• RuZzz (14/14) Jan 20 2015 Alexandrescu "The_D_Programming_Language"
• Rikki Cattermole (11/25) Jan 20 2015 I'm guessing something along these lines:
• bearophile (5/6) Jan 20 2015 A Phobos patch:
• Kagamin (2/2) Jan 20 2015 Probably borrowed from java:

"RuZzz" <xruzzzz gmail.com> writes:

Alexandrescu "The_D_Programming_Language"
page 264: 7.1.10 Subtyping with structs. The  disable Attribute
import std.stdio;
...
unittest {
auto a = Final!Widget(new Widget);
a.print(); // Fine, just print a
auto b = a; // Fine, a and b are bound to the same Widget
a = b; // Error!
// opAssign(Finai!Widget) is disabled!
a = new Widget; // Error!
// Cannot assign to rvatue returned by get()!
}

What is the "Final" in the code?

Rikki Cattermole <alphaglosined gmail.com> writes:

On 21/01/2015 12:58 a.m., RuZzz wrote:
 Alexandrescu "The_D_Programming_Language"
 page 264: 7.1.10 Subtyping with structs. The  disable Attribute
 import std.stdio;
 ...
 unittest {
 auto a = Final!Widget(new Widget);
 a.print(); // Fine, just print a
 auto b = a; // Fine, a and b are bound to the same Widget
 a = b; // Error!
 // opAssign(Finai!Widget) is disabled!
 a = new Widget; // Error!
 // Cannot assign to rvatue returned by get()!
 }

 What is the "Final" in the code?

I'm guessing something along these lines:

struct Final(T) {
	private T value;
	alias value this;

	this(T value) {
		this.value = value;
	}

	 disable
	void opAssign(T)(T t) {}
}

"bearophile" <bearophileHUGS lycos.com> writes:

Rikki Cattermole:

 I'm guessing something along these lines:

A Phobos patch:
https://github.com/D-Programming-Language/phobos/pull/2881

Bye,
bearophile

"Kagamin" <spam here.lot> writes:

Probably borrowed from java: 
http://docs.oracle.com/javase/specs/jls/se8/html/jls-4.html#jls-4.12.4