Category: algorithms | Component type: function |
template <class InputIterator, class UnaryFunction> UnaryFunction for_each(InputIterator first, InputIterator last, UnaryFunction f);
template<class T> struct print : public unary_function<T, void> { print(ostream& out) : os(out), count(0) {} void operator() (T x) { os << x << ' '; ++count; } ostream& os; int count; }; int main() { int A[] = {1, 4, 2, 8, 5, 7}; const int N = sizeof(A) / sizeof(int); print<int> P = for_each(A, A + N, print<int>(cout)); cout << endl << P.count << " objects printed." << endl; }
[1] This return value is sometimes useful, since a function object may have local state. It might, for example, count the number of times that it is called, or it might have a status flag to indicate whether or not a call succeeded.
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