On 09/30/2014 10:35 AM, "Nordlöw" wrote:
> On Sunday, 28 September 2014 at 20:28:11 UTC, Jay wrote:
>> fwiw here's what i wrote:
>>
>> template New(T) if (is(T == class)) {
>> T New(Args...) (Args args) {
>> return new T(args);
>> }
>> }
>
> My try
>
> template New(T) if (is(T == class))
> {
> T New(Args...) (Args args) {
> return new T(args);
> }
> }
>
> unittest
> {
> class C { int x, y; }
> auto x = New!C;
> }
>
> fails as
>
> typecons_ex.d(60,16): Error: outer function context of
> typecons_ex.__unittestL64_4 is needed to 'new' nested class
> typecons_ex.__unittestL64_4.C
> typecons_ex.d(67,14): Error: template instance
> typecons_ex.New!(C).New!() error instantiating
Apparently, a class definition even inside a unittest blocks are
considered to be nested classes.
Normally, objects of nested classes are created by the 'this.new'
syntax, 'this' meaning the object that wraps the nested class.
class Outer
{
class Inner
{}
Inner makeInner()
{
return this.new Inner();
}
}
void main()
{
Outer o = new Outer;
Outer.Inner i = o.makeInner();
}
i contains a context pointer to its creators so that it can access the
outer object's members.
To make a nested class unnested, declare it as static, which seems to
work in your case as well:
class C { int x, y; }
auto x = New!C();
Ali
