Le 04/08/2012 23:09, Jonathan M Davis a écrit :
At present (though it didn't used to work this way until about 4 months ago -
the change is in 2.060), a number of std.traits templates - including
isSomeString - evaluate to false for enums. So,
enum E : string { a = "hello" }
static assert(isSomeString!(E.a));
will fail. This is in spite of the fact that
auto func(string a) {...}
will accept E.a without complaint. So, if you change
auto func(string a) {...}
to
auto func(T)(T a) if(isSomeString!T) {...}
[...]
- Jonathan M Davis
E;A is a string. By definition. So isSomeString must be true.
However,
T foo(T)(T t) if (isSomeString!T) {
return t ~ t[0];
}
must trigger an error when T is an enum type. if t has type E, which
implicitly cast to string, t ~ t[0] must have type string and not E.
So the given sample code should trigger a compile time error about
inconsistent return type.
The same goes for other enums operations.
