4 ms·

Technically, the code is wrong only if f() is not pure.

• eps 15y ago
  Yes, I know, but there is no way to enforce it. This a classic "noob" mistake with macros - using a macro argument more than once.
  • dkersten 15y ago
    That's why in C++ people seem to generally recommend inline functions instead. Not only do the arguments only get evaluated once, but the whole thing is type safe too. Of course, people still misuse macros.
    • Drbble 15y ago
      Macros, by definition, are always misused, complete the languages point of view. They exist to let the programmer get the job done when the language falls short.
      • dkersten 15y ago
        Well, I would define misuse as using them when the language doesn't fall short, like for the max example.
  • CGamesPlay 15y ago
    I feel pretty safe assuming a pure function in a blog post about the advantages of immutability, really.