c++ - sizeof packed bitfield returns 4 but I expect 1. How does it come and how I can fix? -

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i have bitfield defined follows (where expect of size: 1):

#pragma pack(push, 1) typedef struct {     unsigned boolfoo  : 1;     unsigned placeholder : 7; } knownbitflags1_t; #pragma pack(pop)

but after painfull debugging figgured out sizeof(knownbitflags1) returns 4 why?

i tried:

typedef struct {     unsigned boolfoo  : 1;     unsigned placeholder : 7; } __attribute__((packed, aligned(1))) knownbitflags1_t;

what keeps sizeof structure @ 4 anyway.

so can stop padding array of structure?

it depends on underlying type. change unsigned unsigned char:

typedef struct {     unsigned char boolfoo  : 1;     unsigned char placeholder : 7; } knownbitflags1_t;

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