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