Re: Interesting C++ way to allocate user data (placement new)

[Patrick Rapin <toupie300@...>]

> Just wanted to share this idea:
>
> void * operator new( size_t size , lua_State * L )
> {
>   return lua_newuserdata( L , size );
> }
> Foo * foo = new ( L ) Foo( constructor arguments );

Nice idea. It is a cleaner replacement to the more common idiom:
Foo * obj = new(lua_newuserdata(L, sizeof(Foo )) Foo (constructor arguments );

One could then get a step further and specify the metatable registry
name typically associated with the userdata.

void * operator new( size_t size , lua_State * L, const char* metaname )
{
  void* obj = lua_newuserdata( L , size );
  luaL_getmetatable(L, metaname);
  lua_setmetatable(L, -2);
  return obj;
}

So:
Foo * foo = new ( L, "FooMetatable" ) Foo( constructor arguments );