I'm elevating this from D.Learn [1] because I think it needs some
input from the language designers.
This code compiles and executes:
-----------------------------------
import std.stdio;
struct StaticRegister {
static private uint _value;
@property static uint value() { return _value; }
@property static void value(uint v) { _value = v; }
static alias value this;
static void test() {
writeln(this.stringof);
writeln(typeof(this).stringof);
writeln(this.value);
}
}
void main(string[] s) {
// works due to `alias value this`
StaticRegister = 1;
StaticRegister.test();
}
-----------------------------------
Output:
StaticRegister
StaticRegister
1
However, this code fails to compile:
-----------------------------------
struct StaticRegister {
static void test() {
assert(this is null);
}
}
void main(string[] s) {
StaticRegister.test();
}
-----------------------------------
Output:
test.d(5): Error: 'this' is only defined in non-static member
functions, not test
To make things more confusing, Bug 380 [2] apparently provided a
fix for `this` not evaluating in a static context, but it was a
D1 bug and may not apply to D2.
Is `this` overloaded to mean "this class" in a static context or
is `this` only valid in a non-static context. Please clarify,
and if it's a bug, help me understand so I can make an accurate
and actionable bug report.
Thanks for the help,
Mike
[1] - "static alias this" thread on D.Learn -
http://forum.dlang.org/post/[email protected]
[2] - Bug 380 - https://issues.dlang.org/show_bug.cgi?id=380
