#define SOL_ALL_SAFETIES_ON 1

#include <sol/sol.hpp>

#include <iostream>

struct test {

static int number;

};

int test::number = 25;

int main() {

sol::state lua;

lua.open_libraries();

lua.new_usertype<test>("test",

"direct",

sol::var(2),

"number",

sol::var(test::number),

"ref_number",

sol::var(std::ref(test::number)));

int direct_value = lua["test"]["direct"];

sol_c_assert(direct_value == 2);

int number = lua["test"]["number"];

sol_c_assert(number == 25);

int ref_number = lua["test"]["ref_number"];

sol_c_assert(ref_number == 25);

test::number = 542;

// number is its own memory: was passed by value

// So does not change

int number_again = lua["test"]["number"];

sol_c_assert(number_again == 25);

// ref_number is just test::number

// passed through std::ref

// so, it holds a reference

// which can be updated

int ref_number_again = lua["test"]["ref_number"];

sol_c_assert(ref_number_again == 542);

// be careful about referencing local variables,

// if they go out of scope but are still reference

// you'll suffer dangling reference bugs!

return 0;

}