Implementing Pure Functions

[Kagamin]

Andrei Alexandrescu Wrote:

> This has sparked an interesting discussion, to which I added my bit.

int fun(int a) pure { if (a > 10) writeln("I'm impure); }

As I understand, even if some calls to a function have some repeatability properties, this doesn't mean the function is pure. In this example fun is obviously impure. Here one can talk about allowing to call impure functions from pure ones, but that's a way different task.