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std::uninitialized_copy

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< cpp‎ | memory
Revision as of 15:30, 2 November 2012 by P12bot (Talk | contribs)

 
 
 
 
Defined in header <memory>
template< class InputIt, class Size, class ForwardIt >
ForwardIt uninitialized_copy_n( InputIt first, Size count, ForwardIt d_first);
(since C++11)

Copies count elements from a range beginning at first to an uninitialized memory area beginning at d_first. The elements in the uninitialized area are constructed using copy constructor.

If an exception is thrown during the initialization, the function has no effects.

Contents

Parameters

first - the beginning of 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.

Return value

Iterator to the element past the last element copied.

Complexity

Linear in count.

Possible implementation

template<class InputIt, class Size, class ForwardIt>
ForwardIt uninitialized_copy_n(InputIt first, Size count, ForwardIt d_first)
{
    typedef typename std::iterator_traits<ForwardIt>::value_type Value;
    for (; count > 0; ++first, ++d_first, --count) {
        ::new (static_cast<void*>(&*d_first)) Value(*first);
    }
    return d_first;
}

Example

See also

Template:cpp/memory/dcl list uninitialized copy