpp>
  32
  33 namespace luabind { namespace detail
  34 {
  35         template<class T>
  36         struct identity
  37         {
  38                 typedef T type;
  39         };
  40
  41         template<class T>
  42     struct type_ {};
  43
  44         struct null_type {};
  45
  46 /*      typedef char yes_t;
  47         typedef double no_t;*/
  48
  49         struct lua_to_cpp {};
  50         struct cpp_to_lua {};
  51
  52         template<class T> struct by_value {};
  53         template<class T> struct by_reference {};
  54         template<class T> struct by_const_reference {};
  55         template<class T> struct by_pointer {};
  56         template<class T> struct by_const_pointer {};
  57
  58         struct converter_policy_tag {};
  59
  60         struct ltstr
  61         {
  62                 bool operator()(const char* s1, const char* s2) const { return std::strcmp(s1, s2) < 0; }
  63         };
  64
  65         inline char* dup_string(const char* s)
  66         {
  67                 std::size_t l = std::strlen(s);
  68                 char* c = new char[l+1];
  69                 std::copy(s, s+l+1, c);
  70                 return c;
  71         }
  72
  73         template<int N>
  74         struct aligned
  75         {
  76                 char storage[N];
  77         };
  78
  79         // returns the offset added to a Derived* when cast to a Base*
  80         // TODO: return ptrdiff
  81         template<class Derived, class Base>
  82         int ptr_offset(type_<Derived>, type_<Base>)
  83         {
  84                 aligned<sizeof(Derived)> obj;
  85                 Derived* ptr = reinterpret_cast<Derived*>(&obj);
  86
  87                 return int(static_cast<char*>(static_cast<void*>(static_cast<Base*>(ptr)))
  88                 - static_cast<char*>(static_cast<void*>(ptr)));
  89         }
  90
  91 }}
  92
  93 #endif // LUABIND_PRIMITIVES_HPP_INCLUDED