Range.h

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// Copyright 2024 libsese
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
 
 
#pragma once
 
#include <sese/Config.h>
 
namespace sese {
 
template<class TYPE>
class Range {
public:
    explicit Range(TYPE count) {
        this->beginNumber = 1;
        this->endNumber = count;
    }
 
    Range(TYPE begin, TYPE end) {
        if (begin > end) {
            std::swap(begin, end);
        }
 
        this->beginNumber = begin;
        this->endNumber = end;
    }
 
    class Iterator {
    public:
        using difference_type = int64_t;
        using value_type = TYPE;
        using pointer = const TYPE *;
        using reference = const TYPE &;
        using iterator_category = std::forward_iterator_tag;
 
        explicit Iterator(TYPE cur_number) : curNumber(cur_number) {}
 
        Iterator &operator++() {
            this->curNumber += 1;
            return *this;
        }
 
        Iterator operator++(int) { // NOLINT
            Iterator iterator = *this;
            iterator.curNumber += 1;
            return iterator;
        }
 
        bool operator==(Iterator iterator) const {
            return this->curNumber == iterator.curNumber;
        }
 
        bool operator!=(Iterator iterator) const {
            return this->curNumber != iterator.curNumber;
        }
 
        TYPE operator*() const {
            return this->curNumber;
        }
 
    private:
        TYPE curNumber = 0;
    };
 
    class ReverseIterator {
    public:
        using difference_type = int64_t;
        using value_type = TYPE;
        using pointer = const TYPE *;
        using reference = const TYPE &;
        using iterator_category = std::forward_iterator_tag;
 
        explicit ReverseIterator(TYPE cur_number) : curNumber(cur_number) {}
 
        ReverseIterator &operator++() {
            this->curNumber -= 1;
            return *this;
        }
 
        ReverseIterator operator++(int) { // NOLINT
            Iterator iterator = *this;
            iterator.curNumber -= 1;
            return iterator;
        }
 
        bool operator==(ReverseIterator iterator) const {
            return this->curNumber == iterator.curNumber;
        }
 
        bool operator!=(ReverseIterator iterator) const {
            return this->curNumber != iterator.curNumber;
        }
 
        TYPE operator*() const {
            return this->curNumber;
        }
 
    private:
        TYPE curNumber = 0;
    };
 
    Iterator begin() {
        return Iterator(beginNumber);
    }
 
    Iterator end() {
        return Iterator(endNumber + 1);
    }
 
    ReverseIterator rbegin() {
        return ReverseIterator(endNumber);
    }
 
    ReverseIterator rend() {
        return ReverseIterator(beginNumber - 1);
    }
 
    bool exist(const TYPE &num) const {
        return this->beginNumber <= num && this->endNumber >= num;
    }
 
private:
    TYPE beginNumber = 0;
    TYPE endNumber = 0;
};
} // namespace sese