What is more efficient, i++ or ++i? [duplicate]

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i++ :

  • create a temporary copy of i
  • increment i
  • return the temporary copy

++i :

  • increment i
  • return i

With optimizations on, it is quite possible that the resulting assembly is identical, however ++i is more efficient.

edit : keep in mind that in C++, i may be whatever object that support the prefix and postfix ++ operator. For complex objects, the temporary copy cost is non negligible.

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