Re: How to override impure function from pure function

[Nikhil Jacob via Digitalmars-d-learn]

On Tuesday, 13 December 2016 at 05:10:02 UTC, Nicholas Wilson 
wrote:
On Tuesday, 13 December 2016 at 04:48:11 UTC, Nikhil Jacob 
wrote:
In the D spec for pure functions it says that a pure function 
can override

"can override an impure function, but an impure function 
cannot override a pure one"

Can anyone help me how to do this ?

what this means is

class Foo
{
   void foo() { ... }
}

class Bar : Foo
{
    override void foo() pure { ... }
}

is allowed. but

int someglobal;
class Foo
{
   void foo() pure { ... }
}

class Bar : Foo
{
    override void foo()  { someglobal = 42; }
}

in not.

I mistook the original statement to mean that an impure function 
can be called from a pure function with some manual overrides.

Thank you for the clarification.