Thread: create user define literal?

In C++ there are a number of primitives that are not defined in terms of other types. By this I'm thinking

int a = 1;
char b = 'M';
float c = 3.45f;
short d = 0xC3A3;

Is it possible to define your own literal? What I would like to do is have a hex literal for a data type where n = sizeof(data_type). If this type were a big integer, then I would want something like:

BigInt e = 0x13CA9B0C98D983E912DA0B0A9F87E0;

My goal is to assign a value from one contingous chunk of bytes and to not do it with a string.