122 lines
3.6 KiB
C++
122 lines
3.6 KiB
C++
#ifndef IVL_svector_H
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#define IVL_svector_H
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/*
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* Copyright (c) 1999-2017 Stephen Williams (steve@icarus.com)
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*
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* This source code is free software; you can redistribute it
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* and/or modify it in source code form under the terms of the GNU
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* General Public License as published by the Free Software
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* Foundation; either version 2 of the License, or (at your option)
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* any later version. In order to redistribute the software in
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* binary form, you will need a Picture Elements Binary Software
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* License.
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*
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* This program 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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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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# include "config.h"
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# include <string>
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# include <vector>
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# include <cassert>
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/*
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* This is a way simplified vector class that cannot grow or shrink,
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* and is really only able to handle values. It is intended to be
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* lighter weight than the STL list class.
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*/
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template <class TYPE> class svector {
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public:
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explicit svector() : nitems_(0), items_(0) { }
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explicit svector(unsigned size) : nitems_(size), items_(new TYPE[size])
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{ for (unsigned idx = 0 ; idx < size ; idx += 1)
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items_[idx] = TYPE(0);
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}
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svector(const svector<TYPE>&that)
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: nitems_(that.nitems_), items_(new TYPE[nitems_])
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{ for (unsigned idx = 0 ; idx < that.nitems_ ; idx += 1)
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items_[idx] = that[idx];
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}
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svector(const svector<TYPE>&l, const svector<TYPE>&r)
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: nitems_(l.nitems_ + r.nitems_), items_(new TYPE[nitems_])
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{ for (unsigned idx = 0 ; idx < l.nitems_ ; idx += 1)
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items_[idx] = l[idx];
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for (unsigned idx = 0 ; idx < r.nitems_ ; idx += 1)
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items_[l.nitems_+idx] = r[idx];
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}
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svector(const svector<TYPE>&l, TYPE&r)
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: nitems_(l.nitems_ + 1), items_(new TYPE[nitems_])
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{ for (unsigned idx = 0 ; idx < l.nitems_ ; idx += 1)
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items_[idx] = l[idx];
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items_[nitems_-1] = r;
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}
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~svector() { delete[]items_; }
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svector<TYPE>& operator= (const svector<TYPE>&that)
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{ if (&that == this) return *this;
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delete[]items_;
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nitems_ = that.nitems_;
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items_ = new TYPE[nitems_];
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for (unsigned idx = 0 ; idx < nitems_ ; idx += 1) {
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items_[idx] = that.items_[idx];
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}
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return *this;
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}
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unsigned count() const { return nitems_; }
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TYPE&operator[] (unsigned idx)
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{ assert(idx < nitems_);
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return items_[idx];
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}
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TYPE operator[] (unsigned idx) const
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{ assert(idx < nitems_);
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return items_[idx];
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}
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private:
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unsigned nitems_;
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TYPE* items_;
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};
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/*
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* Override the implementation of the above template for the string
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* type parameter. The initialization to nil works different here.
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*/
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template <> inline svector<std::string>::svector(unsigned size)
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: nitems_(size), items_(new std::string[size])
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{
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}
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/*
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* This is a convenience function that converts an svector to a
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* vector. This is to ease the transition from svector to vector so
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* that the svector class can be gradually removed.
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*/
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template <class T> inline std::vector<T> vector_from_svector(const svector<T>&that)
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{
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std::vector<T> res (that.count());
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for (unsigned idx = 0 ; idx < that.count() ; idx += 1)
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res[idx] = that[idx];
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return res;
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}
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#endif /* IVL_svector_H */
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