Making your own suffix number like 1.2f and 8589934592L but for larger number than long long

[Gyiove]

Hello everyone!

My wish is to pass larger number than long long (64bit) to function.
For passing long long we have to but L to the end of the number but
the question is that can i create my own custom tag or sign to handle
even bigger number?

example:

// long long
void longlongfunc( long long in );
// my own invention
void myintfunc( myint in );

int main() {

longlongfunc(8589934592L);
myintfunc(1099511627776M);
return 0
}

Edit:

I found out that what i wanted is suffix number and i found out that
the max value of it can be long long or unsigned long long.

Is there any trick or something that i could pass a number like this:
1099511627776 for example.

Thanks!

[Peter87]

You could create your own user-defined literals ...

http://en.cppreference.com/w/cpp/language/user_literal

... but you still need a type that can handle large numbers like that. Create your own class that uses multiple integer values internally, or use a library like GMP or Boost.Multiprecision.

https://gmplib.org/
http://www.boost.org/doc/libs/1_57_0/libs/multiprecision/doc/html/index.html

[kbw]

Sounds like you need to use a bigint class.

[Gyiove]

as i understood correctly that there is just no way to do this:

myintfunc(1099511627776M);

Because the largest thing that can be is long long as there were told.
I can create class that hold 128 or more bit value easily but using this = operator
to set is not the option then?
The only way would be
= "1099511627776"
Am i right or is there another way?

[kbw]

You've been asked to hold a number larger than the supported built in type. But a user defined type can be used that implements a larger value.

[Cubbi]

You can do myintfunc(1099511627776_M); (note the underscore, user-defined literals must use it). And yes, your operator""_M will have to return some custom type (or at least a boost multiprecision type) (Edit: if that number were actually too big for 64 bit, thank you Peter87!)

[Peter87]

You realize 1099511627776 is small enough to be stored in a 64 bit variable?

[Gyiove]

@Peter87 you're right but this is just an example number.
If you feel better then the new number can be 4294967296*4294967296*256 :)