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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-c-core-guidelines-index"><a class="header" href="#appendix-c-core-guidelines-index">Appendix C: Core Guidelines index</a></h1><p>This appendix lists the C++ Core Guidelines rules referenced in the book, grouped by the chapter that teaches each rule. Rule IDs correspond to the CppCoreGuidelines version used during writing. When a rule appears in the text, its identifier is shown as (CG <id>) for easy lookup.</id></p><h2 id="chapter-2-values-and-functions"><a class="header" href="#chapter-2-values-and-functions">Chapter 2: values and functions</a></h2><ul><li>F.15: prefer simple and conventional ways of passing information.</li><li>F.20: for out-parameters, prefer return values over out-parameters.</li><li>F.21: to return multiple values, prefer returning a struct or tuple.</li><li>ES.25: declare an object const or constexpr unless you need to change its value.</li></ul><h2 id="chapter-3-user-defined-types"><a class="header" href="#chapter-3-user-defined-types">Chapter 3: user-defined types</a></h2><ul><li>C.20: if you can avoid defining default operations, do.</li><li>C.2: use class if the class has an invariant.</li><li>C.2: use struct if the data members can vary independently.</li></ul><h2 id="chapter-4-control-flow"><a class="header" href="#chapter-4-control-flow">Chapter 4: control flow</a></h2><ul><li>ES.28: use lambdas for complex initialization, especially of const variables.</li><li>ES.70: prefer a range-for-statement or a standard-library algorithm over a hand-written loop.</li></ul><h2 id="chapter-5-ownership-move-and-raii"><a class="header" href="#chapter-5-ownership-move-and-raii">Chapter 5: ownership, move, and RAII</a></h2><ul><li>R.1: manage resources automatically using RAII.</li><li>R.3: a raw pointer or reference is never a resource owner.</li><li>R.10-R.11: avoid calling <code>new</code> and <code>delete</code> explicitly.</li></ul><h2 id="chapter-6-smart-pointers"><a class="header" href="#chapter-6-smart-pointers">Chapter 6: smart pointers</a></h2><ul><li>R.20: use <code>unique_ptr</code> or <code>shared_ptr</code> to represent ownership.</li><li>R.22: use <code>shared_ptr</code> only to share ownership.</li></ul><h2 id="chapter-7-lifetimes"><a class="header" href="#chapter-7-lifetimes">Chapter 7: lifetimes</a></h2><ul><li>Lifetime profile: never dereference a possibly-invalid pointer or iterator.</li><li>Lifetime profile: a pointer or reference to a local must not escape.</li></ul><h2 id="chapter-8-argument-passing"><a class="header" href="#chapter-8-argument-passing">Chapter 8: argument passing</a></h2><ul><li>F.15: prefer simple and conventional ways of passing information.</li><li>F.20: for out-parameters, prefer return values over out-parameters.</li><li>F.21: to return multiple values, prefer returning a struct or tuple.</li><li>F.16-F.17: pass by value for small/cheap-to-move, <code>const T&</code> for big inputs.</li></ul><h2 id="chapter-9-errors-and-contracts"><a class="header" href="#chapter-9-errors-and-contracts">Chapter 9: errors and contracts</a></h2><ul><li>E.1-E.16: error-handling rules, including throw when the function cannot do its job, and prefer <code>std::expected</code> for anticipated absence.</li><li>E.25: a function that cannot throw must be declared <code>noexcept</code>.</li></ul><h2 id="chapter-11-containers"><a class="header" href="#chapter-11-containers">Chapter 11: containers</a></h2><ul><li>SL.con: standard-library container rules.</li><li>SL.con: prefer <code>std::vector</code> by default.</li></ul><h2 id="chapter-12-algorithms"><a class="header" href="#chapter-12-algorithms">Chapter 12: algorithms</a></h2><ul><li>ES.70: prefer a range-for-statement or a standard-library algorithm over a hand-written loop.</li></ul><h2 id="chapter-14-callables-and-type-erasure"><a class="header" href="#chapter-14-callables-and-type-erasure">Chapter 14: callables and type erasure</a></h2><ul><li>F.51-F.52: prefer a lambda or a function object for small callables.</li><li>F.51-F.52: prefer a regular function for a stateless callable.</li></ul><h2 id="chapter-16-17-templates-and-concepts"><a class="header" href="#chapter-16-17-templates-and-concepts">Chapter 16-17: templates and concepts</a></h2><ul><li>T.1-T.65: template and generic-programming rules.</li><li>T.1-T.65: define concepts to express template constraints (T.10).</li></ul><h2 id="chapter-21-reading-legacy-tmp"><a class="header" href="#chapter-21-reading-legacy-tmp">Chapter 21: reading legacy TMP</a></h2><ul><li>The rules for reading, not writing: write concepts, read SFINAE (T.1, T.10).</li></ul><h2 id="chapters-25-26-concurrency"><a class="header" href="#chapters-25-26-concurrency">Chapters 25-26: concurrency</a></h2><ul><li>CP.1-CP.8: concurrency rules.</li><li>CP.1-CP.8: protect shared mutable state with a mutex or an atomic.</li><li>CP.1-CP.8: never access a non-atomic shared object without synchronization.</li></ul><h2 id="chapter-29-fast-is-a-specification"><a class="header" href="#chapter-29-fast-is-a-specification">Chapter 29: fast is a specification</a></h2><ul><li>Perf.1-Perf.11: performance rules.</li><li>Perf.1-Perf.11: measure before optimizing (Perf.1).</li><li>Perf.1-Perf.11: avoid cheap micro-optimizations that do not show up in measurement.</li></ul><p>This index is not exhaustive. The chapters cite the exact rule at the point of use. The intent of the book is that every rule it teaches is attributed, so a reader can chase the source of any guideline.</p>
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