A non-static member function must be called with an object. That is, it always implicitly passes “this” pointer as its argument. Because your std::function signature specifies that your function doesn’t take any arguments (<void(void)>), you must bind the first (and the only) argument. std::function<void(void)> f = std::bind(&Foo::doSomething, this); If you want to bind a function … Read more
A virtual function makes its class a polymorphic base class. Derived classes can override virtual functions. Virtual functions called through base class pointers/references will be resolved at run-time. That is, the dynamic type of the object is used instead of its static type: Derived d; Base& rb = d; // if Base::f() is virtual and … Read more
Yes, consider some of these examples: package main import “fmt” // convert types take an int and return a string value. type convert func(int) string // value implements convert, returning x as string. func value(x int) string { return fmt.Sprintf(“%v”, x) } // quote123 passes 123 to convert func and returns quoted string. func quote123(fn … Read more
I recommend that you use the standard packages email and smtplib together to send email. Please look at the following example (reproduced from the Python documentation). Notice that if you follow this approach, the “simple” task is indeed simple, and the more complex tasks (like attaching binary objects or sending plain/HTML multipart messages) are accomplished … Read more
If you have access to the code that creates the canvas – simply call the function right there after the canvas is created. If you have no access to that code (eg. If it is a 3rd party code such as google maps) then what you could do is test for the existence in an … Read more
No, JavaScript is not a statically typed language. Sometimes you may need to manually check types of parameters in your function body.
lambda is an anonymous function, it is equivalent to: def func(p): return p.totalScore Now max becomes: max(players, key=func) But as def statements are compound statements they can’t be used where an expression is required, that’s why sometimes lambda‘s are used. Note that lambda is equivalent to what you’d put in a return statement of a … Read more
A function returns a value and a procedure just executes commands. The name function comes from math. It is used to calculate a value based on input. A procedure is a set of commands which can be executed in order. In most programming languages, even functions can have a set of commands. Hence the difference … Read more
For modern Javascript or Typescript: class Foo { reallyCoolMethodISwear(…args) { return args.length; } } function reallyCoolFunction(i, …args) { return args[i]; } const allHailTheLambda = (…args) => { return args.constructor == Array; }; const x = new Foo().reallyCoolMethodISwear(0, 1, 2, 3, 4); const y = reallyCoolFunction(3, 0, 1, 2, 3, 4, 5, 6); const z = … Read more
The accurate way is to use the __FUNCTION__ predefined magic constant. Example: class Test { function MethodA(){ echo __FUNCTION__; } } Result: MethodA.