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 { operator ()luabind::detail::ltstr62 bool operator()(const char* s1, const char* s2) const { return std::strcmp(s1, s2) < 0; } 63 }; 64 65 template<int N> 66 struct aligned 67 { 68 char storage[N]; 69 }; 70 71 // returns the offset added to a Derived* when cast to a Base* 72 // TODO: return ptrdiff 73 template<class Derived, class Base> ptr_offset(type_<Derived>,type_<Base>)74 int ptr_offset(type_<Derived>, type_<Base>) 75 { 76 aligned<sizeof(Derived)> obj; 77 Derived* ptr = reinterpret_cast<Derived*>(&obj); 78 79 return int(static_cast<char*>(static_cast<void*>(static_cast<Base*>(ptr))) 80 - static_cast<char*>(static_cast<void*>(ptr))); 81 } 82 83 }} 84 85 #endif // LUABIND_PRIMITIVES_HPP_INCLUDED 86