50 lines
849 B
C++
50 lines
849 B
C++
#ifndef PERSISTENT_DATA_RANGE_H
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#define PERSISTENT_DATA_RANGE_H
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#include <boost/optional.hpp>
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#include <ostream>
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//----------------------------------------------------------------
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namespace base {
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template <typename T>
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class range {
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public:
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typedef boost::optional<T> maybe;
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range(maybe begin = maybe(), maybe end = maybe())
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: begin_(begin),
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end_(end) {
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}
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bool operator ==(range<T> const &r) const {
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return (begin_ == r.begin_ && end_ == r.end_);
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}
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maybe begin_;
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maybe end_;
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};
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template <typename T>
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std::ostream &
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operator <<(std::ostream &out, range<T> const &r) {
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if (r.begin_)
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out << "[" << *r.begin_;
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else
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out << "[-";
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out << ", ";
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if (r.end_)
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out << *r.end_ << "]";
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else
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out << "-]";
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return out;
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}
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}
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//----------------------------------------------------------------
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#endif
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