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#define SOL_ALL_SAFETIES_ON 1
#include <sol/sol.hpp>
#include <iostream>
struct two_things {
int a;
bool b;
};
template <typename Handler>
bool sol_lua_check(sol::types<two_things>, lua_State* L,
int index, Handler&& handler,
sol::stack::record& tracking) {
// indices can be negative to count backwards from the top
// of the stack, rather than the bottom up to deal with
// this, we adjust the index to its absolute position using
// the lua_absindex function
int absolute_index = lua_absindex(L, index);
// Check first and second second index for being the proper
// types
bool success
= sol::stack::check<int>(L, absolute_index, handler)
&& sol::stack::check<bool>(
L, absolute_index + 1, handler);
tracking.use(2);
return success;
}
two_things sol_lua_get(sol::types<two_things>, lua_State* L,
int index, sol::stack::record& tracking) {
int absolute_index = lua_absindex(L, index);
// Get the first element
int a = sol::stack::get<int>(L, absolute_index);
// Get the second element,
// in the +1 position from the first
bool b = sol::stack::get<bool>(L, absolute_index + 1);
// we use 2 slots, each of the previous takes 1
tracking.use(2);
return two_things { a, b };
}
int sol_lua_push(lua_State* L, const two_things& things) {
int amount = sol::stack::push(L, things.a);
// amount will be 1: int pushes 1 item
amount += sol::stack::push(L, things.b);
// amount 2 now, since bool pushes a single item
// Return 2 things
return amount;
}
int main() {
std::cout << "=== customization ===" << std::endl;
std::cout << std::boolalpha;
sol::state lua;
lua.open_libraries(sol::lib::base);
// Create a pass-through style of function
lua.script(
"function f ( a, b ) print(a, b) return a, b end");
// get the function out of Lua
sol::function f = lua["f"];
two_things things = f(two_things { 24, false });
SOL_ASSERT(things.a == 24);
SOL_ASSERT(things.b == false);
// things.a == 24
// things.b == true
std::cout << "things.a: " << things.a << std::endl;
std::cout << "things.b: " << things.b << std::endl;
std::cout << std::endl;
return 0;
}
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