template <class InputIterator, class UnaryFunction> UnaryFunction for_each(InputIterator first, InputIterator last, UnaryFunction f);DescriptionFor_each applies the function object f to each element in the range [first, last); f's return value, if any, is ignored. Applications are performed in forward order, i.e. from first to last. For_each returns the function object after it has been applied to each element. [1] Definition Defined in the standard header algorithm, and in the nonstandard backward-compatibility header algo.h. Requirements on types
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;
}
Notes
[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.
See also The function object overview, count, copy STL Main PageRetroSearch is an open source project built by @garambo | Open a GitHub Issue
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