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_YIELD_POLICY_HPP_INCLUDED
25 #define LUABIND_YIELD_POLICY_HPP_INCLUDED
26 
27 #include <luabind/config.hpp>
28 #include <luabind/detail/policy.hpp>
29 
30 namespace luabind { namespace detail
31 {
32 	struct yield_policy
33 	{
precallluabind::detail::yield_policy34 		static void precall(lua_State*, const index_map&) {}
postcallluabind::detail::yield_policy35 		static void postcall(lua_State*, const index_map&) {}
36 	};
37 
38 	template<class T>
39 	struct has_yield
40 	{
41 		BOOST_STATIC_CONSTANT(bool,
42 			value = (boost::is_same<yield_policy, typename T::head>::value ||
43 					  has_yield<typename T::tail>::value));
44 	};
45 
46 	template<>
47 	struct has_yield<null_type>
48 	{
49 		BOOST_STATIC_CONSTANT(bool, value = false);
50 	};
51 }}
52 
53 namespace luabind
54 {
55   detail::policy_cons<detail::yield_policy, detail::null_type> const yield = {};
56 
57   namespace detail
58   {
ignore_unused_yield()59     inline void ignore_unused_yield()
60     {
61         (void)yield;
62     }
63   }
64 }
65 
66 #endif // LUABIND_YIELD_POLICY_HPP_INCLUDED
67 
68