< cpp‎ | memory
Defined in header <memory>
template< class InputIt, class ForwardIt >
ForwardIt uninitialized_copy( InputIt first, InputIt last, ForwardIt d_first );

Copies elements from the range [first, last) to an uninitialized memory area beginning at d_first. If an exception is thrown during the initialization, the function has no effects.


[edit] Parameters

first, last - the range of the elements to copy
d_first - the beginning of the destination range
Type requirements
InputIt must meet the requirements of InputIterator.
ForwardIt must meet the requirements of ForwardIterator.

[edit] Return value

Iterator to the element past the last element copied.

[edit] Complexity

Linear in the distance between first and last

[edit] Possible implementation

template<class InputIt, class ForwardIt>
ForwardIt uninitialized_copy(InputIt first, InputIt last, ForwardIt d_first)
    typedef typename std::iterator_traits<ForwardIt>::value_type Value;
    ForwardIt current = d_first;
    try {
        for (; first != last; ++first, ++current) {
            ::new (static_cast<void*>(&*current)) Value(*first);
        return current;
    } catch (...) {
        for (; d_first != current; ++d_first) {

[edit] Example

#include <algorithm>
#include <iostream>
#include <memory>
#include <string>
#include <tuple>
#include <vector>
int main()
    std::vector<std::string> v = {"This", "is", "an", "example"};
    std::string* p;
    std::size_t sz;
    std::tie(p, sz)  = std::get_temporary_buffer<std::string>(v.size());
    sz = std::min(sz, v.size());
    std::uninitialized_copy(v.begin(), v.begin() + sz, p);
    for (std::string* i = p; i != p+sz; ++i) {
        std::cout << *i << ' ';


This is an example

[edit] See also

copies a number of objects to an uninitialized area of memory
(function template)