Re: struct and default constructor

[via Digitalmars-d]

On Friday, 10 October 2014 at 01:32:54 UTC, dcrepid wrote:
On Sunday, 27 November 2011 at 19:50:24 UTC, deadalnix wrote:
Hi,
I wonder why struct can't have a default constructor...

I know this is an old thread, but I've run into this same 
problem recently and search yielded this result.

I myself have tried working around the default-constructor 
problem with things like

this(bool bInit = true)

- which of course doesn't get invoked with MyStruct(), even 
with @disable this.

You can use `static opCall` as a workaround. The following prints 
"S(0)" and "S(3)":

    struct S {
        int x;
        static S opCall() {
            S s;
            s.x = 3;
            return s;
        }
    }

    void main() {
        import std.stdio;
        S s;
        writeln(s);
        S t = S();
        writeln(t);
    }

But if you add a constructor with parameters, you get an error:

    struct S {
        int x;
        static S opCall() { ... }
        this(int y) { x = y; }
    }

xx.d(4): Error: struct xx.S static opCall is hidden by 
constructors and can never be called
xx.d(4):        Please use a factory method instead, or replace 
all constructors with static opCall.

IMO this is too restrictive, as obviously, the static opCall is 
_not_ hidden by the constructor.