mirror of
https://github.com/triqs/dft_tools
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60 lines
2.1 KiB
C++
60 lines
2.1 KiB
C++
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/*******************************************************************************
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*
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* TRIQS: a Toolbox for Research in Interacting Quantum Systems
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*
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* Copyright (C) 2011 by O. Parcollet
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*
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* TRIQS is free software: you can redistribute it and/or modify it under the
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* terms of the GNU General Public License as published by the Free Software
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* Foundation, either version 3 of the License, or (at your option) any later
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* version.
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*
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* TRIQS is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License along with
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* TRIQS. If not, see <http://www.gnu.org/licenses/>.
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*
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******************************************************************************/
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#ifndef TRIQS_ARRAYS_RANGE_H
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#define TRIQS_ARRAYS_RANGE_H
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#include <ostream>
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namespace triqs { namespace arrays {
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/**
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*/
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class range {
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std::ptrdiff_t first_, last_, step_;
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public:
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range():first_(0),last_(-1),step_(1) {} // i.e. all
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range(const range& r):first_(r.first_), last_(r.last_), step_(r.step_) {}
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range(std::ptrdiff_t first__, std::ptrdiff_t last__, std::ptrdiff_t step__=1):first_(first__), last_(last__), step_(step__) {}
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std::ptrdiff_t first() const { return first_;}
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std::ptrdiff_t last () const { return last_;}
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std::ptrdiff_t step() const { return step_;}
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size_t size() const { std::ptrdiff_t r = (last_ - first_ + 1)/step_; if (r<0) TRIQS_RUNTIME_ERROR <<" range with negative size"; return size_t(r);}
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range operator+(std::ptrdiff_t shift) const { return range(first_ + shift, last_ + shift, step_); }
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friend inline std::ostream& operator<<(std::ostream& os, const range& range) {
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os << "range(" << range.first() << "," << range.last() << "," << range.step() << ")";
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return os;
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}
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};
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/**
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*/
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class ellipsis : public range {
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public :
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ellipsis( std::ptrdiff_t first__, std::ptrdiff_t last__, std::ptrdiff_t step__=1): range(first__, last__, step__) {}
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ellipsis() : range() {}
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};
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}}//namespace triqs::arrays
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#endif
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