backwards-compatibility

Are FCM and GCM backward and forward compatible?

阅读更多关于 Are FCM and GCM backward and forward compatible?

问题 Google is deprecating Google Cloud messaging in favor of Firebase Cloud Messaging: Firebase Cloud Messaging (FCM) is the new version of GCM. It inherits the reliable and scalable GCM infrastructure, plus new features! See the FAQ to learn more. If you are integrating messaging in a new app, start with FCM. GCM users are strongly recommended to upgrade to FCM, in order to benefit from new FCM features today and in the future. From some tests I made on my servers, the FCM URL (https://fcm

Static analysis tool to detect ABI breaks in C++

阅读更多关于 Static analysis tool to detect ABI breaks in C++

问题 It's not very hard to break binary backwards-compatibility of a DSO/shared library with a C++ interface. That said, is there a static analysis tool, which can help detecting such ABI breaks, if it's given two different sets of header files: those of an earlier state of the DSO and those of the current state (and maybe DSOs as well)? Both free and commercial product suggestions are welcome. If it could also warn about bad practices, e.g. inline functions and defaulted function parameters in

PHP regex for validating a URL

阅读更多关于 PHP regex for validating a URL

问题 I'm looking for a decent regex to match a URL (a full URL with scheme, domain, path etc.) I would normally use filter_var but I can't in this case as I have to support PHP<5.2! I've searched the web but can't find anything that I'm confident will be fool-proof, and all I can find on SO is people saying to use filter_var. Does anybody have a regex that they use for this? My code (just so you can see what I'm trying to achieve): function validate_url($url){ if (function_exists('filter_var')){

Is JDK “upward” or “backward” compatible?

阅读更多关于 Is JDK “upward” or “backward” compatible?

Backward binary compatibility (or downward compatibility) - an ability of clients built with an old version of library API to run on a new one ( wiki ). Upward binary compatibility (or forward compatibility) - an ability of clients built with a new version of library API to run on old one ( wiki ). The general Sun's document about JDK Incompatibilities in J2SE 5.0 since 1.4.2 (and Java SE 6 compatibility with J2SE 5.0 too) describes the compatibility of JDK as following: JDK 5.0 is upwards binary-compatible with Java 2 SDK, v1.4.2 except for the incompatibilities listed below. This means that,

Weak Linking - check if a class exists and use that class

阅读更多关于 Weak Linking - check if a class exists and use that class

I'm trying to create a universal iPhone app, but it uses a class defined only in a newer version of the SDK. The framework exists on older systems, but a class defined in the framework doesn't. I know I want to use some kind of weak linking, but any documentation I can find talks about runtime checks for function existence - how do I check that a class exists? Senseful TLDR Current: Swift : if #available(iOS 9, *) Obj-C, iOS : if (@available(iOS 11.0, *)) Obj-C, OS X : if (NSClassFromString(@"UIAlertController")) Legacy: Swift (versions prior to 2.0) : if objc_getClass("UIAlertController") Obj

Can program developed with Java 8 be run on Java 7?

阅读更多关于 Can program developed with Java 8 be run on Java 7?

问题 I am a little confused. Oracle says Java 8 is highly compatible with Java 7 (backward). But, what possibilities exist that Java 8 program can be run on Java 7 successfully (SE/EE)? If point one was true, Java 8 applications will be deployed and executed on a Java 7 server support? for example, Tomcat 8 or WildFly? 回答1: In general, no. The backwards compatibility means that you can run Java 7 program on Java 8 runtime, not the other way around. There are several reasons for that: Bytecode is

std::vector, default construction, C++11 and breaking changes

阅读更多关于 std::vector, default construction, C++11 and breaking changes

问题 I ran today against a quite subtle issue I\'d like to have your opinion on. Consider the following garden-variety shared-body-idiom class: struct S { S() : p_impl(new impl) {} private: struct impl; boost::shared_ptr<impl> p_impl; }; The fun appears when you try to put those into vectors in the following way: std::vector<S> v(42); Now, with MSVC 8 at least, all the elements in v share the same impl member. Actually, what causes this is the vector constructor: template <typename T, typename A =

Detect IE8 Compatibility Mode [duplicate]

阅读更多关于 Detect IE8 Compatibility Mode [duplicate]

问题 Possible Duplicate: Differentiate IE7 browser and browser in IE7 compatibility mode We have not had time to fully test IE8 with our fairly extensive system. We are also reaching the point at which we can\'t prohibit the use of IE8. Our users are stubborn and not terribly sophisticated, so we don\'t feel that we can tell them to use the \"Compatibility Mode\" button. Instead, we will add the \"IE=EmulateIE7\" meta tag as a temporary fix. The problem is that when this tag is used, the browser

How to deal with deprecated classes in Android to keep compatibility

阅读更多关于 How to deal with deprecated classes in Android to keep compatibility

问题 I am getting back to work on an app I worked on a while ago, when I had everything built around Android 2.2 Froyo. I have updated my SDK for the latest APIs and noticed that the ClipboardManager features I was using are deprecated. I updated the code to use the newer ClipData model and tried it out on my Froyo phone and, of course, I get a NoClassDefFoundError in the new code. I\'ve had a look around SO and haven\'t found any real discussions of general strategy for maintaining backwards

Material Design, AppCompat, and Backwards Compatibility

阅读更多关于 Material Design, AppCompat, and Backwards Compatibility

问题 I\'m trying to understand the principles of using Material Design a bit better (I\'m new to this area and have been reading documentations and tutorials, but the subject is still a bit vague to me), and I\'ll be glad for some help. What I\'ve tried so far is having 2 folders (values and values-21) with a styles.xml file per each of them - values/styles.xml: <style name=\"AppTheme\" parent=\"Theme.AppCompat.Light.NoActionBar\"></style> values-v21/styles.xml: <style name=\"AppTheme\" parent=\