Working on reimplementing the player characters

I've also added EraseIf() to the manager classes.

server/client_manager.cpp

@@ -38,12 +38,23 @@ int ClientManager::HandleDisconnection(int i) {
 	return -1;
 }
 
-void ClientManager::ForEach(Lambda fn) {
+void ClientManager::ForEach(std::function<void(Iterator)> fn) {
 	for(Iterator it = clientMap.begin(); it != clientMap.end(); it++) {
 		fn(it);
 	}
 }
 
+void ClientManager::EraseIf(std::function<bool(Iterator)> fn) {
+	for(Iterator it = clientMap.begin(); it != clientMap.end(); /* empty */) {
+		if(fn(it)) {
+			it = clientMap.erase(it);
+		}
+		else {
+			++it;
+		}
+	}
+}
+
 ClientEntry* ClientManager::GetClient(int i) {
 	for (auto& it : clientMap) {
 		if (it.first == i) {