Method Payload

tests/test_callbacks.cpp:113–113

    // test_lambda_closure_cleanup
    struct Payload {
        Payload() { print_default_created(this); }
        ~Payload() { print_destroyed(this); }
        Payload(const Payload &) { print_copy_created(this); }
        Payload(Payload &&) noexcept { print_move_created(this); }