Add C++11 container utility functions.

src/core/container_func.hpp

@@ -0,0 +1,35 @@
+/* $Id$ */
+
+/*
+ * This file is part of OpenTTD.
+ * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
+ * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/** @file container_func.hpp Functions related to use of containers. */
+
+template <typename C, typename UP> unsigned int container_unordered_remove_if (C &container, UP predicate) {
+	unsigned int removecount = 0;
+	for (auto it = container.begin(); it != container.end();) {
+		if (predicate(*it)) {
+			removecount++;
+			if (std::next(it) != container.end()) {
+				*it = std::move(container.back());
+				container.pop_back();
+			} else {
+				container.pop_back();
+				break;
+			}
+		} else {
+			++it;
+		}
+	}
+	return removecount;
+}
+
+template <typename C, typename V> unsigned int container_unordered_remove(C &container, const V &value) {
+	return container_unordered_remove_if (container, [&](const typename C::value_type &v) {
+		return v == value;
+	});
+}