53 lines
1.4 KiB
C++
53 lines
1.4 KiB
C++
|
#define SOL_ALL_SAFETIES_ON 1
|
||
|
|
#include <sol/sol.hpp>
|
||
|
|
|
||
|
|
#include <iostream>
|
||
|
|
|
||
|
|
int main() {
|
||
|
|
std::cout << "=== variadic_args ===" << std::endl;
|
||
|
|
|
||
|
|
sol::state lua;
|
||
|
|
lua.open_libraries(sol::lib::base);
|
||
|
|
|
||
|
|
// another function, which doubles the argument
|
||
|
|
lua.script("function doubler (x) return x * 2 end");
|
||
|
|
sol::protected_function doubler = lua["doubler"];
|
||
|
|
|
||
|
|
// Function requires 2 arguments
|
||
|
|
// rest can be variadic, but:
|
||
|
|
// va will include everything after "a" argument,
|
||
|
|
// which means "b" will be part of the varaidic_args list
|
||
|
|
// too at position 0
|
||
|
|
lua.set_function("v",
|
||
|
|
[doubler](int a, sol::variadic_args va, int /*b*/) {
|
||
|
|
int r = 0;
|
||
|
|
for (auto v : va) {
|
||
|
|
int value = doubler(
|
||
|
|
v); // pass directly to Lua as well!
|
||
|
|
r += value;
|
||
|
|
}
|
||
|
|
// Only have to add a, b was included from
|
||
|
|
// variadic_args and beyond use explicit "call"
|
||
|
|
// syntax to return exactly an integer! this is
|
||
|
|
// useful for ambiguous operator overloads in C++
|
||
|
|
// and other shenanigans
|
||
|
|
return r + a;
|
||
|
|
});
|
||
|
|
|
||
|
|
lua.script("x = v(25, 25)");
|
||
|
|
lua.script("x2 = v(25, 25, 100, 50, 250, 150)");
|
||
|
|
lua.script("x3 = v(1, 2, 3, 4, 5, 6)");
|
||
|
|
// will error: not enough arguments!
|
||
|
|
// lua.script("x4 = v(1)");
|
||
|
|
|
||
|
|
lua.script("assert(x == 75)");
|
||
|
|
lua.script("assert(x2 == 1175)");
|
||
|
|
lua.script("assert(x3 == 41)");
|
||
|
|
lua.script("print(x)");
|
||
|
|
lua.script("print(x2)");
|
||
|
|
lua.script("print(x3)");
|
||
|
|
|
||
|
|
std::cout << std::endl;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|