std::replace_if with predicate : replace if « STL Algorithms Modifying sequence operations « C++ Tutorial

1. C++ Tutorial
2. STL Algorithms Modifying sequence operations
3. replace if

#include <iostream>
using std::cout;
using std::endl;

#include <algorithm>
#include <vector>
#include <iterator>

bool greater9( int );

int main()
{
   int a[ 10 ] = { 10, 2, 10, 4, 16, 6, 14, 8, 12, 10 };
   std::ostream_iterator< int > output( cout, " " );

   std::vector< int > v3( a, a + 10 ); // copy of a
   cout << "Vector v3 before replacing values greater than 9:\n   ";
   std::copy( v3.begin(), v3.end(), output );

   // replace values greater than 9 in v3 with 100
   std::replace_if( v3.begin(), v3.end(), greater9, 100 );
   cout << "\nVector v3 after replacing all values greater"
      << "\nthan 9 with 100s:\n   ";
   std::copy( v3.begin(), v3.end(), output );

   cout << endl;
   return 0;
}

bool greater9( int x )
{
   return x > 9;
}

Vector v3 before replacing values greater than 9:
   10 2 10 4 16 6 14 8 12 10
Vector v3 after replacing all values greater
than 9 with 100s:
   100 2 100 4 100 6 100 8 100 100