backwards-compatibility

问题 Is adding a variadic parameter to an existing Go function a breaking change? For example: // Old function func Foo(a int) // Updated to: func Foo(a int, params ...string) Callers of the API can omit the new parameter, so I would think the API is backwards-compatible. Can anyone provide an example where a user of the old API could not use the new API without changing their code? 回答1: I. Changing functions Calling them will continue to work without modification, but since the function

问题 TLDR: How do I create WCF services that are backward compatible -- that is, when I deploy a new version of the service on the server-side, all the clients on the older versions can still use the service. I'm creating a web service that will allow the client applications to fetch a listing of plugins. I will at least have one operation like FindPlugins(string nameOrDescription) which will, on the server, do a search and return a list of objects. Unfortunately, I cannot guarantee that my

问题 TLDR: How do I create WCF services that are backward compatible -- that is, when I deploy a new version of the service on the server-side, all the clients on the older versions can still use the service. I'm creating a web service that will allow the client applications to fetch a listing of plugins. I will at least have one operation like FindPlugins(string nameOrDescription) which will, on the server, do a search and return a list of objects. Unfortunately, I cannot guarantee that my

问题 I was using xgboost version 0.6 when I pickled some pickle objects. Now I upgraded to version 0.82 and when I'm trying to unpickle the old models I get: AttributeError: 'XGBClassifier' object has no attribute 'kwargs' I would really like to use these model without re training them, is there any way to open these pickles? 回答1: The new xgboost requires that objects will have a "kwargs" attribute, which old models do not have. One way to solve this is to downgrade to the old xgboost version,

问题 I was using xgboost version 0.6 when I pickled some pickle objects. Now I upgraded to version 0.82 and when I'm trying to unpickle the old models I get: AttributeError: 'XGBClassifier' object has no attribute 'kwargs' I would really like to use these model without re training them, is there any way to open these pickles? 回答1: The new xgboost requires that objects will have a "kwargs" attribute, which old models do not have. One way to solve this is to downgrade to the old xgboost version,

问题 Can I run a MVC 1 application using the MVC 2 assemblies without a hitch? I understand that some 3rd party tools have had stuff broken in MVC 2, but let's assume I'm not using those any other tools. 回答1: There have been breaking changes. If you want a 1.0 project to run on 2.0, it does look for things in different places; so you'd have to migrate the application to 2.0.. Here are the changes that could possibly 'break' (current as of Preview 2): Changes in Preview 2 Helpers now return an

问题 By now all Mac App Store developers know that all apps must have the new OSX Lion Sandboxing enabled going forward. For existing apps, we must enable it in XCode 4.2 and set in place the data migration plist. So my existing Mac App Store app has a build target of OSX 10.6.8 Snow Leopard. Not only that, but it does access the webcam and also synchronizes stuff to iCal via CalendarStore API and AppleScript. I'm expecting most of my app to break when I enable the Sandbox, but when I get that

问题 By now all Mac App Store developers know that all apps must have the new OSX Lion Sandboxing enabled going forward. For existing apps, we must enable it in XCode 4.2 and set in place the data migration plist. So my existing Mac App Store app has a build target of OSX 10.6.8 Snow Leopard. Not only that, but it does access the webcam and also synchronizes stuff to iCal via CalendarStore API and AppleScript. I'm expecting most of my app to break when I enable the Sandbox, but when I get that

问题 By now all Mac App Store developers know that all apps must have the new OSX Lion Sandboxing enabled going forward. For existing apps, we must enable it in XCode 4.2 and set in place the data migration plist. So my existing Mac App Store app has a build target of OSX 10.6.8 Snow Leopard. Not only that, but it does access the webcam and also synchronizes stuff to iCal via CalendarStore API and AppleScript. I'm expecting most of my app to break when I enable the Sandbox, but when I get that

问题 By now all Mac App Store developers know that all apps must have the new OSX Lion Sandboxing enabled going forward. For existing apps, we must enable it in XCode 4.2 and set in place the data migration plist. So my existing Mac App Store app has a build target of OSX 10.6.8 Snow Leopard. Not only that, but it does access the webcam and also synchronizes stuff to iCal via CalendarStore API and AppleScript. I'm expecting most of my app to break when I enable the Sandbox, but when I get that