Contents
Can we create constructor outside the class?
You can not declare a constructor outside of a class but you can define it outside of a class. A member function may be defined (8.4) in its class definition, in which case it is an inline member function (7.1.
Can we use void with constructor?
Constructor is not like any ordinary method or function, it has no return type, thus it does not return void.
Can you use this in a constructor?
“this” keyword can be used inside the constructor to call another overloaded constructor in the same class. Then “this” keyword can call the constructor with an argument from the constructor without argument. This is required as the constructor cannot be called explicitly.
Why constructor has no return type?
So the reason the constructor doesn’t return a value is because it’s not called directly by your code, it’s called by the memory allocation and object initialization code in the runtime. Its return value (if it actually has one when compiled down to machine code) is opaque to the user – therefore, you can’t specify it.
Can a constructor be declared outside of a class?
You can not declare a constructor outside of a class but you can define it outside of a class. A member function may be defined (8.4) in its class definition, in which case it is an inline member function (7.1.2), or it may be defined outside of its class definition if it has already been declared but not defined in its class definition.
Where do I put the constructor definition in C + +?
Usually this means you put the class definition in a header file, to be included by client code, and the constructor definition (as well as other class member function definitions) in an implementation file that gets compiled. This way, users of your code have no compile time dependency on said definitions.
What happens when I call a constructor from another constructor?
When calling a constructor it actually allocates memory, either from the stack or from the heap. So calling a constructor in another constructor creates a local copy. So we are modifying another object, not the one we are focusing on.
Can a class have no default constructor in C + +?
If any non-default constructors are declared, the compiler does not provide a default constructor: If a class has no default constructor, an array of objects of that class cannot be constructed by using square-bracket syntax alone. For example, given the previous code block, an array of Boxes cannot be declared like this: