std::copy

template <class InputIterator, class OutputIterator> OutputIterator copy (InputIterator first, InputIterator last, OutputIterator result);

Copy range of elements

Copies the elements in the range [first,last) into the range beginning at result.

The function returns an iterator to the end of the destination range (which points to the element following the last element copied).

The ranges shall not overlap in such a way that result points to an element in the range [first,last). For such cases, see copy_backward .

The behavior of this function template is equivalent to:

template<class InputIterator, class OutputIterator>
 OutputIterator copy (InputIterator first, InputIterator last, OutputIterator result)
{
 while (first!=last) {
 *result = *first;
 ++result; ++first;
 }
 return result;
}

Parameters

first, last: Input iterators to the initial and final positions in a sequence to be copied. The range used is [first,last), which contains all the elements between first and last, including the element pointed by first but not the element pointed by last.
result: Output iterator to the initial position in the destination sequence.
This shall not point to any element in the range [first,last).

Return value

An iterator to the end of the destination range where elements have been copied.

Example

// copy algorithm example
#include <iostream> // std::cout
#include <algorithm> // std::copy
#include <vector> // std::vector
int main () {
 int myints[]={10,20,30,40,50,60,70};
 std::vector<int> myvector (7);
 std::copy ( myints, myints+7, myvector.begin() );
 std::cout << "myvector contains:";
 for (std::vector<int>::iterator it = myvector.begin(); it!=myvector.end(); ++it)
 std::cout << ' ' << *it;
 std::cout << '\n';
 return 0;
}

Output:

myvector contains: 10 20 30 40 50 60 70

Complexity

Linear in the distance between first and last: Performs an assignment operation for each element in the range.

Data races

The objects in the range [first,last) are accessed (each object is accessed exactly once).
The objects in the range between result and the returned value are modified (each object is modified exactly once).

Exceptions

Throws if either an element assignment or an operation on iterators throws.
Note that invalid arguments cause undefined behavior.