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120 lines
3.4 KiB
C++
120 lines
3.4 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>
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namespace luabind { namespace detail
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{
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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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static void postcall(lua_State* L, const index_map& indices)
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{
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int nurse_index = indices[A];
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int patient = indices[B];
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object_rep* nurse = static_cast<object_rep*>(lua_touserdata(L, nurse_index));
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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, patient);
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}
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};
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}}
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#if defined (BOOST_MSVC) && (BOOST_MSVC <= 1200)
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namespace luabind
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{
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// most absurd workaround of all time?
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namespace detail
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{
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template<int N>
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struct size_char_array
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{
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char storage[N + 2];
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};
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template<int N>
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size_char_array<N> deduce_size(LUABIND_PLACEHOLDER_ARG(N));
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template<class T>
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struct get_index_workaround
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{
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static T t;
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BOOST_STATIC_CONSTANT(int, value = sizeof(deduce_size(t)) - 2);
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};
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}
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template<class A, class B>
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detail::policy_cons<detail::dependency_policy<detail::get_index_workaround<A>::value
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, detail::get_index_workaround<B>::value>, detail::null_type> dependency(A,B)
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{
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return detail::policy_cons<detail::dependency_policy<
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detail::get_index_workaround<A>::value, detail::get_index_workaround<B>::value>
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, detail::null_type>();
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}
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template<class A>
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detail::policy_cons<detail::dependency_policy<0
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, detail::get_index_workaround<A>::value>, detail::null_type>
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return_internal_reference(A)
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{
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return detail::policy_cons<detail::dependency_policy<0
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, detail::get_index_workaround<A>::value>, detail::null_type>();
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}
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}
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#else
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namespace luabind
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{
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template<int A, int B>
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detail::policy_cons<detail::dependency_policy<A, B>, detail::null_type>
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dependency(LUABIND_PLACEHOLDER_ARG(A), LUABIND_PLACEHOLDER_ARG(B))
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{
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return detail::policy_cons<detail::dependency_policy<A, B>, detail::null_type>();
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}
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template<int A>
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detail::policy_cons<detail::dependency_policy<0, A>, detail::null_type>
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return_internal_reference(LUABIND_PLACEHOLDER_ARG(A))
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{
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return detail::policy_cons<detail::dependency_policy<0, A>, detail::null_type>();
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}
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}
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#endif
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#endif // LUABIND_DEPENDENCY_POLICY_HPP_INCLUDED
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