Renamed lib to deps so github will ignore it for language stats

1 files changed, 0 insertions, 151 deletions

diff --git a/lib/sol2/examples/source/metatable_customization.cpp b/lib/sol2/examples/source/metatable_customization.cpp
deleted file mode 100644
index c259598..0000000
--- a/lib/sol2/examples/source/metatable_customization.cpp
+++ /dev/null
@@ -1,151 +0,0 @@
-#define SOL_ALL_SAFETIES_ON 1

-#include <sol/sol.hpp>

-

-#include <iostream>

-

-struct thing {

-	int member_variable = 5;

-

-	double member_function() const {

-		return member_variable / 2.0;

-	}

-};

-

-#define TEMPLATE_AUTO(x) decltype(x), x

-

-// cheap storage: in reality, you'd need to find a

-// better way of handling this.

-// or not! It's up to you.

-static std::unordered_map<sol::string_view, sol::object> thing_function_associations;

-static std::unordered_map<sol::string_view, sol::object> thing_variable_associations;

-

-void register_thing_type(sol::state& lua) {

-	thing_variable_associations.emplace_hint(thing_variable_associations.cend(),

-		"member_variable", sol::object(lua.lua_state(), sol::in_place, &sol::c_call<TEMPLATE_AUTO(&thing::member_variable)>)

-	);

-	thing_function_associations.emplace_hint(thing_function_associations.cend(),

-		"member_function", sol::object(lua.lua_state(), sol::in_place, &sol::c_call<TEMPLATE_AUTO(&thing::member_function)>)

-	);

-

-	struct call_handler {

-		static int lookup_function(lua_State* L) {

-			sol::stack_object source(L, 1);

-			sol::stack_object key(L, 2);

-			if (!source.is<thing>()) {

-				return luaL_error(L, "given an incorrect object for this call");

-			}

-			sol::optional<sol::string_view> maybe_svkey = key.as<sol::optional<sol::string_view>>();

-			if (maybe_svkey) {

-				{

-					// functions are different from variables

-					// functions, when obtain with the syntax

-					// obj.f, obj.f(), and obj:f()

-					// must return the function itself

-					// so we just push it realy into our target

-					auto it = thing_function_associations.find(*maybe_svkey);

-					if (it != thing_function_associations.cend()) {

-						return it->second.push(L);

-					}

-				}

-				{

-					// variables are different than funtions

-					// when someone does `obj.a`, they expect

-					// this __index call (this lookup function) to

-					// return to them the value itself they're seeing

-					// so we call out lua_CFunction that we serialized earlier

-					auto it = thing_variable_associations.find(*maybe_svkey);

-					if (it != thing_variable_associations.cend()) {

-						// note that calls generated by sol3 

-						// for member variables expect the stack ordering to be

-						// 2(, 3, ..., n) -- value(s)

-						// 1 -- source

-						// so we destroy the key on the stack

-						sol::stack::remove(L, 2, 1);

-						lua_CFunction cf = it->second.as<lua_CFunction>();

-						return cf(L);

-					}

-				}

-			}

-			return sol::stack::push(L, sol::lua_nil);

-		}

-

-		static int insertion_function(lua_State* L) {

-			sol::stack_object source(L, 1);

-			sol::stack_object key(L, 2);

-			sol::stack_object value(L, 3);

-			if (!source.is<thing>()) {

-				return luaL_error(L, "given an incorrect object for this call");

-			}

-			// write to member variables, etc. etc...

-			sol::optional<sol::string_view> maybe_svkey = key.as<sol::optional<sol::string_view>>();

-			if (maybe_svkey) {

-				{

-					// variables are different than funtions

-					// when someone does `obj.a`, they expect

-					// this __index call (this lookup function) to

-					// return to them the value itself they're seeing

-					// so we call out lua_CFunction that we serialized earlier

-					auto it = thing_variable_associations.find(*maybe_svkey);

-					if (it != thing_variable_associations.cend()) {

-						// note that calls generated by sol3 

-						// for member variables expect the stack ordering to be

-						// 2(, 3, ..., n) -- value(s)

-						// 1 -- source

-						// so we remove the key value

-						sol::stack::remove(L, 2, 1);

-						lua_CFunction cf = it->second.as<lua_CFunction>();

-						return cf(L);

-					}

-					else {

-						// write to member variable, maybe override function

-						// if your class allows for it?

-						(void)value;

-					}

-				}

-				// exercise for reader:

-				// how do you override functions on the metatable with

-				// proper syntax, but error when the type is

-				// an "instance" object?

-			}

-			return 0;

-		}

-	};

-

-	lua.new_usertype<thing>("thing");

-	sol::table metatable = lua["thing"];

-

-	metatable[sol::meta_method::index] = &call_handler::lookup_function;

-	metatable[sol::meta_method::new_index] = &call_handler::insertion_function;

-}

-

-void unregister_thing_type(sol::state&) {

-	thing_function_associations.clear();

-	thing_variable_associations.clear();

-}

-

-int main() {

-

-	std::cout << "=== metatable with custom-built (static) handling ===" << std::endl;

-

-

-	sol::state lua;

-	lua.open_libraries(sol::lib::base);

-

-	// register custom type + storage

-	register_thing_type(lua);

-

-	lua.script(R"(t = thing.new() 

-		print(t.member_variable)

-		print(t:member_function())

-		t.member_variable = 24

-		print(t.member_variable)

-		print(t:member_function())

-	)");

-

-	// clear storage

-	unregister_thing_type(lua);

-

-	std::cout << std::endl;

-

-	return 0;

-}