backwards-compatibility

问题 I have to built a project in Symbian. I am having and confusion and had some question related to Symbian version. What is the difference between Symbian^3 , S60 3rd edition and S60 5th edition ? Is there any major difference as coding point of view with Symbian^3, S60 3rd edition, S60 5th edition? Does the code built in S60 3rd edition will work in S60 5th edition or code built in Sybmian^3 will work in S60 3rd edition, S60 5th edition or vice versa? Which IDE do we have to use for Symbian^3,

问题 Now that Visual Studio 2015 RC is out, has anyone installed it and opened Visual Studio 2013 projects/solutions? Does it ask the files to be changed? If yes, are the changes it makes backward compatible? 回答1: Take a look at the Porting, Migrating, and Upgrading Visual Studio Projects article for Visual Studio 2015. All of the various caveats are described there. 回答2: Not all types of project are supported. I tried the following 4 project types: Vb.net Class project, OK. Vb.net Web Services

问题 I started building an app with protobuf 2.2.0 as it was the latest. Now I'm considering upgrading to protobuf 2.4.0a which is the latest. If I do so will the messages generated by one version of the app still be readable by the other version for the same schema? Or would I be breaking something? 回答1: That should be fine. Version 2.1.0 introduced packed repeated fields, but I don't believe there have been any wire format changes since then. 来源： https://stackoverflow.com/questions/4963620/are

问题 I'm currently using hash on tuples of integers and strings (and nested tuples of integers and strings etc.) in order to compute the uniqueness of some objects. Barring that there might be a hash collisions, I wonder - is the hash function on those data types guaranteed to return the same result for different versions of Python? 回答1: No. Apart from long-standing differences between 32- and 64-bit versions of Python, the hashing algorithm was changed in Python 3.3 to resolve a security issue:

问题 I have inherited an application that is running on JBoss 2.4.3 (which I believe is EJB spec 2.0 compatible), and I'm running into quite a few issues (like being able to use modern log4j "Logger" apis [JBoss 2.4 specific issues pushing me to upgrade]). I understand that I should be able to use a EJB 2.1 container (Jboss 4) without issue, but should I expect to be able to go further? What are the backwards compatibility requirements for EJB? Are they meant to be backwards compatible through

问题 I do have Windows 7 32-bit (Ultimate), this is a screen shot that shows the systems features: I need to install visual studio 2013 but it shows this dialog: I guess that this problem can be solved by installing some required files that makes Windows 7 functions as Windows 8. 回答1: According to the System Requirements, you need to install Windows 7 Service Pack 1, which (judging by your screen shot) you are currently not running. 回答2: You need to install Windows 7 sp1. The System Requirements

问题 One of selling points of Protobuf was backward compatibility, i.e. developers can evolve format, and older clients can still use it. Now with new Protobuf version called proto3, the IDL language itself is not compatible as such things as options , required where dropped, new syntax for enuns, no extention. Does it mean that using proto3 there's no way to produce binary that older proto2 would read/understand also? It is like you have to continue to use proto2. If you start using proto3, you

问题 I have an existing method (or function in general) which I need to grow additional functionality, but I don't want to break any use of the method elsewhere in the code. Example: int foo::bar(int x) { // a whole lot of code here return 2 * x + 4; } is widely used in the codebase. Now I need to make the 4 into a parameter, but any code that already calls foo::bar should still receive what it expects. Should I extend and rename the old method and wrap it into a new one like int foo::extended_bar

问题 In my project I need to change Jackrabbit 1.3 to Jackrabbit 2.1.1. My work is to work for queries. Please suggest me if there are changes in index format and query format. Lucene 2.4 is used in Jackrabbit 2.1.1 while in Jackrabbit 1.3 Lucene 2.2 is used. 回答1: Lets divide your upgrade into the following parts: Upgrade 1.3 to 1.5 (see Class IndexMigration): IndexMigration implements a utility that migrates a Jackrabbit 1.4.x index to version 1.5. Until version 1.4.x, indexes used the character

问题 I've searched and couldn't find anything to suggest that Spring 4.0.0 is not fully backward compatible with Spring 3.x. Is that indeed the case? 回答1: There are few API they have removed in the new version. You would not have any surprise changes with the new version, there could be slight changes in the API. But, you have to watch the deprecated APIs which will be the candidate for removal in the forthcoming versions. Look at this document , they have included few backward compatibility