What is the difference between the int types int8_t, int_least8_t and int_fast8_t?
What is the difference between the int types int8_t , int_least8_t and int_fast8_t ?
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What is the difference between the int types int8_t, int_least8_t and int_fast8_t?
The difference is defined in the sections of the C99 standard that Carl Norum quoted. But it may be useful to have an example.
Suppose you have a C compiler for a 36-bit system, with
char= 9 bits,short= 18 bits,int= 36 bits, andlong= 72 bits. Thenint8_tdoes not exist, because there is no way to satisfy the constraint of having exactly 8 value bits with no padding.int_least8_tis a typedef ofchar. NOT ofshortorint, because the standard requires the smallest type with at least 8 bits.int_fast8_tcan be anything. It’s likely to be a typedef ofintif the “native” size is considered to be “fast”.