ardour/ardour
ardour/ardour
13
1
Fork 0
Code Pull Requests Releases Activity

Add API to modify Lua Metatable and set Metamethods

Browse Source 
This allows to map C++ operators to be used as Lua
arithmetic and relational operations.
This commit is contained in:
Robin Gareus 2022-01-24 05:59:27 +01:00
parent 00aec4f91e
commit d51a1ccd99
Signed by: rgareus
GPG Key ID: A090BCE02CF57F04
1 changed files with 46 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

46
libs/lua/LuaBridge/detail/Namespace.h
View File

@ -745,6 +745,52 @@ private:
}
#endif
/**
Add or replace a Metatable Metamethod calling a lua_CFunction.
*/
Class <T>& addOperator (char const* name, int (*const fp)(lua_State*))
{
/* get metatable */
lua_rawgetp (L, LUA_REGISTRYINDEX, ClassInfo <T>::getClassKey ());
lua_pushcfunction (L, fp);
rawsetfield (L, -2, name);
lua_pop (L, 1);
/* reset stack */
lua_pop (L, 3);
lua_rawgetp (L, LUA_REGISTRYINDEX, ClassInfo <T>::getStaticKey ());
rawgetfield (L, -1, "__class");
rawgetfield (L, -1, "__const");
lua_insert (L, -3);
lua_insert (L, -2);
return *this;
}
/**
Add or replace a Metamethod Metamethod, evaluate a const class-member method
*/
template <class FP>
Class <T>& addMetamethod (char const* name, FP const fp)
{
/* get metatable */
lua_rawgetp (L, LUA_REGISTRYINDEX, ClassInfo <T>::getClassKey ());
new (lua_newuserdata (L, sizeof (FP))) FP (fp);
lua_pushcclosure (L, &CFunc::CallConstMember <FP>::f, 1);
rawsetfield (L, -2, name);
lua_pop (L, 1);
/* reset stack */
lua_pop (L, 3);
lua_rawgetp (L, LUA_REGISTRYINDEX, ClassInfo <T>::getStaticKey ());
rawgetfield (L, -1, "__class");
rawgetfield (L, -1, "__const");
lua_insert (L, -3);
lua_insert (L, -2);
return *this;
}
//--------------------------------------------------------------------------
/**
Add or replace a static member function.