1 #include "mystring.h"
2 
subst(char from,char to) const3 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 }
19