public member function
<iterator>
std::reverse_iterator::operator-reverse_iterator operator- (difference_type n) const;
Subtraction operator
Returns a reverse iterator pointing to the element located n positions before the element the iterator currently points to.Internally, the function applies the binary operator+ on the base iterator and returns a reverse iterator constructed with the resulting iterator value.
Note that this function requires the base iterator to be a random-access iterator.
This operator is also overloaded as a non-member function to return the difference of subtracting iterators: see operator-).
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// reverse_iterator::operator- example
#include <iostream> // std::cout
#include <iterator> // std::reverse_iterator
#include <vector> // std::vector
int main () {
std::vector<int> myvector;
for (int i=0; i<10; i++) myvector.push_back(i); // myvector: 0 1 2 3 4 5 6 7 8 9
typedef std::vector<int>::iterator iter_type;
std::reverse_iterator<iter_type> rev_iterator;
rev_iterator = myvector.rend() - 3;
std::cout << "myvector.rend()-3 points to: " << *rev_iterator << '\n';
return 0;
}myvector.rend()-3 points to: 2
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