[Issue 1681] New: cast(real) ulong.max == 0

[Xinok]

Real is a floating point type, typically 80 bits. Ulong is a 64-bit 
integer type. Real is not capable of holding a value as large as 
ulong.max. That is why the assert fails.

d-bugmail at puremagic.com wrote:
> http://d.puremagic.com/issues/show_bug.cgi?id=1681
> 
>            Summary: cast(real) ulong.max == 0
>            Product: D
>            Version: 2.007
>           Platform: PC
>         OS/Version: Linux
>             Status: NEW
>           Severity: normal
>           Priority: P2
>          Component: DMD
>         AssignedTo: bugzilla at digitalmars.com
>         ReportedBy: andrei at metalanguage.com
> 
> 
> The title says it all. Here's a test:
> 
> import std.stdio;
> import std.conv;
> 
> void main()
> {
>     real r = ulong.max;
>     ulong d = cast(ulong) r;
>     writeln(d);
>     assert(d == ulong.max); // should not fail
> }
> 
>