88 lines
2.7 KiB
C++
88 lines
2.7 KiB
C++
/*
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This file is part of Telegram Desktop,
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the official desktop version of Telegram messaging app, see https://telegram.org
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Telegram Desktop is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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It is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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In addition, as a special exception, the copyright holders give permission
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to link the code of portions of this program with the OpenSSL library.
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Full license: https://github.com/telegramdesktop/tdesktop/blob/master/LICENSE
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Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
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*/
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#pragma once
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namespace base {
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// This version of remove_if allows predicate to push_back() items.
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// The added items won't be tested for predicate but just left in the container.
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template <typename Container, typename Predicate>
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void push_back_safe_remove_if(
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Container &&container,
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Predicate &&predicate) {
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auto first = size_t(0);
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auto count = container.size();
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auto moveFrom = first;
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for (; moveFrom != count; ++moveFrom) {
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if (predicate(container[moveFrom])) {
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break;
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}
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}
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if (moveFrom != count) {
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auto moveTo = moveFrom;
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for (++moveFrom; moveFrom != count; ++moveFrom) {
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if (!predicate(container[moveFrom])) {
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container[moveTo++] = std::move(container[moveFrom]);
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}
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}
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// Move items that we've added while checking the initial items.
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count = container.size();
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for (; moveFrom != count; ++moveFrom) {
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container[moveTo++] = std::move(container[moveFrom]);
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}
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container.erase(container.begin() + moveTo, container.end());
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}
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}
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template <typename Range, typename Method>
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decltype(auto) for_each(Range &&range, Method &&method) {
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return std::for_each(
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std::begin(std::forward<Range>(range)),
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std::end(std::forward<Range>(range)),
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std::forward<Method>(method));
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}
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template <typename Method>
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decltype(auto) for_each_apply(Method &&method) {
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return [&method](auto &&range) {
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return for_each(std::forward<decltype(range)>(range), std::forward<Method>(method));
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};
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}
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template <typename Range, typename Value>
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decltype(auto) find(Range &&range, Value &&value) {
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return std::find(
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std::begin(std::forward<Range>(range)),
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std::end(std::forward<Range>(range)),
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std::forward<Value>(value));
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}
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template <typename Range, typename Predicate>
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decltype(auto) find_if(Range &&range, Predicate &&predicate) {
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return std::find_if(
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std::begin(std::forward<Range>(range)),
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std::end(std::forward<Range>(range)),
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std::forward<Predicate>(predicate));
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}
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} // namespace base
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