Is it safe to pass a uint32_t to a function which defines the input type as uint64_t?

Pass a uint32_t to a function that requires uint64_t: You can do this, and all compilers I know accept it, even in strict modes.

• Is it explicitly allowed by the standard?
• Is it safe?
• What does MISRA-C say about this?

void MyFunction(uint64_t arg) {}

int main(void) {
    uint32_t xyz = 1u;
    MyFunction(xyz);
}

You need to sign in to view this answers