There seems to be this strange misconception that Squid-3 is a "rewrite" of Squid in C++. I am not sure where this particular little tidbit gets copy/pasted from but just for the record:
Squid-3 is the continuation of Squid-2.5, made to compile using the GNU C++ compiler. It is not a rewrite.
If Squid-3 -were- a rewrite, and the resultant code -was- as much of a crappy-performing, bastardised C/C++ hybrid, then I'd have suggested the C++ coders in question need to relearn C++. Luckily for them, the codebase is a hybrid of C and C++ because it did just start as a C codebase with bits and pieces part-migrated to C++.