1 #include "mystring.h"

     2 

     3 mystring mystring::subst(char from, char to) const

     4 {

     5   const unsigned length = rep->length;

     6   char buf[length+1];

     7   const char* in = rep->buf + length;

     8   bool changed = true;

     9   for(char* out = buf+length; out >= buf; in--, out--)

    10     if(*in == from)

    11       *out = to, changed = true;

    12     else

    13       *out = *in;

    14   if(!changed)

    15     return *this;

    16   else

    17     return mystring(buf, length);

    18 }