A Tour of C++ for experienced programmers, as if C++26 is the only version that ever existed.

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Alexis Dumas · Humanizer pass: prose quality across all chapters + std::println normalization + value-categories table + ch03 code extraction · 1mo ago

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Appendix A: features and compilers #

This appendix lists the C++ features the book uses. It shows the proposal that introduced or significantly changed each feature. It also shows the compiler support in the pinned toolchain (Clang 22.1.8, libc++). The required flag or header is listed. Finally it indicates whether the book compiles an example or marks it as a gap.

Compiled means the book ships a real example that builds and runs. Gap means the feature is taught prose-first and registered so it builds only with BOOK_ENABLE_GAPS=ON. A "Not yet deployable" callout names the supporting compiler if any.

Feature	Proposal	Clang 22.1.8	Flag / header	Status
`std::format` / `std::print` / `std::println`	P0645, P2093	Yes	`<format>`, `<print>`, `-std=c++26`	Compiled
`std::mdspan`	P0009	Yes	`<mdspan>`	Compiled
`std::numbers` constants	P0631	Yes	`<numbers>`	Compiled
Concepts	P0734	Yes	`-std=c++20`+	Compiled
`consteval`, `constinit`, `is_constant_evaluated`	P1073, P1143, P0595	Yes	`-std=c++20`+	Compiled
Transient `constexpr` allocation	P0784	Yes	`-std=c++20`+	Compiled
Class-type NTTPs	P0732	Yes	`-std=c++20`+	Compiled
User-defined literals	C++11	Yes	`-std=c++20`+	Compiled
`std::generator`	P2502	Yes	`<generator>`	Compiled
`std::jthread` / stop tokens	P0660	Yes	`<thread>`, `<stop_token>`	Compiled
`std::atomic_ref`	P0019	Yes	`<atomic>`	Compiled
`std::scoped_lock`	P0156	Yes	`<mutex>`	Compiled
`std::ranges` / views	P0896, P2325	Yes	`<ranges>`, `<algorithm>`	Compiled
`std::execution::par`	P0024	No	`<execution>`	Prose only
Contracts (`[[assert]]`, `[[expects]]`, `[[ensures]]`)	P2900	No (GCC 16)	`-fcontracts`	Gap
`std::execution` (P2300 senders)	P2300	No	`<execution>`	Gap
`std::linalg`	P1673	No	`<linalg>`	Gap
Static reflection	P2996	No (GCC 16 partial)	`<experimental/meta>`	Gap
`<hazard_pointer>` / `<rcu>`	P2530, P2546	No	`<hazard_pointer>`, `<rcu>`	Gap
Modules (`import`, `export module`)	P1103	Partial	`-std=c++26`, BMI	Gap
Lifetime-safety analysis	P1179	Experimental	`-Xclang -fexperimental-lifetime-safety`	Compiled (demos)

The Nix dev shell in flake.nix provides the pinned toolchain. The book compiles only verified examples. Newer features are taught with exact syntax and an honest callout.