Initializing a double to INT_MAX + 1

[monarch_dodra]

Hi,

I'd like to set a double's start value at the maximum possible value a int can hold, +1.

i.e., if the int is 32 bit long, I'd like to write:

double a = 0x100000000;

However, I get a compile error of "integer constant is too large for "long" type "
At best, I can write this:

double a = static_cast<double>(0xffffffff) + 1;

Also, since I'd like the code to be portable, using 0xffffffff doesn't really work, so I use this:

double b = static_cast<double>(static_cast<unsigned int>(-1)) + 1;

This not only doesn't look very clean, I'm pretty sure it's not even accurate if my long is 8 bytes. Also, I'd like my double to be evaluated at compile time, not run time.

Can anybody help?

I thought at worst, I can do something like:

double c = pow(2,8*sizeof(int));

But I'd like to avoid anything that excessive (plus it is probably not evaluated at compile time).