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Fixed bug in copySampleElements.

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This commit is contained in:
Mathew Sutcliffe
2016-03-19 16:06:05 +00:00
parent 46d71ed1a2
commit 9857e7f045
1 changed files with 4 additions and 3 deletions
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7
src/blackmisc/algorithm.h
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@@ -63,12 +63,13 @@ namespace BlackMisc
template <typename ForwardIt, typename OutputIt, typename Generator>
void copySampleElements(ForwardIt in, ForwardIt end, OutputIt out, const int n, Generator &&rng)
{
for (const auto size = std::distance(in, end); in != end && n > 0; )
const auto size = static_cast<int>(std::distance(in, end));
for (int i = 0; i < std::min(n, size); ++i)
{
const auto index = std::uniform_int_distribution<>(0, size / n - 1)(rng);
const auto index = std::uniform_int_distribution<>(0, std::max(size / n, 1) - 1)(rng);
std::advance(in, index);
*out++ = *in;
std::advance(in, size / n - index);
std::advance(in, std::max(size / n, 1) - index);
}
}