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Work around a msvc issue with spurious specialization ambiguity errors.

develop
Alexander Gavrilov 2012-03-26 10:46:51 +04:00
parent 1a19e17695
commit 00a5bfcf3e
1 changed files with 18 additions and 5 deletions
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23
library/include/DataFuncs.h
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@ -33,7 +33,18 @@ distribution.
#include "LuaWrapper.h"
namespace df {
template<class T> struct function_wrapper {};
// A very simple and stupid implementation of some stuff from boost
template<class U, class V> struct is_same_type { static const bool value = false; };
template<class T> struct is_same_type<T,T> { static const bool value = true; };
template<class T> struct return_type {};
/*
* Workaround for a msvc bug suggested by:
*
* http://stackoverflow.com/questions/5110529/class-template-partial-specialization-parametrized-on-member-function-return-typ
*/
template<class T, bool isvoid = is_same_type<typename return_type<T>::type,void>::value>
struct function_wrapper {};
/*
* Since templates can't match variable arg count,
@ -54,23 +65,25 @@ namespace df {
type v##type; df::identity_traits<type>::get()->lua_write(state, UPVAL_METHOD_NAME, &v##type, base++);
#define INSTANTIATE_WRAPPERS(Count, FArgs, Args, Loads) \
template<FW_TARGS> struct function_wrapper<void (*) FArgs> { \
template<FW_TARGSC class RT> struct return_type<RT (*) FArgs> { typedef RT type; }; \
template<FW_TARGSC class RT, class CT> struct return_type<RT (CT::*) FArgs> { typedef RT type; }; \
template<FW_TARGS> struct function_wrapper<void (*) FArgs, true> { \
static const bool is_method = false; \
static const int num_args = Count; \
static void execute(lua_State *state, int base, void (*cb) FArgs) { Loads; INVOKE_VOID(cb Args); } \
}; \
template<FW_TARGSC class RT> struct function_wrapper<RT (*) FArgs> { \
template<FW_TARGSC class RT> struct function_wrapper<RT (*) FArgs, false> { \
static const bool is_method = false; \
static const int num_args = Count; \
static void execute(lua_State *state, int base, RT (*cb) FArgs) { Loads; INVOKE_RV(cb Args); } \
}; \
template<FW_TARGSC class CT> struct function_wrapper<void (CT::*) FArgs> { \
template<FW_TARGSC class CT> struct function_wrapper<void (CT::*) FArgs, true> { \
static const bool is_method = true; \
static const int num_args = Count+1; \
static void execute(lua_State *state, int base, void (CT::*cb) FArgs) { \
LOAD_CLASS() Loads; INVOKE_VOID((self->*cb) Args); } \
}; \
template<FW_TARGSC class RT, class CT> struct function_wrapper<RT (CT::*) FArgs> { \
template<FW_TARGSC class RT, class CT> struct function_wrapper<RT (CT::*) FArgs, false> { \
static const bool is_method = true; \
static const int num_args = Count+1; \
static void execute(lua_State *state, int base, RT (CT::*cb) FArgs) { \