When i is 1, it creates a new Point object again, calls normal constructor. You use this value to configure your notification hub. The syntax to do it is: Syntax: list list_name(size_of_list, value_to_be_inserted); Below programs show how to create a List with Constructor in C++. Why argument to a copy constructor must be passed as a reference? First of all, initialize the size of array five. Share this: - aikur.de You give it a prvalue as argument, yes, but what emplace_back accepts is a pack of forwarding references.A reference must refer to an object, so a temporary is materialized, and moved. call method from another class in Flutter(Dart The error is about the line which is given in the output, not the push_back itself. I have a class whose copy constructors are explicitly deleted (because A uses pointers internally and I don't want to fall into shallow copy pitfalls): class A {public: A (const A &) = delete; A & operator =(const A &) = delete; A (const B & b, const C & c);} Now I have a vector of type vector aVector; … Hence, the copy-constructor is called twice. The above will work if we use emplace_back(), but will fail with push_back() because the std::string(std::string_view) constuctor is explicit. The following program errors are related to the absence of a copy constructor. Copy Constructor - an overview | ScienceDirect Topics 4) When the compiler generates a temporary object. When is a Copy Constructor Called in C++? - GeeksforGeeks Copy constructor caused by push_back. this.myArray.push(['a' => 'b']); Unfortunately this does not work with Vue 3 as myArray appears to be wrapped in a proxy object. Wait, before push, vector points needs to resize (usually double the size), copy points [0] to new vector first, then push. C++ Programming Concepts - Why is Copy Constructor required?