Question

In a loop running over the entire string how do i peek at the next value of iterator?

for (string::iterator it = inp.begin(); it!= inp.end(); ++it)
{
  // Just peek at the next value of it, without actually incrementing the iterator
}

This is quite simple in C,

for (i = 0; i < strlen(str); ++i) {
     if (str[i] == str[i+1]) {
         // Processing
     }
}

Any efficient way to do above in c++?

Note: Im not using Boost.

Answer 1

if ( not imp.empty() )
{
    for (string::iterator it = inp.begin(); it!= inp.end(); ++it)
         if (it + 1 != inp.end() and *it == *(it + 1)) {
             // Processing
         }
    }
}

or

if ( not imp.empty() )
{
    for (string::iterator it = inp.begin(); it!= inp.end() - 1; ++it)
        if ( *it == *(it+1) ) {
            // Processing
        }
    }
}