Search element in a sequence for a condition with algorithm find_if - C++ STL Algorithm

C++ examples for STL Algorithm:find_if

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Description

Search element in a sequence for a condition with algorithm find_if

Demo Code

#include <iostream> 
#include <algorithm> // algorithm definitions 
#include <vector> // vector class-template definition 
#include <iterator> 
using namespace std;

bool greater10(int value); // predicate function prototype 

int main()/*  w  w  w.j  a va 2s  .  c  o  m*/
{
  const int SIZE = 10;
  int a[SIZE] = { 10, 2, 17, 5, 16, 8, 13, 11, 20, 7 };
  vector< int > v(a, a + SIZE); // copy of a 
  ostream_iterator< int > output(cout, " ");

  cout << "Vector v contains: ";
  copy(v.begin(), v.end(), output); // display output vector 

                    // locate first occurrence of value greater than 10 in v 
  vector< int >::iterator location = find_if(v.begin(), v.end(), greater10);

  if (location != v.end()) // found value greater than 10 
    cout << "\n\nThe first value greater than 10 is " << *location << "\nfound at location " << (location - v.begin());
  else // value greater than 10 not found 
    cout << "\n\nNo values greater than 10 were found";

}

// determine whether argument is greater than 10 
bool greater10(int value)
{
  return value > 10;
} // end function greater10

Result


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