On Thursday, 20 March 2014 at 16:40:50 UTC, Chris wrote:
On Thursday, 20 March 2014 at 16:32:34 UTC, Vladimir Panteleev
wrote:
On Thursday, 20 March 2014 at 16:28:46 UTC, Chris wrote:
How can I instantiate Person with Trait, i.e. a template with
a template?
struct Trait(T0, T1) {
T0 name;
T1 value;
T1[T0] map;
this(T0 name, T1 value) {
this.name = name;
this.value = value;
map[name] = value;
}
}
class Person(T) {
T traits[];
void addTrait(T trait) {
traits ~= trait;
}
}
void main()
{
auto trait1 = Trait!(string, string)("Name", "John");
auto trait2 = Trait!(string, int)("Age", 42);
writefln(%s", trait1.map);
writefln(%s", trait2.map);
// above code compiles and works
}
Person!(Trait!(string, string)) person;
-- or --
alias MyTrait = Trait!(string, string);
Person!MyTrait person;
Note that this approach won't let you have traits with
different parameters within the same Person type.
Yep, I've already tried this (sorry I should've mentioned it!).
But I don't want this restriction.
Arrays are homogeneous. All the elements must be of the same
type. Different instantiations of templates are different types.
You could use an array of std.variant.Variant
