I recently learned that empty class have size 1 instead of zero.Why it has no byte alignment, in which it's size should be 4 in 32bit environment? What's the address of the next object?
Why c++ empty class have no byte alignment?
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Because C++ simply does not guarantee 4-byte alignment, or word-alignment, of variables. If this is important to you, you can specify an alignment requirement using
alignas
:and now, the address of a
my_empty_struct
variable would be a multiple of 4 - and so will its size, apparently.Alternatively, you could pad your struct with a dummy field for alignment, yourself. The
alignas
is a bit like padding with an inaccessible field.