You can “capture” the i when creating the lambda lambda x, i=i: x%i==0 This will set the i in the lambda’s context equal to whatever i was when it was created. you could also say lambda x, n=i: x%n==0 if you wanted. It’s not exactly capture, but it gets you what you need. It’s an … Read more
One can access the current event through window.event. Just using event is implicitly accessing window.event.
When you declare a friend function with an unqualified id in a class it names a function in the nearest enclosing namespace scope. If that function hasn’t previously been declared then the friend declaration doesn’t make that function visible in that scope for normal lookup. It does make the declared function visible to argument-dependent lookup. … Read more
Python does not have block scope. Anything defined inside the try block will be available outside. That said, you would still have a problem: if it is the getConnection() call that raises the error, cursor will be undefined, so the reference in the finally block will error.
This happens because you are using immutable values (ints and None), and importing variables is like passing things by value, not passing things by reference. If you made global_mod.x a list, and manipulated its first element, it would work as you expect. When you do from global_mod import x, you are creating a name x … Read more
You need to capture the this pointer: this->cv.wait(lk, [this]{return ready;});
First, remember that objects in C++ can be created either on the stack or on on the heap. A stack frame (or scope) is defined by a statement. That can be as big as a function or as small as a flow control block (while/if/for etc.). An arbitrary {} pair enclosing an arbitrary block of … Read more
Use a QML Singleton. Please reference “Approach 2” on this page — The ugly QTBUG-34418 comments are mine. These are the pieces you need: Style.qml pragma Singleton import QtQuick 2.0 QtObject { property color mainbg: ‘red’ } qmldir This file must be in the same folder as the singleton .qml file (Style.qml in our example) … Read more
When you have methods or statements outside of a class declaration in a groovy script, an implicit class is created. To answer your questions: In your example, func() can access the field c because they are both members of the implicit class. The Main class is not, so it can’t. You need to pass a … Read more
The only way to truly get access to function a‘s private scope is to declare b inside of a so it forms a closure that allows implicit access to a‘s variables. Here are some options for you. Direct Access Declare b inside of a. function a() { var x = 5, obj = {}; function … Read more