Constructor Overloading

Constructor overloading means having multiple constructors in the same class with different parameter lists. This allows objects to be created in different ways depending on the provided arguments.

Overloading provides flexibility in initializing objects with varying amounts of data.

Here's a class with multiple constructors for different scenarios. It uses delegating constructors and initializer lists to avoid duplicate initialization logic, and marks the single-parameter constructor explicit to prevent unintended implicit conversions.

Initializer lists directly initialize members and are required for const data members and references. They are also typically more efficient than assignment in the constructor body.

Important: actual initialization order is the order of member declaration in the class, not the order listed in the initializer list.

Use one constructor as the single point of initialization and have other constructors delegate to it. This removes duplicated setup logic and keeps invariants centralized.

Default arguments can reduce the number of overloads, but be cautious: they can create ambiguities with other constructors.