1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
|
#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;
}
|
