d coder <[email protected]> wrote:
Greetings
I want to find if a given struct type is instantiated from a
particular template struct type. For example:
struct S (T) {
alias T Type;
T t;
}
And later I want to find out if a given type is of type S(*)
(basically any type instantiated from template struct S). In fact I do
not know the type value T used at the time of instantiating S!(T).
I was looking at "is ( Type Identifier : TypeSpecialization ,
TemplateParameterList )" expression at
http://www.digitalmars.com/d/2.0/expression.html#IsExpression .
Thought there would be some way using that, but I could not find any.
If you know the template you want to check for, isExpression works:
S!int foo;
static if ( is( typeof(foo) f == S!T, T ) ) {
// Here, T == int, f == typeof(foo)
}
Note that the syntax "is ( Type Identifier : TypeSpecialization ,
TemplateParameterList )" is only usable inside static if.
--
Simen
