Core · Module 5 · Lesson 2 of 6
Constructors, Destructors and the Rule of Zero
Give every Contact a valid start with member-initializer lists, delegating constructors, and deleted operations, then let the Rule of Zero remove ownership work.
By the end you can
- Write a constructor with a member-initializer list that builds every member once
- Control default construction with defaulted, deleted, and delegating constructors
- Apply the Rule of Zero by storing a string instead of a raw buffer
Builds on Classes and Access Control: Building Your First Type.
01 · A question first
A teammate writes Contact c; and the program prints an empty name with age 927431. The compiler stayed silent, the tests passed, and the bad record reached the report. How do you make invalid contacts impossible to build while writing the validation logic only once?
Make a guess before you read on.
02 · The idea
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What's inside
- Why an empty contact should not compile
- How member initialization builds each member once
- One validation path through delegation
- Why the Rule of Zero removes ownership code
- What it costs and where teams slip
- Where it is used
03 · Practice
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