Re: const member function

[rumbu via Digitalmars-d-learn]

On Saturday, 21 February 2015 at 07:01:12 UTC, Baz wrote:
---
class S
{
    private SomeType cache;
    public const(SomeType) SomeProp() @property
    {
       if (cache is null)
         cache = SomeExpensiveOperation();
       return cache;
    }
}
---

the result of the getter will be read-only

My intention is not to have a read-only getter, I want to call 
SomeProp on a const object:

class S
{
    private int cache = -1;
    private int SomeExpensiveOp() { return 12345; }

    public @property const(int) SomeProp()
    {
        if (cache = -1)
            cache = SomeExpensiveOp();
        return cache;
    }
}

unittest
{
    const(S) s = new S();
    auto i = s.SomeProp;  //mutable method S.SomeProp is not 
callable using a const object
}