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Padding added to have better memory alignment for faster memory access.
On 64-bit systems, pointers are 8 bytes. Compilers will align structure members to natural boundaries, so an 8-byte pointer will start at an offset in a structure that is a multiple of 8 bytes.
- rahul thakur July 12, 2014Since int is only four bytes, the compiler inserted 4 bytes of "padding" after foo, so that smap is on an 8-byte boundary.