c++ - Bit field memory -


if declare this

struct s{   unsigned int bit:4; }

how working?

  1. i allocate 2 bytes in memory(size of structure(got size here http://en.cppreference.com/w/cpp/language/bit_field) use 4 bits of it, , other memory in structure wasted.
  2. i allocate 4 bits, nothing more.

i'm confused , can't find info anywhere.

when write

s s;

you allocate sizeof (s) bytes, seems 2 in case.
fact use 4 bits of space not change size.


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