isCallable is not an expression

[Ali Çehreli via Digitalmars-d-learn]

On 09/24/2014 01:11 AM, andre wrote:

 > template MyTemplate()
 > {
 >      import std.traits : isSomeFunction, functionAttributes,
 > FunctionAttribute, ReturnType;
 >
 >      string[] getPropertyNames()

1) You need a "this template parameter":

     string[] getPropertyNames(this MyType)()

2) Now, replace all typeof(this) expressions with MyType below.

 >      /*string[] getPropertyDuplicate()

3) Same here:

     string[] getPropertyDuplicate(this MyType)()

And it works! :)

class A {
     mixin MyTemplate;
     @property int zzz()
     {
         return 42;
     }
}

void main() {
     auto a = new A();

     import std.string;
     assert(a.getPropertyNames() == [ "zzz" ]);
     assert(a.getPropertyDuplicate() == [ "zzz" ]);
}

Ali