To create a private and specialized custom copy constructor in C++, follow these steps:
Declare the class with a private constructor and copy-constructor.
Declare the copy-constructor as private.
Overload the new operator with a private function that creates a new instance of the class using the copy-constructor.
Define a friend class or function that is allowed to call the private copy constructor.
Here's an example:
class Foo {
private:
Foo() {}
Foo(const Foo& other) {} // Private copy constructor
public:
static Foo createCopy(const Foo& other) { // Private overload of new operator
return Foo(other);
}
friend class Bar; // Friend class that can call the private copy constructor
};
class Bar {
public:
void doSomething(const Foo& foo) {
Foo newFoo = Foo::createCopy(foo); // Calls private copy constructor
// Do something with newFoo
}
};
In this example, the Foo
class has a private constructor and copy constructor. The createCopy
function overloads the new operator and creates a new instance of Foo
using the copy constructor. The Bar
class is a friend of Foo
and can call the private copy constructor through the createCopy
function.
Asked: 2021-07-25 11:00:00 +0000
Seen: 9 times
Last updated: Oct 21 '21