clang - loses information, C++ (clang)

clang - loses information

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Compilation time: 1 sec, absolute service time: 1,04 sec

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Error(s):

source_file.cpp:6:12: error: cast from pointer to smaller type 'unsigned int' loses information
  return !(reinterpret_cast<unsigned int>(in) % alignof(T));
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 error generated.

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