Another example, constness derp fix

examples/usertype_var.cpp

@@ -0,0 +1,41 @@
+#define SOL_CHECK_ARGUMENTS
+#include <sol.hpp>
+#include <iostream>
+
+struct test {
+	static int number;
+};
+int test::number = 25;
+
+
+int main() {
+	sol::state lua;
+	lua.open_libraries();
+	lua.new_usertype<test>("test",
+		"direct", sol::var(2),
+		"number", sol::var(test::number),
+		"ref_number", sol::var(std::ref(test::number))
+	);
+
+	int direct_value = lua["test"]["direct"];
+	assert(direct_value == 2);
+	// direct_value == 2
+
+	int number = lua["test"]["number"];
+	assert(number == 25);
+	int ref_number = lua["test"]["ref_number"];
+	assert(ref_number == 25);
+	
+	test::number = 542;
+
+	assert(lua["test"]["number"] == 25);
+	// number is its own memory: was passed by value
+	// So does not change
+
+	assert(lua["test"]["ref_number"] == 25);
+	// ref_number is just test::number 
+	// passed through std::ref
+	// so, it holds a reference
+
+	return 0;
+}

single/sol/sol.hpp

@@ -20,8 +20,8 @@
 // CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 // This file was generated with a script.
-// Generated 2016-10-05 04:59:38.196043 UTC
-// This header was generated with sol v2.14.9 (revision 009d6b0)
+// Generated 2016-10-06 00:39:21.588762 UTC
+// This header was generated with sol v2.14.9 (revision d51db7d)
 // https://github.com/ThePhD/sol2
 
 #ifndef SOL_SINGLE_INCLUDE_HPP
@@ -9423,7 +9423,7 @@ namespace sol {
 		}
 
 		template<std::size_t... I, typename T>
-		void tuple_set(std::index_sequence<I...>, T&& value) const {
+		void tuple_set(std::index_sequence<I...>, T&& value) {
 			tbl.traverse_set(std::get<I>(key)..., std::forward<T>(value));
 		}
 

sol/proxy.hpp

@@ -40,7 +40,7 @@ namespace sol {
 		}
 
 		template<std::size_t... I, typename T>
-		void tuple_set(std::index_sequence<I...>, T&& value) const {
+		void tuple_set(std::index_sequence<I...>, T&& value) {
 			tbl.traverse_set(std::get<I>(key)..., std::forward<T>(value));
 		}
 

tests.cpp

@@ -663,3 +663,18 @@ TEST_CASE("proxy/proper-pushing", "allow proxies to reference other proxies and
 	bool b = lua["b"];
 	REQUIRE(b);
 }
+
+TEST_CASE("compilation/const-regression", "make sure constness in tables is respected all the way down") {
+	struct State {
+	public:
+		State() {
+			this->state_.registry()["state"] = this;
+		}
+
+		sol::state state_;
+	};
+
+	State state;
+	State* s = state.state_.registry()["state"];
+	REQUIRE(s == &state);
+}