1 files changed, 97 insertions, 0 deletions
diff --git a/deps/sol2/examples/interop/tolua/source/tolua.cpp b/deps/sol2/examples/interop/tolua/source/tolua.cpp
new file mode 100644
index 0000000..d413e27
--- /dev/null
+++ b/deps/sol2/examples/interop/tolua/source/tolua.cpp
@@ -0,0 +1,97 @@
+#define SOL_ALL_SAFETIES_ON 1
+#define SOL_ENABLE_INTEROP 1 // MUST be defined to use interop features
+#include <sol/sol.hpp>
+
+#include "Player.h"
+#include <tolua++.h>
+// pick or replace the include
+// with whatever generated file you've created
+#include "tolua_Player.h"
+
+#include <iostream>
+#include <assert.hpp>
+
+// tolua code lifted from some blog, if the link dies
+// I don't know where else you're gonna find the reference,
+// http://usefulgamedev.weebly.com/tolua-example.html
+
+
+/* NOTE: there is no sol_lua_interop_get here,
+ because tolua types are -- thankfully -- memory-compatible
+ in most cases with sol.
+ Please check other examples like kaguya or LuaBribe for an example
+ of how to also write the getter for your type*/
+template <typename T, typename Handler>
+inline bool sol_lua_interop_check(sol::types<T>, lua_State* L, int relindex, sol::type index_type, Handler&& handler, sol::stack::record& tracking) {
+	tracking.use(1);
+	// just marking unused parameters for no compiler warnings
+	(void)index_type;
+	(void)handler;
+	int index = lua_absindex(L, relindex);
+	std::string name = sol::detail::short_demangle<T>();
+	tolua_Error tolua_err{};
+	int r = tolua_isusertype(L, index, name.c_str(), 0, &tolua_err);
+	if (r == 0) {
+		// tolua seems to leave garbage on the stack
+		// when the check fails
+		// thanks, tolua
+		lua_pop(L, 2);
+		return false;
+	}
+	return true;
+}
+
+void register_sol_stuff(lua_State* L) {
+	// grab raw state and put into state_view
+	// state_view is cheap to construct
+	sol::state_view lua(L);
+	// bind and set up your things: everything is entirely self-contained
+	lua["f"] = sol::overload(
+		[](Player& from_tolua) {
+			std::cout << "calling 1-argument version with tolua-created Player { health:" << from_tolua.getHealth() << " }" << std::endl;
+			c_assert(from_tolua.getHealth() == 4);
+		},
+		[](Player& from_tolua, int second_arg) {
+			std::cout << "calling 2-argument version with tolua-created Player { health: " << from_tolua.getHealth() << " } and integer argument of " << second_arg << std::endl;
+			c_assert(from_tolua.getHealth() == 4);
+			c_assert(second_arg == 5);
+		});
+}
+
+void check_with_sol(lua_State* L) {
+	sol::state_view lua(L);
+	Player& obj = lua["obj"];
+	(void)obj;
+	c_assert(obj.getHealth() == 4);
+}
+
+int main(int, char* []) {
+
+	std::cout << "=== interop example (tolua) ===" << std::endl;
+	std::cout << "(code lifted from a sol2 user's use case: https://github.com/ThePhD/sol2/issues/511#issuecomment-331729884)" << std::endl;
+
+	lua_State* L = luaL_newstate();
+
+	luaL_openlibs(L);	// initalize all lua standard library functions
+	tolua_open(L);		  // initalize tolua
+	tolua_Player_open(L); // make Player class accessible from LUA
+
+
+	register_sol_stuff(L);
+
+	const auto code = R"(
+obj = Player:new()
+obj:setHealth(4)
+
+f(obj) -- call 1 argument version
+f(obj, 5) -- call 2 argument version
+)";
+
+	if (luaL_dostring(L, code)) {
+		lua_error(L); // crash on error
+	}
+
+	check_with_sol(L);
+
+	return 0;
+}
+\ No newline at end of file