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authorNorbert Preining <norbert@preining.info>2019-09-02 13:46:59 +0900
committerNorbert Preining <norbert@preining.info>2019-09-02 13:46:59 +0900
commite0c6872cf40896c7be36b11dcc744620f10adf1d (patch)
tree60335e10d2f4354b0674ec22d7b53f0f8abee672 /dviware/dvisvgm/src/VectorIterator.hpp
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+/*************************************************************************
+** VectorIterator.hpp **
+** **
+** This file is part of dvisvgm -- a fast DVI to SVG converter **
+** Copyright (C) 2005-2019 Martin Gieseking <martin.gieseking@uos.de> **
+** **
+** This program 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. **
+** **
+** This program 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. **
+** **
+** You should have received a copy of the GNU General Public License **
+** along with this program; if not, see <http://www.gnu.org/licenses/>. **
+*************************************************************************/
+
+#ifndef VECTORITERATOR_HPP
+#define VECTORITERATOR_HPP
+
+#include <vector>
+#include "MessageException.hpp"
+
+
+struct IteratorException : public MessageException {
+ explicit IteratorException (const std::string &msg) : MessageException(msg) {}
+};
+
+
+template <typename T>
+class VectorIterator {
+ public:
+ explicit VectorIterator (std::vector<T> &vec) : _vector(vec), _pos(0) {}
+
+ VectorIterator operator ++ () {
+ _pos++;
+ return *this;
+ }
+
+ VectorIterator operator ++ (int) {
+ VectorIterator it = *this;
+ _pos++;
+ return it;
+ }
+
+ VectorIterator operator -- () {
+ _pos--;
+ return *this;
+ }
+
+ VectorIterator operator -- (int) {
+ VectorIterator it = *this;
+ _pos--;
+ return it;
+ }
+
+ VectorIterator operator += (int n) {
+ _pos += n;
+ return *this;
+ }
+
+ VectorIterator operator -= (int n) {
+ _pos -= n;
+ return *this;
+ }
+
+ VectorIterator operator + (int n) {
+ return VectorIterator(_vector, _pos+n);
+ }
+
+ VectorIterator operator - (int n) {
+ return VectorIterator(_vector, _pos-n);
+ }
+
+ T& operator * () {
+ if (valid())
+ return _vector[_pos];
+ throw IteratorException("invalid access");
+ }
+
+ T* operator -> () {
+ if (valid())
+ return &_vector[_pos];
+ throw IteratorException("invalid access");
+ }
+
+ bool operator == (const VectorIterator &it) const {return _pos == it._pos;}
+ bool operator != (const VectorIterator &it) const {return _pos != it._pos;}
+ bool operator <= (const VectorIterator &it) const {return _pos <= it._pos;}
+ bool operator >= (const VectorIterator &it) const {return _pos >= it._pos;}
+ bool operator < (const VectorIterator &it) const {return _pos < it._pos;}
+ bool operator > (const VectorIterator &it) const {return _pos > it._pos;}
+ bool valid () const {return _pos >= 0 && _pos < _vector.size();}
+ void invalidate () {_pos = _vector.size();}
+ void reset () {_pos = 0;}
+
+ protected:
+ VectorIterator (std::vector<T> &vec, size_t pos) : _vector(vec), _pos(pos) {}
+
+ private:
+ std::vector<T> &_vector;
+ size_t _pos;
+};
+
+#endif