I’m trying to create a new object of type T via its constructor when adding to the list. I’m getting a compile error: The error message is: ‘T’: cannot provide arguments when creating an instance of a variable But my classes do have a constructor argument! How can I make this work? public static string … Read more
Has anyone here ever used C++’s “placement new”? If so, what for? It looks to me like it would only be useful on memory-mapped hardware. 25 s 25 Placement new allows you to construct an object in memory that’s already allocated. You may want to do this for optimization when you need to construct multiple … Read more
I see in C++ there are multiple ways to allocate and free data and I understand that when you call malloc you should call free and when you use the new operator you should pair with delete and it is a mistake to mix the two (e.g. Calling free() on something that was created with … Read more
I stumbled upon Stack Overflow question Memory leak with std::string when using std::list<std::string>, and one of the comments says this: Stop using new so much. I can’t see any reason you used new anywhere you did. You can create objects by value in C++ and it’s one of the huge advantages to using the language. … Read more
If ‘Test’ is an ordinary class, is there any difference between: Test* test = new Test; and Test* test = new Test(); 7 s 7 Let’s get pedantic, because there are differences that can actually affect your code’s behavior. Much of the following is taken from comments made to an “Old New Thing” article. Sometimes … Read more
The new keyword in JavaScript can be quite confusing when it is first encountered, as people tend to think that JavaScript is not an object-oriented programming language. What is it? What problems does it solve? When is it appropriate and when not? 1 16 It does 5 things: It creates a new object. The type … Read more