Provide std::generate_n with predicate : generate_n « STL Algorithms Modifying sequence operations « C++ Tutorial

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

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

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

char nextLetter();

int main()
{
   std::vector< char > chars( 10 );
   std::ostream_iterator< char > output( cout, " " );

   // generate values for first five elements of chars with nextLetter
   std::generate_n( chars.begin(), 5, nextLetter );

   cout << "\n\nVector chars after generating letters A-J:\n";
   std::copy( chars.begin(), chars.end(), output );

   cout << endl;
   return 0;
}

// generator function returns next letter (starts with A)
char nextLetter() {
   static char letter = 'A';
   return letter++;
}

Vector chars after generating letters A-J:
A B C D E