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