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C++ Iterator Library - iterator_traits
Description
It traits class defining properties of iterators.
Declaration
Following is the declaration for std::iterator_traits.
C++11
template <class Iterator> class iterator_traits; template <class T> class iterator_traits<T*>; template <class T> class iterator_traits<const T*>;
Parameters
T − It indicates about type of element.
Return value
none
Exceptions
If x somehow throws while applying the unary operator& to it, this function never throws exceptions.
Time complexity
constant for random-access iterators.
Example
The following example shows the usage of std::iterator_traits.
#include <iostream> #include <iterator> #include <typeinfo> int main() { typedef std::iterator_traits<int*> traits; if (typeid(traits::iterator_category)==typeid(std::random_access_iterator_tag)) std::cout << "int* is a random-access iterator"; return 0; }
Let us compile and run the above program, this will produce the following result −
int* is a random-access iterator
iterator.htm
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