Mastering C++: A Comprehensive Quiz Based on 'Thinking in C++'

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Test your C++ skills with our quiz based on Bruce Eckel's 'Thinking in C++'. Dive into object-oriented programming, advanced topics, and fundamentals. Perfect for learners and experts alike. Assess your knowledge and become a C++ master!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.

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
Declaring all its methods as static
By making the class abstract

The correct answer is: 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.