C sizeof a passed array [duplicate]

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There is no magic solution. C is not a reflective language. Objects don’t automatically know what they are.

But you have many choices:

  1. Obviously, add a parameter
  2. Wrap the call in a macro and automatically add a parameter
  3. Use a more complex object. Define a structure which contains the dynamic array and also the size of the array. Then, pass the address of the structure.

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