You can’t, unless you find a platform with an
int that’s larger than 32 bits (they are at the time of writing rare).
If you need to use a
signed type, then
std::int64_t is a good choice. Or
long long is also guaranteed to be large enough.
If you’re absolutely constrained by the interface to your function then you could break your number up into two parts – and adopt the convention that you need to call the function twice to get anything meaningful out of it. But that could make your program very brittle.
Another option: if your function is allowed to take the
int by reference then you could have an array of two
ints at the call site, and pass the first one to your function. You can then reach the other using pointer arithmetic within the function body! Again, this will make your code brittle but it would work.
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