On 27/09/2015 3:14 AM, cym13 wrote:
On Saturday, 26 September 2015 at 17:08:00 UTC, Nordlöw wrote:
Why is the following code not pure:
float x = 3.14;
import std.conv : to;
auto y = x.to!string;
???
Is there a reason for it not being pure? If not, this is a serious
problem as this is such a fundamental function.
Probably because it uses C's float formatting functions, and they
probably set errno and therefore aren't pure.
Maybe because of floating point numbers uncertainty that would cause the
resulting string to be different for two equivalent inputs? I can't seem
to put an example together though.
No, it doesn't work like that.
