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padding

Unused bytes the compiler adds so fields line up.

Padding is unused space inserted between or after fields to meet alignment requirements.

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Examples

  • std::mem::size_of::<(i32, u8)>() is 8, not 5: the i32 takes bytes 0 to 3, the u8 byte 4, and 3 bytes of padding follow.

See also

alignment struct zero-sized type
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