83 lines
2.2 KiB
C++
83 lines
2.2 KiB
C++
#define SOL_ALL_SAFETIES_ON 1
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#include <sol/sol.hpp>
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#include <tuple>
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#include <iostream>
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int main() {
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std::cout << "=== multi results ===" << std::endl;
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sol::state lua;
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lua.open_libraries(sol::lib::base);
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// multi-return functions are supported using
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// std::tuple as the transfer type,
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// sol::as_returns for containers,
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// and sol::variadic_results for more special things
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lua.set_function("multi_tuple",
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[] { return std::make_tuple(10, "goodbye"); });
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lua.script("print('calling multi_tuple')");
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lua.script("print(multi_tuple())");
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lua.script("x, y = multi_tuple()");
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lua.script("assert(x == 10 and y == 'goodbye')");
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auto multi = lua.get<sol::function>("multi_tuple");
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int first;
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std::string second;
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// tie the values
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sol::tie(first, second) = multi();
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// use the values
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SOL_ASSERT(first == 10);
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SOL_ASSERT(second == "goodbye");
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// sol::as_returns
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// works with any iterable,
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// but we show off std::vector here
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lua.set_function("multi_containers", [](bool add_extra) {
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std::vector<int> values { 55, 66 };
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if (add_extra) {
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values.push_back(77);
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}
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return sol::as_returns(std::move(values));
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});
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lua.script("print('calling multi_containers')");
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lua.script("print(multi_containers(false))");
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lua.script("a, b, c = multi_containers(true)");
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int a = lua["a"];
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int b = lua["b"];
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int c = lua["c"];
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SOL_ASSERT(a == 55);
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SOL_ASSERT(b == 66);
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SOL_ASSERT(c == 77);
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// sol::variadic_results
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// you can push objects of different types
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// note that sol::this_state is a transparent
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// argument: you don't need to pass
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// that state through Lua
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lua.set_function(
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"multi_vars", [](int a, bool b, sol::this_state L) {
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sol::variadic_results values;
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values.push_back(
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{ L, sol::in_place_type<int>, a });
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values.push_back(
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{ L, sol::in_place_type<bool>, b });
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values.push_back({ L, sol::in_place, "awoo" });
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return values;
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});
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lua.script("print('calling multi_vars')");
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lua.script("print(multi_vars(2, false))");
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lua.script("t, u, v = multi_vars(42, true)");
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int t = lua["t"];
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bool u = lua["u"];
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std::string v = lua["v"];
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SOL_ASSERT(t == 42);
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SOL_ASSERT(u);
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SOL_ASSERT(v == "awoo");
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return 0;
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}
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