87 lines
3.1 KiB
C++
87 lines
3.1 KiB
C++
/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef TNT_UTILS_RANGE_H
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#define TNT_UTILS_RANGE_H
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#include <algorithm>
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#include <assert.h>
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#include <stddef.h>
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#include <utils/compiler.h>
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namespace utils {
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template<typename T>
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struct Range {
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using value_type = T;
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T first = 0;
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T last = 0;
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size_t size() const noexcept { return last - first; }
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bool empty() const noexcept { return !size(); }
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class const_iterator {
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friend struct Range;
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T value = {};
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public:
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const_iterator() noexcept = default;
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explicit const_iterator(T value) noexcept : value(value) {}
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using value_type = T;
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using pointer = value_type*;
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using difference_type = ptrdiff_t;
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using iterator_category = std::random_access_iterator_tag;
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const value_type operator*() const { return value; }
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const value_type operator[](size_t n) const { return value + n; }
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const_iterator& operator++() { ++value; return *this; }
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const_iterator& operator--() { --value; return *this; }
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const const_iterator operator++(int) { const_iterator t(value); value++; return t; }
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const const_iterator operator--(int) { const_iterator t(value); value--; return t; }
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const_iterator operator+(size_t rhs) const { return { value + rhs }; }
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const_iterator operator+(size_t rhs) { return { value + rhs }; }
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const_iterator operator-(size_t rhs) const { return { value - rhs }; }
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difference_type operator-(const_iterator const& rhs) const { return value - rhs.value; }
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bool operator==(const_iterator const& rhs) const { return (value == rhs.value); }
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bool operator!=(const_iterator const& rhs) const { return (value != rhs.value); }
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bool operator>=(const_iterator const& rhs) const { return (value >= rhs.value); }
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bool operator> (const_iterator const& rhs) const { return (value > rhs.value); }
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bool operator<=(const_iterator const& rhs) const { return (value <= rhs.value); }
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bool operator< (const_iterator const& rhs) const { return (value < rhs.value); }
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};
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const_iterator begin() noexcept { return const_iterator{ first }; }
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const_iterator end() noexcept { return const_iterator{ last }; }
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const_iterator begin() const noexcept { return const_iterator{ first }; }
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const_iterator end() const noexcept { return const_iterator{ last }; }
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const_iterator front() const noexcept { return const_iterator{ first }; }
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const_iterator back() const noexcept { return const_iterator{ last - 1 }; }
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};
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} // namespace utils
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#endif // TNT_UTILS_RANGE_H
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