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

Nothing I actually came across while programming, but a friend wanted an explanation on why the code worked. It took me a while to figure it out. Maybe it is obvious to you guys, but I am not an experienced programmer.

#include 
using namespace std;

int& strangeFunction(int& x){return x;}


int main(){
        int a=0;
        strangeFunction(a) = 5;               //<------- I found this very confusing
        cout << a <