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#define SOL_ALL_SAFETIES_ON 1
#include <sol/sol.hpp>
#include "assert.hpp"
// NOTE:
// There are TWO ways to retrieve the "this"
// object from calls, when it comes to constructors and regular member functions
// please pay attention to both: this is a low-level operation!
int main() {
struct thing {
thing(sol::this_state ts) {
lua_State* L = ts;
// references the object that called this function
// in constructors:
sol::stack_object selfobj(L, -1);
// the -1 (NEGATIVE one) above
// means "off the top fo the stack"
// (-1 is the top, -2 is one below, etc...)
// definitely the same
thing& self = selfobj.as<thing>();
c_assert(&self == this);
}
void func(sol::this_state ts) const {
lua_State* L = ts;
// references the object that called this function
// in regular member functions:
sol::stack_object selfobj(L, 1);
// "1" is the bottom of the Lua stack
// 2 is one up, so on and so forth...
thing& self = selfobj.as<thing>();
// definitely the same
c_assert(&self == this);
}
};
sol::state lua;
lua.open_libraries(sol::lib::base);
lua.new_usertype<thing>("thing",
sol::constructors<thing(sol::this_state)>(),
"func", &thing::func
);
lua.script(R"(
obj = thing.new()
obj:func()
)");
return 0;
}
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