The Virtual Modifier is used to mark that a method\property(ect) can be modified in a derived class by using the override modifier. Example: class A { public virtual void Foo() //DoStuff For A } class B : A { public override void Foo() //DoStuff For B //now call the base to do the stuff for … Read more
But what is the actual type of ‘return’ itself. It doesn’t have a type, it isn’t a value. Attempting typeof return; will give you Unexpected token return. So, we can pass comma separated expressions into the return statement. Is this a function? No, while parenthesis can be used to call a function, here they are … Read more
Yes, you just repeat the from … in clause: var words = from str in text from word in str.Split(‘ ‘) select word;
You should not define global variables in header files. You should define them in .c source file. If global variable is to be visible within only one .c file, you should declare it static. If global variable is to be used across multiple .c files, you should not declare it static. Instead you should declare … Read more
Table 4 (Keywords) in N3936 (C++14): alignas continue friend register true alignof decltype goto reinterpret_cast try asm default if return typedef auto delete inline short typeid bool do int signed typename break double long sizeof union case dynamic_cast mutable static unsigned catch else namespace static_assert using char enum new static_cast virtual char16_t explicit noexcept struct … Read more
None whatsover. They are synonyms supplied to make your code more readable: FUNCTION f IS … CREATE VIEW v AS SELECT …
No, file is not a keyword: >>> import keyword >>> keyword.iskeyword(‘file’) False The name is not present in Python 3. In Python 2, file is a built-in: >>> import __builtin__, sys >>> hasattr(__builtin__, ‘file’) True >>> sys.version_info[:2] (2, 7) It can be seen as an alias for open(), but it was removed in Python 3, … Read more
Use the new keyword when you want to refer to a class‘s own constructor: class Foo { } val f = new Foo Omit new if you are referring to the companion object’s apply method: class Foo { } object Foo { def apply() = new Foo } // Both of these are legal val … Read more
oneway is used with the distributed objects API, which allows use of objective-c objects between different threads or applications. It tells the system that it should not block the calling thread until the method returns. Without it, the caller will block, even though the method’s return type is void. Obviously, it is never used with … Read more
With infer, the compiler ensures that you have declared all type variables explicitly: type MyType<T> = T extends infer R ? R : never; type T1 = MyType<{b: string}> // T1 is { b: string; } Here we declare a new type variable R in MyType, which gets inferred from T. (Note, that infer is … Read more