What are some C++ related idioms, misconceptions, and gotchas that you've learnt from experience?

Question

What are some C++ related idioms, misconceptions, and gotchas that you\'ve learnt from experience?

An example:

class A
{
  public: 
  char s[1024];
  cha         


        

Answer 1

I've liked this since the time i've discovered it in some code:

assert(condition || !"Something has gone wrong!");

or if you don't have a condition at hand, you can just do

assert(!"Something has gone wrong!");

The following is attributed to @Josh (see comments). It uses the comma operator instead:

assert(("Something has gone wrong!", condition));