Pure C++20 Mastery: Concepts, Ranges, Coroutines & Modules

A focused deep dive into C++20 language and library features for modern C++ developers

Pure C++20 Mastery is a comprehensive, standards-focused deep dive into the C++20 language and standard library.

Unlike most courses that combine older C++ standards with a brief C++20 overview, this course is entirely dedicated to C++20 — covering core language features, new library utilities, concurrency primitives, and the programming models introduced in this standard.

This course assumes some familiarity with modern C++ (C++11/14/17).
It does not repeat language fundamentals, object-oriented basics, or pre-C++20 material.

Core C++20 language features

You will learn all major C++20 language additions, including:

• consteval and constinit

• Designated initializers

• Lambda improvements, including usage in unevaluated contexts

• Modern enum enhancements

• The three-way comparison operator (<=>) and defaulted comparisons

These features are explained in terms of design intent, correct usage, and real-world implications.

Modules — a new compilation and reuse model

C++20 introduces modules, fundamentally changing how C++ code is structured and reused.

This course covers:

• Why modules were introduced

• How they differ from header-based designs

• How to define, export, and import modules

• Build-time, dependency, and architectural implications

• Practical limitations and current tooling realities

Ranges — algorithms redesigned

C++20 ranges are not just syntactic sugar.

You’ll gain a deep understanding of the ranges model, including:

• Views and lazy evaluation

• Range adaptors and composition

• Eliminating iterator boilerplate (begin() / end())

• Writing safer, more expressive algorithm pipelines

• Performance and correctness considerations

Concepts — constraints done right

Concepts introduce a clean, expressive way to constrain templates.

You’ll learn:

• Why concepts replace many SFINAE patterns

• Concepts vs enable_if

• Writing meaningful constraints

• Improving compile-time diagnostics

• Designing robust generic interfaces

Coroutines — resumable functions and cooperative concurrency

C++20 coroutines introduce a new execution model based on suspendable and resumable functions.

This course explains:

• Coroutine mechanics and execution flow

• Promise types, awaitables, and suspension points

• How coroutines enable asynchronous and cooperative concurrency

• How coroutines relate to threads and executors

• When coroutines are appropriate — and when they are not

C++20 concurrency & synchronization utilities

In addition to language features, this course provides in-depth coverage of new C++20 concurrency facilities, including:

• std::jthread and cooperative cancellation

• Stop tokens and structured thread lifetime management

• Modern synchronization primitives introduced or enhanced in C++20 such as latch, barrier & semaphore.

• Safer, more expressive concurrency patterns enabled by the new library design

This section focuses on why these utilities were added, how they improve correctness, and how they change modern C++ concurrency design.

New and updated C++20 library utilities

You will also explore important C++20 standard library additions, such as:

• Formatting facilities (std::format)

• New utility types and helper classes such as std::osyncstream, std::source_location, std::span, etc.

• Library changes that complement ranges, concepts, and coroutines

• Practical usage patterns and limitations

These topics are often skipped or briefly mentioned in other courses — here they are treated as first-class C++20 features.

• Update [12-Dec-2024] Added content on new C++20 library features & classes

• Update [07-Dec-2024] Added concurrency support videos

• Update [26-Nov-2024] Added quiz for all sections

• Update [09-Nov-2024] Added more videos with examples of views in Ranges section