copy

1.5.3.6 copy


o copy(i,i,o)	Copy a range of items to a destination and return an iterator pointing to the end of the copied range.

b2 copy_backward(b1,b1last, b2)	Copy a range of items backwards to a destination and return an iterator pointing to the end of the copied range.

Example:

for (int i=1; i<=5; i++)
myvector.push_back(i*10);
// myvector: 10 20 30 40 50

copy(myvector.begin(), myvector.end(), myvector.begin()+3)
//error, when source and targe is overlap,
//you have to use backward copy

copy_backward(myvector.begin(), myvector.end(), myvector.begin()+4)
// pay attention, copy_backward, *(--last) =
//if you want copy to position 3, you need to input position 4
//or you can input vector.end() as target,
//but for copy, you can’t input vector.end()

Copy. Inside Copy, It use assignment operator =. o should be insert iterator or target should be use reserve() to allocate space for assignment operator =.

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