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A Tour of C++ for experienced programmers, as if C++26 is the only version that ever existed.
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<h1 class="menu-title">A Tour of C++26</h1>
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<div id="mdbook-content" class="content"> <main> <h1 id="appendix-a-features-and-compilers"><a class="header" href="#appendix-a-features-and-compilers">Appendix A: features and compilers</a></h1><p>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.</p><p>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 <code>BOOK_ENABLE_GAPS=ON</code>. A “Not yet deployable” callout names the supporting compiler if any.</p><div class="table-wrapper"><table><thead><tr><th>Feature</th><th>Proposal</th><th>Clang 22.1.8</th><th>Flag / header</th><th>Status</th></tr></thead><tbody><tr><td><code>std::format</code> / <code>std::print</code> / <code>std::println</code></td><td>P0645, P2093</td><td>Yes</td><td><code><format></code>, <code><print></code>, <code>-std=c++26</code></td><td>Compiled</td></tr><tr><td><code>std::mdspan</code></td><td>P0009</td><td>Yes</td><td><code><mdspan></code></td><td>Compiled</td></tr><tr><td><code>std::numbers</code> constants</td><td>P0631</td><td>Yes</td><td><code><numbers></code></td><td>Compiled</td></tr><tr><td>Concepts</td><td>P0734</td><td>Yes</td><td><code>-std=c++20</code>+</td><td>Compiled</td></tr><tr><td><code>consteval</code>, <code>constinit</code>, <code>is_constant_evaluated</code></td><td>P1073, P1143, P0595</td><td>Yes</td><td><code>-std=c++20</code>+</td><td>Compiled</td></tr><tr><td>Transient <code>constexpr</code> allocation</td><td>P0784</td><td>Yes</td><td><code>-std=c++20</code>+</td><td>Compiled</td></tr><tr><td>Class-type NTTPs</td><td>P0732</td><td>Yes</td><td><code>-std=c++20</code>+</td><td>Compiled</td></tr><tr><td>User-defined literals</td><td>C++11</td><td>Yes</td><td><code>-std=c++20</code>+</td><td>Compiled</td></tr><tr><td><code>std::generator</code></td><td>P2502</td><td>Yes</td><td><code><generator></code></td><td>Compiled</td></tr><tr><td><code>std::jthread</code> / stop tokens</td><td>P0660</td><td>Yes</td><td><code><thread></code>, <code><stop_token></code></td><td>Compiled</td></tr><tr><td><code>std::atomic_ref</code></td><td>P0019</td><td>Yes</td><td><code><atomic></code></td><td>Compiled</td></tr><tr><td><code>std::scoped_lock</code></td><td>P0156</td><td>Yes</td><td><code><mutex></code></td><td>Compiled</td></tr><tr><td><code>std::ranges</code> / views</td><td>P0896, P2325</td><td>Yes</td><td><code><ranges></code>, <code><algorithm></code></td><td>Compiled</td></tr><tr><td><code>std::execution::par</code></td><td>P0024</td><td>No</td><td><code><execution></code></td><td>Prose only</td></tr><tr><td>Contracts (<code>[[assert]]</code>, <code>[[expects]]</code>, <code>[[ensures]]</code>)</td><td>P2900</td><td>No (GCC 16)</td><td><code>-fcontracts</code></td><td>Gap</td></tr><tr><td><code>std::execution</code> (P2300 senders)</td><td>P2300</td><td>No</td><td><code><execution></code></td><td>Gap</td></tr><tr><td><code>std::linalg</code></td><td>P1673</td><td>No</td><td><code><linalg></code></td><td>Gap</td></tr><tr><td>Static reflection</td><td>P2996</td><td>No (GCC 16 partial)</td><td><code><experimental/meta></code></td><td>Gap</td></tr><tr><td><code><hazard_pointer></code> / <code><rcu></code></td><td>P2530, P2546</td><td>No</td><td><code><hazard_pointer></code>, <code><rcu></code></td><td>Gap</td></tr><tr><td>Modules (<code>import</code>, <code>export module</code>)</td><td>P1103</td><td>Partial</td><td><code>-std=c++26</code>, BMI</td><td>Gap</td></tr><tr><td>Lifetime-safety analysis</td><td>P1179</td><td>Experimental</td><td><code>-Xclang -fexperimental-lifetime-safety</code></td><td>Compiled (demos)</td></tr></tbody></table></div><p>The Nix dev shell in <code>flake.nix</code> provides the pinned toolchain. The book compiles only verified examples. Newer features are taught with exact syntax and an honest callout.</p>
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