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[algorithm] Add nth_element

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This commit is contained in:
MikeGitb 2016-12-06 00:10:07 +01:00
parent 2221c56fc5
commit 931d54184d
1 changed files with 17 additions and 1 deletions
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18
gsl/gsl_algorithm
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@ -45,7 +45,8 @@ void copy(span<SrcElementType, SrcExtent> src, span<DestElementType, DestExtent>
{ {
static_assert(std::is_assignable<decltype(*dest.data()), decltype(*src.data())>::value, static_assert(std::is_assignable<decltype(*dest.data()), decltype(*src.data())>::value,
"Elements of source span can not be assigned to elements of destination span"); "Elements of source span can not be assigned to elements of destination span");
static_assert(SrcExtent == dynamic_extent || DestExtent == dynamic_extent || (SrcExtent <= DestExtent), static_assert(SrcExtent == dynamic_extent || DestExtent == dynamic_extent ||
(SrcExtent <= DestExtent),
"Source range is longer than target range"); "Source range is longer than target range");
Expects(dest.size() >= src.size()); Expects(dest.size() >= src.size());
@ -152,6 +153,21 @@ void stable_sort(span<SrcElementType, SrcExtent> rng, Compare comp)
std::stable_sort(rng.data(), rng.data() + rng.size(), comp); std::stable_sort(rng.data(), rng.data() + rng.size(), comp);
} }
// nth_element
template <class SrcElementType, std::ptrdiff_t SrcExtent>
void nth_element(span<SrcElementType, SrcExtent> rng,
typename span<SrcElementType, SrcExtent>::index_type nth)
{
std::nth_element(rng.data(), &rng[nth], rng.data() + rng.size());
}
template <class SrcElementType, std::ptrdiff_t SrcExtent, class Compare>
void nth_element(span<SrcElementType, SrcExtent> rng,
typename span<SrcElementType, SrcExtent>::index_type nth, Compare comp)
{
std::nth_element(rng.data(), &rng[nth], rng.data() + rng.size(), comp);
}
} // namespace gsl } // namespace gsl
#ifdef _MSC_VER #ifdef _MSC_VER