Question

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What does 'unsigned temp:3' means

A struct‘s definition goes like this,

typedef struct
{   
    uint32_t length : 8;  
    uint32_t offset : 24;
    uint32_t type : 8;
} A;

I haven’t seen this kind of definition before, what does it mean by :8 and :24?

Answer 1

It’s defining bitfields. This tells the compiler that length is 8 bits, offset is 24 bits and type is also 8 bits.