80 lines
1.9 KiB
C++
80 lines
1.9 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 <tuple>
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#include <utility> // for std::pair
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int main() {
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sol::state lua;
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/*
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lua.script_file("variables.lua");
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*/
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lua.script(R"(
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config = {
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fullscreen = false,
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resolution = { x = 1024, y = 768 }
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}
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)");
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// the type "sol::state" behaves
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// exactly like a table!
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bool isfullscreen
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= lua["config"]
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["fullscreen"]; // can get nested variables
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sol::table config = lua["config"];
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SOL_ASSERT(!isfullscreen);
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// can also get it using the "get" member function
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// auto replaces the unqualified type name
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auto resolution = config.get<sol::table>("resolution");
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// table and state can have multiple things pulled out of it
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// too
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std::tuple<int, int> xyresolutiontuple
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= resolution.get<int, int>("x", "y");
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SOL_ASSERT(std::get<0>(xyresolutiontuple) == 1024);
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SOL_ASSERT(std::get<1>(xyresolutiontuple) == 768);
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// test variable
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auto bark = lua["config"]["bark"];
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if (bark.valid()) {
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// branch not taken: config and/or bark are not
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// variables
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}
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else {
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// Branch taken: config and bark are existing variables
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}
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// can also use optional
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sol::optional<int> not_an_integer
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= lua["config"]["fullscreen"];
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if (not_an_integer) {
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// Branch not taken: value is not an integer
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}
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sol::optional<bool> is_a_boolean
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= lua["config"]["fullscreen"];
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if (is_a_boolean) {
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// Branch taken: the value is a boolean
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}
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sol::optional<double> does_not_exist
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= lua["not_a_variable"];
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if (does_not_exist) {
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// Branch not taken: that variable is not present
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}
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// this will result in a value of '24'
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// (it tries to get a number, and fullscreen is
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// not a number
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int is_defaulted = lua["config"]["fullscreen"].get_or(24);
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SOL_ASSERT(is_defaulted == 24);
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// This will result in the value of the config, which is
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// 'false'
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bool is_not_defaulted = lua["config"]["fullscreen"];
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SOL_ASSERT(!is_not_defaulted);
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return 0;
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}
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