2 ms·

Yeah, why would you care about the size of a temporary arithmetic expression?

• ElectroPrime 14y ago
  Well... sizeof of an expression is mostly useful for not repeating yourself in cases when you need the size of a type you already have some way of referencing, as in a = malloc(sizeof(*a)); It's also useful for various hacks (stuff like compile-time assert macros), since it doesn't evaluate the expression, only its type.
  • marshray 14y ago
    Sure, I can think of plenty of ways it could arise via metaprogramming. I don't know if I would want such a warning enabled in my own template-heavy C++ code. But it perhaps it could be useful for those following the NetBSD style. :-)
  • pizza_ 14y ago
    sizeof is an operator, no need for the inner parens.