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Showing content from https://timsong-cpp.github.io/cppwp/n4659/uninitialized.fill below:

[uninitialized.fill]

23 General utilities library [utilities] 23.10 Memory [memory] 23.10.10 Specialized algorithms [specialized.algorithms] 23.10.10.6 uninitialized_­fill [uninitialized.fill]

template <class ForwardIterator, class T> void uninitialized_fill(ForwardIterator first, ForwardIterator last, const T& x);

Effects: As if by:

for (; first != last; ++first)
  ::new (static_cast<void*>(addressof(*first)))
    typename iterator_traits<ForwardIterator>::value_type(x);

template <class ForwardIterator, class Size, class T> ForwardIterator uninitialized_fill_n(ForwardIterator first, Size n, const T& x);

Effects: As if by:

for (; n--; ++first)
  ::new (static_cast<void*>(addressof(*first)))
    typename iterator_traits<ForwardIterator>::value_type(x);
return first;

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