Comment by qppo

That's the Linux way to do it

    union { int i; float f } u { .f = 1.23f };
    int i = u.i; 

Another way is a memcpy, which I believe is the most defined way to do type punning

    int i; 
    float f; 
    memcpy(&i, &f, 4);

But you also have to assume the size of those primitive types but that's pretty safe in modern C/C++.