Wondering about the purpose to announce ObservableSettings following Singleton

[Schmidt]

Hi all developers of Quantlib
My name is Schmidt, and I'm working for an Asia local bank. I just stepped into studying Quantlib for weeks. and now having a question about Class ObservableSettings. I'm wondering the purpose to announce it following Singleton pattern. Is it because that we'll only have market-data type variables to be observable, then all these market-data must apply the same Enable & Deferred updates settings. Cos now I'm thinking about if I have two types of variable observable, and I want them to be under different ObservableSettings, it seems can't be applicable with ObeservableSettings' Singleton pattern right?

[Luigi Ballabio]

Right, coding it as a singleton makes it a global setting.  If you wanted two groups, you'd have to change the patters (and also to find a way to assign each observable to one of the two groups).

Luigi

On Sat, Mar 26, 2016 at 12:19 PM Schmidt <[hidden email]> wrote:

Hi all developers of Quantlib
My name is Schmidt, and I'm working for an Asia local bank. I just stepped
into studying Quantlib for weeks. and now having a question about Class
ObservableSettings. I'm wondering the purpose to announce it following
Singleton pattern. Is it because that we'll only have market-data type
variables to be observable, then all these market-data must apply the same
Enable & Deferred updates settings. Cos now I'm thinking about if I have two
types of variable observable, and I want them to be under different
ObservableSettings, it seems can't be applicable with ObeservableSettings'
Singleton pattern right?




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