Ace Your C++ Skills 2025 – Rock the ‘Thinking in C++’ Challenge!

Question: 1 / 565

How can a class ensure it only has one instance?

By making its constructor private

Using the 'singleton' pattern with a static member of the same class type

The 'singleton' pattern is a design pattern that ensures a class only has one instance while also providing a global point of access to that instance. Option A is incorrect because making the constructor private doesn't prevent multiple instances from being created, it just prevents outside classes from creating instances. Option C is incorrect because declaring all methods as static doesn't prevent multiple instances from being created without the use of the 'singleton' pattern. Option D is incorrect because making the class abstract doesn't ensure only one instance can be created.

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Declaring all its methods as static

By making the class abstract

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