CODEWITHSUNDEEP
c
chuckinator
chuckinator

Reputation: 21

c library defines of int8_t

From stdint.h the following

#ifndef int8_t

    typedef signed char int8_t;
    #define int8_t int8_t
    #define INT8_MIN (-128)
    #define INT8_MAX (127)

#endif

What does the #define int8_t int8_t do or define ?

Upvotes: 2

Views: 2865

Answers (1)

Keith Thompson
Keith Thompson

Reputation: 263237

It defines int8_t as a macro whose existence can be tested with #ifndef int8_t, presumably with the intent of preventing int8_t from being defined twice.

I don't know why it does it this way. It would make more sense to use a single include guard around the entire <stdint.h> header.

(In a previous version of this answer, I asserted that the implementation is non-conforming, since it defines int8_t as a macro. Doing so is unnecessary, but not invalid. Quoting N1570 7.1.3:

Each identifier with file scope listed in any of the following subclauses (including the future library directions) is reserved for use as a macro name and as an identifier with file scope in the same name space if any of its associated headers is included.

So the identifier int8_t is reserved for use as a macro, and the implementation's macro definition is permitted.)

What implementation is this from?

Upvotes: 1

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