1 files changed, 71 insertions, 0 deletions
diff --git a/deps/sol2/examples/source/tutorials/variables_demo.cpp b/deps/sol2/examples/source/tutorials/variables_demo.cpp
new file mode 100644
index 0000000..d5228d1
--- /dev/null
+++ b/deps/sol2/examples/source/tutorials/variables_demo.cpp
@@ -0,0 +1,71 @@
+#define SOL_ALL_SAFETIES_ON 1
+#include <sol/sol.hpp>
+
+#include <tuple>
+#include <assert.hpp>
+#include <utility> // for std::pair
+
+int main() {
+
+	sol::state lua;
+	/*
+	lua.script_file("variables.lua");
+	*/
+	lua.script(R"(
+config = {
+	fullscreen = false,
+	resolution = { x = 1024, y = 768 }
+}
+	)");
+	// the type "sol::state" behaves 
+	// exactly like a table!
+	bool isfullscreen = lua["config"]["fullscreen"]; // can get nested variables
+	sol::table config = lua["config"];
+	c_assert(!isfullscreen);
+
+	// can also get it using the "get" member function
+	// auto replaces the unqualified type name
+	auto resolution = config.get<sol::table>("resolution");
+
+	// table and state can have multiple things pulled out of it too
+	std::tuple<int, int> xyresolutiontuple = resolution.get<int, int>("x", "y");
+	c_assert(std::get<0>(xyresolutiontuple) == 1024);
+	c_assert(std::get<1>(xyresolutiontuple) == 768);
+
+	// test variable
+	auto bark = lua["config"]["bark"];
+	if (bark.valid()) {
+		// branch not taken: config and/or bark are not variables
+	}
+	else {
+		// Branch taken: config and bark are existing variables
+	}
+
+	// can also use optional
+	sol::optional<int> not_an_integer = lua["config"]["fullscreen"];
+	if (not_an_integer) {
+		// Branch not taken: value is not an integer
+	}
+
+	sol::optional<bool> is_a_boolean = lua["config"]["fullscreen"];
+	if (is_a_boolean) {
+		// Branch taken: the value is a boolean
+	}
+
+	sol::optional<double> does_not_exist = lua["not_a_variable"];
+	if (does_not_exist) {
+		// Branch not taken: that variable is not present
+	}
+
+	// this will result in a value of '24'
+	// (it tries to get a number, and fullscreen is
+	// not a number
+	int is_defaulted = lua["config"]["fullscreen"].get_or(24);
+	c_assert(is_defaulted == 24);
+
+	// This will result in the value of the config, which is 'false'
+	bool is_not_defaulted = lua["config"]["fullscreen"];
+	c_assert(!is_not_defaulted);
+
+	return 0;
+}