Re: Initialization of structure field w/o default ctor

[Kenji Hara via Digitalmars-d-learn]

On Thursday, 22 January 2015 at 12:45:53 UTC, drug wrote:
On 22.01.2015 15:30, bearophile wrote:
drug:
Also can I avoid "dummy" non-default ctor for Bar?

One solution:


struct Foo {
    int foo;

    @disable this();

    this(int foo_) pure nothrow @safe @nogc {
        this.foo = foo_;
    }
}

struct Bar {
    enum arraySize = 3;

    Foo[arraySize] foo = Foo(1);
}

void main() @safe {
    import std.stdio;

    Bar bar;
    bar.writeln;
}


Bye,
bearophile

Yes, that's what the doctor prescribed. Thank you!

Or you can use block assignment in the constructor.

struct Bar
{
    enum ArraySize = 3;

    Foo[ArraySize] foo;

    this(string dummy) // <== here because compiler demands to 
initialize field foo
    {
        import std.algorithm: fill;

        //fill(foo[], Foo(0));
        foo[] = Foo(0);   // <== OK
    }
}

Compiler can recognize the block assignment as a construction for 
the field Bar.foo.

Kenji Hara