Re: Head Const

[Timon Gehr via Digitalmars-d]

On 16.02.2016 01:14, H. S. Teoh via Digitalmars-d wrote:

Just out of curiosity, since we already have Rebindable in Phobos and
HeadConst is being proposed, what are the disadvantages / shortcomings
of a library solution that would justify adding yet another feature to
the language?

struct S{
    int[] a;
    void foo()headconst{
        a[0]=1; // ok
        // arr.length=2 // error
    }
}

void main(){
    headconst(S) s([0,2,3]);
    s.foo();
    assert(s.a==[1,2,3]);
}

How to do this in the library?