luabind/copy_policy.hpp

   1 // Copyright Daniel Wallin 2008. Use, modification and distribution is
   2 // subject to the Boost Software License, Version 1.0. (See accompanying
   3 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   4
   5 #ifndef LUABIND_COPY_POLICY_081021_HPP
   6 # define LUABIND_COPY_POLICY_081021_HPP
   7
   8 # include <luabind/detail/policy.hpp>
   9
  10 namespace luabind {
  11
  12 namespace detail
  13 {
  14
  15   struct copy_converter
  16   {
  17       template <class T>
  18       void apply(lua_State* L, T const& x)
  19       {
  20           value_converter().apply(L, x);
  21       }
  22
  23       template <class T>
  24       void apply(lua_State* L, T* x)
  25       {
  26           if (!x)
  27               lua_pushnil(L);
  28           else
  29               apply(L, *x);
  30       }
  31   };
  32
  33   template <int N>
  34   struct copy_policy : conversion_policy<N>
  35   {
  36       static void precall(lua_State*, index_map const&)
  37       {}
  38
  39       static void postcall(lua_State*, index_map const&)
  40       {}
  41
  42       template <class T, class Direction>
  43       struct apply
  44       {
  45           typedef copy_converter type;
  46       };
  47   };
  48
  49 } // namespace detail
  50
  51 template <int N>
  52 detail::policy_cons<detail::copy_policy<N>, detail::null_type>
  53 copy(LUABIND_PLACEHOLDER_ARG(N))
  54 {
  55     return detail::policy_cons<detail::copy_policy<N>, detail::null_type>();
  56 }
  57
  58 } // namespace luabind
  59
  60 #endif // LUABIND_COPY_POLICY_081021_HPP
  61