os_count_if

Counts items in a container that satisfy a predicate.

A helper algorithm for count_if() . Returns the number of elements in container c that cause predicate pred to return true .

Library

Helper<ToolKit>

Declaration


  #include <ospace/helper/helpalgo.h>

template< class Container, class Predicate >
int os_count_if( const Container& c, Predicate pred )

Example <ospace/helper/examples/ocntif0.cpp>


    #include <iostream>
#include <vector>
#include <ospace/helper.h>

int
odd( int a_ )
  {
  return a_ % 2;
  }

void
main()
  {
  vector< int > numbers( 100 );
  for ( int i = 0; i < 100; ++i )
    numbers[ i ] = i % 3;

  int elements = os_count_if( numbers, odd );

  cout << "Found " << elements << " odd elements.\n";
  }

Found 33 odd elements.

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