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[uninitialized.construct.value]
# 26 Algorithms library [[algorithms]](./#algorithms)
## 26.11 Specialized <memory> algorithms [[specialized.algorithms]](specialized.algorithms#uninitialized.construct.value)
### 26.11.4 uninitialized_value_construct [uninitialized.construct.value]
[🔗](#lib:uninitialized_value_construct)
`template<class NoThrowForwardIterator>
constexpr void uninitialized_value_construct(NoThrowForwardIterator first,
NoThrowForwardIterator last);
`
[1](#1)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/algorithms.tex#L13799)
*Effects*: Equivalent to:for (; first != last; ++first)::new (*voidify*(*first))typename iterator_traits<NoThrowForwardIterator>::value_type();
[🔗](#lib:uninitialized_value_construct_)
`namespace ranges {
template<[nothrow-forward-iterator](special.mem.concepts#concept:nothrow-forward-iterator "26.11.2Special memory concepts[special.mem.concepts]") I, [nothrow-sentinel-for](special.mem.concepts#concept:nothrow-sentinel-for "26.11.2Special memory concepts[special.mem.concepts]")<I> S>
requires [default_initializable](concept.default.init#concept:default_initializable "18.4.12Concept default_­initializable[concept.default.init]")<iter_value_t<I>>
constexpr I uninitialized_value_construct(I first, S last);
template<[nothrow-forward-range](special.mem.concepts#concept:nothrow-forward-range "26.11.2Special memory concepts[special.mem.concepts]") R>
requires [default_initializable](concept.default.init#concept:default_initializable "18.4.12Concept default_­initializable[concept.default.init]")<range_value_t<R>>
constexpr borrowed_iterator_t<R> uninitialized_value_construct(R&& r);
}
`
[2](#2)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/algorithms.tex#L13822)
*Effects*: Equivalent to:for (; first != last; ++first)::new (*voidify*(*first)) remove_reference_t<iter_reference_t<I>>();return first;
[🔗](#lib:uninitialized_value_construct_n)
`template<class NoThrowForwardIterator, class Size>
constexpr NoThrowForwardIterator
uninitialized_value_construct_n(NoThrowForwardIterator first, Size n);
`
[3](#3)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/algorithms.tex#L13840)
*Effects*: Equivalent to:for (; n > 0; (void)++first, --n)::new (*voidify*(*first))typename iterator_traits<NoThrowForwardIterator>::value_type();return first;
[🔗](#lib:uninitialized_value_construct_n_)
`namespace ranges {
template<[nothrow-forward-iterator](special.mem.concepts#concept:nothrow-forward-iterator "26.11.2Special memory concepts[special.mem.concepts]") I>
requires [default_initializable](concept.default.init#concept:default_initializable "18.4.12Concept default_­initializable[concept.default.init]")<iter_value_t<I>>
constexpr I uninitialized_value_construct_n(I first, iter_difference_t<I> n);
}
`
[4](#4)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/algorithms.tex#L13861)
*Effects*: Equivalent to:return uninitialized_value_construct(counted_iterator(first, n),
default_sentinel).base();