[uninitialized.copy]

# 26 Algorithms library [[algorithms]](./#algorithms)

## 26.11 Specialized <memory> algorithms [[specialized.algorithms]](specialized.algorithms#uninitialized.copy)

### 26.11.5 uninitialized_copy [uninitialized.copy]

[ð](#lib:uninitialized_copy)

`template<class InputIterator, class NoThrowForwardIterator>
  constexpr NoThrowForwardIterator uninitialized_copy(InputIterator first, InputIterator last,
                                                      NoThrowForwardIterator result);
`

[1](#1)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/algorithms.tex#L13880)

*Preconditions*: result+[0, (last - first)) does not overlap with [first, last)[.](#1.sentence-1)

[2](#2)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/algorithms.tex#L13884)

*Effects*: Equivalent to:for (; first != last; ++result, (void)++first)::new (*voidify*(*result))typename iterator_traits<NoThrowForwardIterator>::value_type(*first);

[3](#3)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/algorithms.tex#L13893)

*Returns*: result[.](#3.sentence-1)

[ð](#lib:uninitialized_copy_)

`namespace ranges {
  template<[input_iterator](iterator.concept.input#concept:input_iterator "24.3.4.9 Concept input_­iterator [iterator.concept.input]") I, [sentinel_for](iterator.concept.sentinel#concept:sentinel_for "24.3.4.7 Concept sentinel_­for [iterator.concept.sentinel]")<I> S1,
           [nothrow-forward-iterator](special.mem.concepts#concept:nothrow-forward-iterator "26.11.2 Special memory concepts [special.mem.concepts]") O, [nothrow-sentinel-for](special.mem.concepts#concept:nothrow-sentinel-for "26.11.2 Special memory concepts [special.mem.concepts]")<O> S2>
    requires [constructible_from](concept.constructible#concept:constructible_from "18.4.11 Concept constructible_­from [concept.constructible]")<iter_value_t<O>, iter_reference_t<I>>
    constexpr uninitialized_copy_result<I, O>
      uninitialized_copy(I ifirst, S1 ilast, O ofirst, S2 olast);
  template<[input_range](range.refinements#concept:input_range "25.4.6 Other range refinements [range.refinements]") IR, [nothrow-forward-range](special.mem.concepts#concept:nothrow-forward-range "26.11.2 Special memory concepts [special.mem.concepts]") OR>
    requires [constructible_from](concept.constructible#concept:constructible_from "18.4.11 Concept constructible_­from [concept.constructible]")<range_value_t<OR>, range_reference_t<IR>>
    constexpr uninitialized_copy_result<borrowed_iterator_t<IR>, borrowed_iterator_t<OR>>
      uninitialized_copy(IR&& in_range, OR&& out_range);
}
`

[4](#4)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/algorithms.tex#L13914)

*Preconditions*: [ofirst, olast) does not overlap with [ifirst, ilast)[.](#4.sentence-1)

[5](#5)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/algorithms.tex#L13918)

*Effects*: Equivalent to:for (; ifirst != ilast && ofirst != olast; ++ofirst, (void)++ifirst)::new (*voidify*(*ofirst)) remove_reference_t<iter_reference_t<O>>(*ifirst);return {std::move(ifirst), ofirst};

[ð](#lib:uninitialized_copy_n)

`template<class InputIterator, class Size, class NoThrowForwardIterator>
  constexpr NoThrowForwardIterator uninitialized_copy_n(InputIterator first, Size n,
                                                        NoThrowForwardIterator result);
`

[6](#6)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/algorithms.tex#L13936)

*Preconditions*: result+[0, n) does not overlap with first+[0, n)[.](#6.sentence-1)

[7](#7)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/algorithms.tex#L13940)

*Effects*: Equivalent to:for (; n > 0; ++result, (void)++first, --n)::new (*voidify*(*result))typename iterator_traits<NoThrowForwardIterator>::value_type(*first);

[8](#8)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/algorithms.tex#L13949)

*Returns*: result[.](#8.sentence-1)

[ð](#lib:uninitialized_copy_n_)

`namespace ranges {
  template<[input_iterator](iterator.concept.input#concept:input_iterator "24.3.4.9 Concept input_­iterator [iterator.concept.input]") I, [nothrow-forward-iterator](special.mem.concepts#concept:nothrow-forward-iterator "26.11.2 Special memory concepts [special.mem.concepts]") O, [nothrow-sentinel-for](special.mem.concepts#concept:nothrow-sentinel-for "26.11.2 Special memory concepts [special.mem.concepts]")<O> S>
    requires [constructible_from](concept.constructible#concept:constructible_from "18.4.11 Concept constructible_­from [concept.constructible]")<iter_value_t<O>, iter_reference_t<I>>
    constexpr uninitialized_copy_n_result<I, O>
      uninitialized_copy_n(I ifirst, iter_difference_t<I> n, O ofirst, S olast);
}
`

[9](#9)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/algorithms.tex#L13965)

*Preconditions*: [ofirst, olast) does not overlap withifirst+[0, n)[.](#9.sentence-1)

[10](#10)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/algorithms.tex#L13970)

*Effects*: Equivalent to:auto t = uninitialized_copy(counted_iterator(std::move(ifirst), n),
 default_sentinel, ofirst, olast);return {std::move(t.in).base(), t.out};
