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

Here is another one i caught some day:

char int2hex(int x) {
     return "-0123456789abcdef"[(x >= 0 && x < 16) ? (x + 1) : 0];
}

it's just indexing the char array instead of doing a switch. If it's outside the range, it returns '-'.