I can't recall if you can do this with structs, but if you use classes,
you should be able to define a "Date Part" class that has all of the
methods and data you want. Then, you just derive three sub-classes.
For example (and I hope the syntax is right):
class DatePart
{
this(int f)
{
_foo = f;
}
int asNumber() { return _foo; }
immutable int _foo;
}
class Year: DatePart {}
class Month: DatePart {}
class Day: DatePart {}
Casey
On 08/14/2010 08:47 PM, Yao G. wrote:
Hello.
Is there an alternative to typedef? I need to define three structs that
have exactly the same methods and properties, yet represent different
stuff.
Example:
---
struct Foo
{
this( int f ) {
_foo = f;
}
int asNumber() {
return _foo;
}
private immutable int _foo;
}
// This should be typedef, but as it's going to be deprecated...
alias Foo Year;
alias Foo Month;
alias Foo Day;
void bar( Year y, Month m, Day d ) {
// ...
}
// This should compile, obviously.
bar( Year(2010), Month(8), Day(14) );
// But this shouldn't
bar( Day(1), Year(1), Month(1) );
---
So, what options do I have? I know that typedef is scheduled to
deprecation, so I would like to know if there's something else.
