Add base/algorithm for range-based algorithms.

Telegram/SourceFiles/base/algorithm.h

@@ -0,0 +1,40 @@
+/*
+This file is part of Telegram Desktop,
+the official desktop version of Telegram messaging app, see https://telegram.org
+
+Telegram Desktop 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, either version 3 of the License, or
+(at your option) any later version.
+
+It 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.
+
+In addition, as a special exception, the copyright holders give permission
+to link the code of portions of this program with the OpenSSL library.
+
+Full license: https://github.com/telegramdesktop/tdesktop/blob/master/LICENSE
+Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
+*/
+#pragma once
+
+namespace base {
+
+template <typename Range, typename Method>
+decltype(auto) for_each(Range &&range, Method &&method) {
+	return std::for_each(
+		std::begin(std::forward<Range>(range)),
+		std::end(std::forward<Range>(range)),
+		std::forward<Method>(method));
+}
+
+template <typename Method>
+decltype(auto) for_each_apply(Method &&method) {
+	return [&method](auto &&range) {
+		return for_each(std::forward<decltype(range)>(range), std::forward<Method>(method));
+	};
+}
+
+} // namespace base

Telegram/SourceFiles/stdafx.h

@@ -64,6 +64,9 @@ Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
 #include <memory>
 #include <gsl/gsl>
 
+#include "base/variant.h"
+#include "base/algorithm.h"
+
 #include "core/basic_types.h"
 #include "logs.h"
 #include "core/utils.h"

Telegram/gyp/telegram_sources.txt

@@ -1,3 +1,4 @@
+<(src_loc)/base/algorithm.h
 <(src_loc)/base/build_config.h
 <(src_loc)/base/flat_map.h
 <(src_loc)/base/flat_set.h