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storing my struct in a Value [message #807]

Fri, 03 February 2006 10:13

hojtsy
Messages: 241
Registered: January 2006
Location: Budapest, Hungary

Experienced Member

How do I pass this struct inside a Value? Are there some preprocessor macros or inheritance needed for a type to storable inside a Value? How do I "cast" a Value back to my type?

struct MyType
{
  String s;
  Color bg, fg;
};

I am trying to use this type as the cell data in ArrayCtrl.

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Re: storing my struct in a Value [message #808 is a reply to message #807]

Fri, 03 February 2006 10:21

mirek
Messages: 13975
Registered: November 2005

Ultimate Member

Value v = RawToValue(x);

const MyType& y = ValueTo<MyType>(v);

- requires MyType to have full-copy (you can assign types with pick using RawPickToValue)

- there are two levels of Value compliance - raw types just get stored and retrieved, while "rich" value types support other operations - test for Null, equality comparison (including casts to similar types like Date<->Time, int<->double), serialization and casts to similar types.

- you can also make your type more compatible by adding operator Value and constructor from Value

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Re: storing my struct in a Value [message #809 is a reply to message #807]

Fri, 03 February 2006 10:22

mirek
Messages: 13975
Registered: November 2005

Ultimate Member

...see reference/Value....

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Re: storing my struct in a Value [message #811 is a reply to message #809]

Fri, 03 February 2006 10:44

hojtsy
Messages: 241
Registered: January 2006
Location: Budapest, Hungary

Experienced Member

How could I ensure that the number I put to AssignValueTypeNo is unique? The numbers used by the library seems just random (9, 34, 39, 40, 50, 70, 150). Is there a range reserved for the library for future use?

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Re: storing my struct in a Value [message #813 is a reply to message #811]

Fri, 03 February 2006 11:00

mirek
Messages: 13975
Registered: November 2005

Ultimate Member

Ahh, I see you are several steps further now:)

In debug mode, RichValue::Register() checks whether the value is unique.

We have not set any official ranges yet... But all current assignments for the library itself are say < 256. Make yours >65536 and everything will be ok.

Mirek

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