RobotHubCourse outline

C++ Intermediate · Lesson 03 of 8

Copy, move, rule of five

Value categories, move constructors, std::move pitfalls.

Estimated time · 6h

Guided lesson

Work through these steps

  1. 1.

    Read the copy, move, rule of five example and identify what each line owns or changes.

  2. 2.

    Create a small source file, compile with warnings enabled, and run it from the terminal.

  3. 3.

    Change one input, predict the result before running, then compare the output.

  4. 4.

    Record one compiler or runtime error and explain the correction in your own words.

Example

Try it yourself

class Frame {
public:
  Frame(Frame&&) noexcept = default;
  Frame& operator=(Frame&&) noexcept = default;
};

Practical exercise

Apply the lesson

Build a small robotics-flavoured program that demonstrates copy, move, rule of five. Keep the first version simple, compile with -Wall -Wextra, and test one normal and one edge case.

Before you continue

  • The program builds without warnings
  • You can explain the key rule without reading the example
  • The normal and edge cases both have recorded results