Topic 16. C++ modules, organizing multi-file projects, and new features of the C++26 standard

Goal: learn to separate the interface and the implementation of a library; build named modules, static libraries, and independent clients; automate builds and checks; and determine which features the installed compiler supports.

Lecture contents

1. Multi-file projects and the ODR — From one program to a project · Example 1. A geometry library with a header · The one definition rule and linkage · Namespaces and the library interface
2. Libraries and modules — Static and dynamic libraries · C++20 named modules · The standard library as a module
3. CMake and C++26 — CMake and a reproducible build description · C++26: a language feature and its availability in an implementation · Organizing a training repository · Common mistakes

Practice and review

• Practice — 3 worked examples with full code and output
• Tasks — 30 variants, each with tasks at three difficulty levels
• Summary — conclusions, self-check questions, and useful links