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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 cmAlgorithms_h
#define cmAlgorithms_h
#include "cmConfigure.h" // IWYU pragma: keep
#include <algorithm>
#include <functional>
#include <iterator>
#include <memory>
#include <unordered_set>
#include <utility>
#include <vector>
#include <cmext/algorithm>
#include "cmRange.h"
template <typename FwdIt>
FwdIt cmRotate(FwdIt first, FwdIt middle, FwdIt last)
{
const typename std::iterator_traits<FwdIt>::difference_type dist =
std::distance(middle, last);
std::rotate(first, middle, last);
std::advance(first, dist);
return first;
}
namespace ContainerAlgorithms {
template <typename FwdIt>
FwdIt RemoveN(FwdIt i1, FwdIt i2, size_t n)
{
FwdIt m = i1;
std::advance(m, n);
return cmRotate(i1, m, i2);
}
template <typename Range>
struct BinarySearcher
{
using argument_type = typename Range::value_type;
BinarySearcher(Range const& r)
: m_range(r)
{
}
bool operator()(argument_type const& item) const
{
return std::binary_search(m_range.begin(), m_range.end(), item);
}
private:
Range const& m_range;
};
}
class cmListFileBacktrace;
using cmBacktraceRange =
cmRange<std::vector<cmListFileBacktrace>::const_iterator>;
template <typename Range>
typename Range::const_iterator cmRemoveN(Range& r, size_t n)
{
return ContainerAlgorithms::RemoveN(r.begin(), r.end(), n);
}
template <typename Range, typename InputRange>
typename Range::const_iterator cmRemoveIndices(Range& r, InputRange const& rem)
{
typename InputRange::const_iterator remIt = rem.begin();
typename InputRange::const_iterator remEnd = rem.end();
const auto rangeEnd = r.end();
if (remIt == remEnd) {
return rangeEnd;
}
auto writer = r.begin();
std::advance(writer, *remIt);
auto pivot = writer;
typename InputRange::value_type prevRem = *remIt;
++remIt;
size_t count = 1;
for (; writer != rangeEnd && remIt != remEnd; ++count, ++remIt) {
std::advance(pivot, *remIt - prevRem);
prevRem = *remIt;
writer = ContainerAlgorithms::RemoveN(writer, pivot, count);
}
return ContainerAlgorithms::RemoveN(writer, rangeEnd, count);
}
template <typename Range, typename MatchRange>
typename Range::const_iterator cmRemoveMatching(Range& r, MatchRange const& m)
{
return std::remove_if(r.begin(), r.end(),
ContainerAlgorithms::BinarySearcher<MatchRange>(m));
}
template <typename ForwardIterator>
ForwardIterator cmRemoveDuplicates(ForwardIterator first, ForwardIterator last)
{
using Value = typename std::iterator_traits<ForwardIterator>::value_type;
struct Hash
{
std::size_t operator()(ForwardIterator it) const
{
return std::hash<Value>{}(*it);
}
};
struct Equal
{
bool operator()(ForwardIterator it1, ForwardIterator it2) const
{
return *it1 == *it2;
}
};
std::unordered_set<ForwardIterator, Hash, Equal> uniq;
ForwardIterator result = first;
while (first != last) {
if (!cm::contains(uniq, first)) {
if (result != first) {
*result = std::move(*first);
}
uniq.insert(result);
++result;
}
++first;
}
return result;
}
template <typename Range>
typename Range::const_iterator cmRemoveDuplicates(Range& r)
{
return cmRemoveDuplicates(r.begin(), r.end());
}
template <typename Range, typename T>
typename Range::const_iterator cmFindNot(Range const& r, T const& t)
{
return std::find_if(r.begin(), r.end(), [&t](T const& i) { return i != t; });
}
#endif
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