[Issue 1996] New: is ( Type Identifier : TypeSpecialization ) deduction error with inheritance
d-bugmail at puremagic.com
d-bugmail at puremagic.com
Mon Apr 14 20:25:17 PDT 2008
http://d.puremagic.com/issues/show_bug.cgi?id=1996
Summary: is ( Type Identifier : TypeSpecialization ) deduction
error with inheritance
Product: D
Version: 1.028
Platform: PC
OS/Version: Windows
Status: NEW
Severity: normal
Priority: P2
Component: DMD
AssignedTo: bugzilla at digitalmars.com
ReportedBy: wbaxter at gmail.com
expressions of the form
is(Type U : Foo!(U))
do not work when Type is derived via inheritance from the template.
-----
module iface_specialize;
abstract class ACFoo(T)
{
void init(T);
void term();
void blah();
void bleh();
}
class CFoo(T)
{
void init(T) {}
void term() {}
void blah() {}
void bleh() {}
}
interface Foo(T)
{
void init(T);
}
class IsFoo(T) : Foo!(T)
{
override void init(T x) { }
}
class IsACFoo(T) : ACFoo!(T)
{
void init(T x) { }
}
class IsCFoo(T) : CFoo!(T)
{
void init(T x) { }
}
void main()
{
alias IsFoo!(float) IsFoof;
alias IsCFoo!(float) IsCFoof;
alias IsACFoo!(float) IsACFoof;
// These are ok
static if (! is(IsFoof : Foo!(float))) {
pragma(msg, "FAIL: IsFoof *is* a Foo!(float)");
}
static if (! is(IsCFoof : CFoo!(float))) {
pragma(msg, "FAIL: IsCFoof *is* CFoo!(float)");
}
static if (! is(IsACFoof : ACFoo!(float))) {
pragma(msg, "FAIL: IsACFoof *is* ACFoo!(float)");
}
// These fail
static if (! is(IsFoof T : Foo!(T))) {
pragma(msg, "FAIL: IsFoof *is* a Foo!(T) for some T [float]");
}
static if (! is(IsCFoof T : CFoo!(T))) {
pragma(msg, "FAIL: IsCFoof *is* a CFoo!(T) for some T [float]");
}
static if (! is(IsACFoof T : ACFoo!(T))) {
pragma(msg, "FAIL: IsACFoof *is* a ACFoo!(T) for some T [float]");
}
}
--
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