Is there any reason not to make a member function virtual?

Question

Is there any real reason not to make a member function virtual in C++? Of course, there\'s always the performance argument, but that doesn\'t seem to stick

Answer 1

The Non-Virtual Interface idiom makes use of non-virtual methods. For more information please refer to Herb Sutter "Virtuality" article.

http://www.gotw.ca/publications/mill18.htm

And comments on the NVI idiom:

http://www.parashift.com/c++-faq-lite/strange-inheritance.html#faq-23.3 http://accu.org/index.php/journals/269 [See sub-section]