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

[uninitialized.construct.default]

23 General utilities library [utilities] 23.10 Memory [memory] 23.10.10 Specialized algorithms [specialized.algorithms] 23.10.10.2 uninitialized_­default_­construct [uninitialized.construct.default]

template <class ForwardIterator> void uninitialized_default_construct(ForwardIterator first, ForwardIterator last);

Effects: Equivalent to:

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

template <class ForwardIterator, class Size> ForwardIterator uninitialized_default_construct_n(ForwardIterator first, Size n);

Effects: Equivalent to:

for (; n>0; (void)++first, --n)
  ::new (static_cast<void*>(addressof(*first)))
    typename iterator_traits<ForwardIterator>::value_type;
return first;

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