forked from qt-creator/qt-creator
0b3d03121f
Use more C++ api and constexpr. With C++ 17 we can use even more. Change-Id: I33934cd7e087c311bf98501442df848bdb108279 Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>
131 lines
3.9 KiB
C++
131 lines
3.9 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2016 The Qt Company Ltd.
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** Contact: https://www.qt.io/licensing/
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**
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** This file is part of Qt Creator.
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**
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 3 as published by the Free Software
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** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
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** included in the packaging of this file. Please review the following
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** information to ensure the GNU General Public License requirements will
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** be met: https://www.gnu.org/licenses/gpl-3.0.html.
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**
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****************************************************************************/
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#pragma once
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#include <cstddef>
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#include <iterator>
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namespace Utils {
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namespace Internal {
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template<class Category,
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class Type,
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typename DistanceType = ptrdiff_t,
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typename Pointer = Type *,
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typename Reference = Type &>
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struct SmallStringIterator
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{
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using iterator_category = Category;
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using value_type = Type;
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using difference_type = DistanceType;
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using pointer = Pointer;
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using reference = Reference;
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constexpr SmallStringIterator() noexcept = default;
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constexpr SmallStringIterator(Pointer ptr) noexcept
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: pointer_(ptr)
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{}
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constexpr SmallStringIterator operator++() noexcept { return ++pointer_; }
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constexpr SmallStringIterator operator++(int) noexcept { return pointer_++; }
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constexpr SmallStringIterator operator--() noexcept { return --pointer_; }
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constexpr SmallStringIterator operator--(int) noexcept { return pointer_--; }
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constexpr SmallStringIterator operator+(DistanceType difference) const noexcept
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{
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return pointer_ + difference;
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}
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constexpr SmallStringIterator operator-(DistanceType difference) const noexcept
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{
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return pointer_ - difference;
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}
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constexpr SmallStringIterator operator+(std::size_t difference) const noexcept
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{
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return pointer_ + difference;
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}
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constexpr SmallStringIterator operator-(std::size_t difference) const noexcept
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{
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return pointer_ - difference;
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}
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constexpr DistanceType operator-(SmallStringIterator other) const noexcept
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{
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return pointer_ - other.data();
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}
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constexpr SmallStringIterator operator+=(DistanceType difference) noexcept
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{
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return pointer_ += difference;
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}
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constexpr SmallStringIterator operator-=(DistanceType difference) noexcept
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{
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return pointer_ -= difference;
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}
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constexpr Reference operator*() noexcept { return *pointer_; }
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const Reference operator*() const noexcept { return *pointer_; }
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constexpr Pointer operator->() noexcept { return pointer_; }
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constexpr const Pointer operator->() const noexcept { return pointer_; }
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constexpr bool operator==(SmallStringIterator other) const noexcept
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{
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return pointer_ == other.pointer_;
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}
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constexpr bool operator!=(SmallStringIterator other) const noexcept
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{
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return pointer_ != other.pointer_;
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}
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constexpr bool operator<(SmallStringIterator other) const noexcept
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{
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return pointer_ < other.pointer_;
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}
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constexpr Pointer data() noexcept { return pointer_; }
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constexpr const Pointer data() const noexcept { return pointer_; }
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private:
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Pointer pointer_ = nullptr;
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};
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} // namespace Internal
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} // namespace Utils
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