Analysis of Copy Constructors in C++ Programming Language: Mechanisms, Common Application Errors, Comparisons with Equivalents in Java and Python Programming Languages
Analysis of Copy Constructors in C++ Programming Language:
Mechanisms, Common Application Errors, Comparisons with Equivalents
in Java and Python Programming Languages
Ohanyan Heghine,
Kyureghyan Armenuhi
Summary
Key words: move semantics, memory leak, RAII mechanism, shallow copy, deep copy, external resources, the “Rule of Five”
This article provides an analysis of the copy constructor in the C++ programming language as one of the fundamental mechanisms for resource management, object lifetime control, and dynamic memory handling. The discussion addresses the “Rule of Three” and the “Rule of Five,” their relationship to the RAII idiom, and their importance in preventing errors such as memory leaks, double resource deallocation, incorrect pointer copying, and violations of class invariants. Particular attention is paid to common misconceptions and typical mistakes in the design and implementation of copy constructors, as well as to the impact of shallow and deep copying on performance, stability, and program predictability. A comparative analysis of copy mechanisms in C++, Java, and Python is presented, highlighting the differences between deterministic resource management and automated garbage collection-based models. The article includes code examples and extended tables that illustrate optimal copying strategies, move semantics, and interactions with user-defined types. It concludes that a thorough understanding of the principles underlying the implementation of special member functions (constructors, copy and move assignment operators) is an essential prerequisite for the development of safe, efficient, and scalable software systems, particularly in high-performance and resource-intensive applications.
DOI: https://doi.org/10.58726/27382923-2025.2-72