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100 lines
3.5 KiB
C++
100 lines
3.5 KiB
C++
// Copyright (c) 2003 Daniel Wallin and Arvid Norberg
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the "Software"),
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// to deal in the Software without restriction, including without limitation
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// the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// and/or sell copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following conditions:
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// The above copyright notice and this permission notice shall be included
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// in all copies or substantial portions of the Software.
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
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// ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
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// TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
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// PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
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// SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
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// ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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// ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
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// OR OTHER DEALINGS IN THE SOFTWARE.
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#ifndef LUABIND_DEPENDENCY_POLICY_HPP_INCLUDED
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#define LUABIND_DEPENDENCY_POLICY_HPP_INCLUDED
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#include <luabind/config.hpp>
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#include <luabind/detail/policy.hpp> // for policy_cons, etc
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#include <luabind/detail/object_rep.hpp> // for object_rep
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#include <luabind/detail/primitives.hpp> // for null_type
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namespace luabind {
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namespace detail {
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// makes A dependent on B, meaning B will outlive A.
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// internally A stores a reference to B
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template<int A, int B>
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struct dependency_policy
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{
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template< unsigned int... StackIndices >
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static void postcall(lua_State* L, int results, meta::index_list<StackIndices...>)
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{
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object_rep* nurse = static_cast<object_rep*>(lua_touserdata(L, meta::get<meta::index_list<StackIndices...>, A>::value));
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// If the nurse isn't an object_rep, just make this a nop.
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if(nurse == 0)
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return;
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nurse->add_dependency(L, meta::get<meta::index_list<StackIndices...>, B>::value);
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}
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};
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template<int B>
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struct dependency_policy<0, B>
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{
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template< unsigned int... StackIndices >
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static void postcall(lua_State* L, int results, meta::index_list<StackIndices...>)
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{
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object_rep* nurse = static_cast<object_rep*>(lua_touserdata(L, meta::get<meta::index_list<StackIndices...>, 0>::value + results));
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// If the nurse isn't an object_rep, just make this a nop.
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if(nurse == 0)
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return;
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nurse->add_dependency(L, meta::get<meta::index_list<StackIndices...>, B>::value);
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}
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};
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template<int A>
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struct dependency_policy<A, 0>
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{
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template< unsigned int... StackIndices >
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static void postcall(lua_State* L, int results, meta::index_list<StackIndices...>)
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{
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object_rep* nurse = static_cast<object_rep*>(lua_touserdata(L, meta::get<meta::index_list<StackIndices...>, A>::value));
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// If the nurse isn't an object_rep, just make this a nop.
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if(nurse == 0)
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return;
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nurse->add_dependency(L, meta::get<meta::index_list<StackIndices...>, 0>::value + results);
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}
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};
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}
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}
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namespace luabind
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{
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// Caution: If we use the aliased type "policy_list" here, MSVC crashes.
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template<unsigned int A, unsigned int B>
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using dependency_policy = meta::type_list<call_policy_injector<detail::dependency_policy<A, B>>>;
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template<unsigned int A>
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using return_internal_reference = meta::type_list<call_policy_injector<detail::dependency_policy<0, A>>>;
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}
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#endif // LUABIND_DEPENDENCY_POLICY_HPP_INCLUDED
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