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/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
file Copyright.txt or https://cmake.org/licensing for details. */
#ifndef cmRange_h
#define cmRange_h
#include "cmConfigure.h" // IWYU pragma: keep
#include <algorithm>
#include <iterator>
template <typename Iter>
class cmRange
{
public:
using const_iterator = Iter;
using value_type = typename std::iterator_traits<Iter>::value_type;
using difference_type = typename std::iterator_traits<Iter>::difference_type;
cmRange(Iter b, Iter e)
: Begin(std::move(b))
, End(std::move(e))
{
}
Iter begin() const { return this->Begin; }
Iter end() const { return this->End; }
bool empty() const { return this->Begin == this->End; }
difference_type size() const
{
return std::distance(this->Begin, this->End);
}
cmRange& advance(difference_type amount) &
{
std::advance(this->Begin, amount);
return *this;
}
cmRange advance(difference_type amount) &&
{
std::advance(this->Begin, amount);
return std::move(*this);
}
cmRange& retreat(difference_type amount) &
{
std::advance(this->End, -amount);
return *this;
}
cmRange retreat(difference_type amount) &&
{
std::advance(this->End, -amount);
return std::move(*this);
}
private:
Iter Begin;
Iter End;
};
template <typename Iter1, typename Iter2>
auto cmMakeRange(Iter1 begin, Iter2 end) -> cmRange<Iter1>
{
return { begin, end };
}
template <typename Range>
auto cmMakeRange(Range const& range) -> cmRange<decltype(range.begin())>
{
return { range.begin(), range.end() };
}
template <typename Range>
auto cmReverseRange(Range const& range) -> cmRange<decltype(range.rbegin())>
{
return { range.rbegin(), range.rend() };
}
#endif
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