template <class InIter, class UnPred>    ptrdiff_t count_if(InIter start, InIter end, UnPred pfn);

The count_if( ) algorithm returns the number of elements in the sequence beginning at start and ending at end for which the unary predicate pfn returns true.

C(s)C++ Programmer's Reference
C Programming on the IBM PC (C Programmers Reference Guide Series)
ISBN: 0673462897
EAN: 2147483647
Year: 2002
Pages: 539

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