It depends on your JVM implementation. According to the Java VM specification it is undefined behavior if the object is not Throwable. The objectref must be of type reference and must refer to an object that is an instance of class Throwable or of a subclass of Throwable. In section 6.1, “The Meaning of ‘Must’”: … Read more
Like this: console.warn(‘Hi!’); Note that unlike exceptions, this will not interrupt your code; the calling function will continue normally. Also note that this will throw an error in any browser except for WebKits or Firefox with Firebug, because console won’t exist. To fix that, you can include Firebug Lite, or make a fake NOP-ing console … Read more
Let’s say I use a generator to handle adding information to a database; I use this to store network-received information, and by using a generator I can do this efficiently whenever I actually receive data, and do other things otherwise. So, my generator first opens a database connection, and every time you send it something, … Read more
You should catch the exception when you are in the method that knows what to do. For example, forget about how it actually works for the moment, let’s say you are writing a library for opening and reading files. So you have a class, say: public class FileInputStream extends InputStream { public FileInputStream(String filename) { … Read more
This continues to occur in SQL Server 2014. I have found that putting the semi-colon at the end of BEGIN helps. This approach has the error IF ‘A’=’A’ BEGIN THROW 51000, ‘ERROR’, 1; END; And this approach does not have the error IF ‘A’=’A’ BEGIN; THROW 51000, ‘ERROR’, 1; END;
No, because there are no checked exceptions in C# If you are trying to document exceptions that are thrown, use the standard xml documentation /// <exception cref=”InvalidOperationException”>Why it’s thrown.</exception>
Exception specifiers were deprecated because exception specifiers are generally a terrible idea. noexcept was added because it’s the one reasonably useful use of an exception specifier: knowing when a function won’t throw an exception. Thus it becomes a binary choice: functions that will throw and functions that won’t throw. noexcept was added rather than just … Read more
According to the standard, 5.16 paragraph 2 first point, “The second or the third operand (but not both) is a throw-expression (15.1); the result is of the type of the other and is an rvalue.” Therefore, the conditional operator doesn’t care what type a throw-expression is, but will just use the other type. In fact, … Read more
Instead of guessing, I decided to actually look at the generated code with a small piece of C++ code and a somewhat old Linux install. class MyException { public: MyException() { } ~MyException() { } }; void my_throwing_function(bool throwit) { if (throwit) throw MyException(); } void another_function(); void log(unsigned count); void my_catching_function() { log(0); try … Read more
No. Here are several examples why: Template code is impossible to write with exception specifications, template<class T> void f( T k ) { T x( k ); x.x(); } The copies might throw, the parameter passing might throw, and x() might throw some unknown exception. Exception-specifications tend to prohibit extensibility. virtual void open() throw( FileNotFound … Read more