Assuming short is 2 bytes and int is 4 bytes on a 32 bit OS. Is the following an undefined behavior?
short s = 42;
int *p = (int*)(&s);
Assuming short is 2 bytes and int is 4 bytes on a 32 bit
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Assuming short is 2 bytes and int is 4 bytes on a 32 bit OS. Is the following an undefined behavior?
short s = 42;
int *p = (int*)(&s);
No, the code that you have posted does not exhibit undefined behavior but attempting to read
*pwould. Also, depending on the alignment requirements ofintandshort, the result of the cast may be unspecified and irreversable (see 5.2.10 [expr.reinterpret.cast] / 7).See ISO/IEC 14882:2011 3.10 [basic.lval] / 10:
The object that you are trying to access is a
shortand*pis a glvalue of typeintwhich doesn’t meet any of the above descriptions.