Method operator()

include/sol/stack_reference.hpp:249–251

		}

		bool operator()(const stateless_stack_reference& lhs, const stateless_stack_reference& rhs) const {
			return lhs.equals(lua_state(), rhs);
		}

		bool operator()(lua_nil_t lhs, const stateless_stack_reference& rhs) const {
			return rhs.equals(lua_state(), lhs);