func! } };CONSIDER "TEMPLATE METHOD" Recall the template method pattern (Design Patterns, Gamma/Helm/Johnson/Vlissides pp 325-330) struct Base { auto TemplateMethod() { PrimitiveOperation1(); ... }; };TEMPLATE METHOD WITH P0847 Recall the template method pattern (Design Patterns, Gamma/Helm/Johnson/Vlissides pp 325-330) Notice: this is morally equivalent to CRTP. template

66templateCharT, std::size_t N> struct basic_fixed_string { CharT data_[N + 1] = {}; // has to be public to be a structural type using iterator = CharT*; using const_iterator = const CharT*; constexpr basic_fixed_string(CharT ch) noexcept; constexpr basic_fixed_string(const CharT (&txt)[N + 1]) noexcept; [[nodiscard]] constexpr std::size_t size() const noexcept; [[nodiscard]] constexpr const CharT* c_str() c_str() const noexcept; [[nodiscard]] constexpr const CharT& operator[](std::size_t index) const noexcept; [[nodiscard]] constexpr CharT operator[](std::size_t index) noexcept; [[nodiscard]] constexpr

, String splitting. 8 Performance benefits9 namespace std { template CharT, class Traits = std::char_traits<CharT>> class basic_string_view; } It is present in header There are basic_string_view& other) noexcept = default; constexpr basic_string_view(const CharT* s, size_type count); constexpr basic_string_view(const CharT* s); No move constructor, so what happens when someone uses std::move string_view sv(s); string has a conversion operator to string_view. operator std::basic_string_view<CharT, Traits>() const noexcept; 10 C++17 ConstructorsC++20 Constructors 11 template

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declared, or are deleted. 22Howard Hinnant’s Special Members chart 23Howard Hinnant’s Special Members chart 24Howard Hinnant’s Special Members chart 25Copyright © 2023 Andre Kostur ● Copy } std::unique_ptr data_; }; 30Howard Hinnant’s Special Members chart 31Howard Hinnant’s Special Members chart 32Copyright © 2023 Andre Kostur Simple String - Second RAII cp) : data_(cp) { } std::string data_; }; 38Howard Hinnant’s Special Members chart 39Howard Hinnant’s Special Members chart 40Copyright © 2023 Andre Kostur Code isn’t just for the

st); templatecharT, class traits> basic_ostream<charT, traits>& operator<<(basic_ostream<charT, traits>& os, const stacktrace_entry& f); templatecharT, class traits, class Alloc> Alloc> basic_ostream<charT, traits>& operator<<(basic_ostream<charT, traits>& os, const basic_stacktrace& st); description() source_file() source_line()2021 Victor Ciura

Projects: Code reviews, C++20 features, etc. • Wiki: Changelog, checklists, other resources • Status Chart: Generated via GitHub's GraphQL API 28Code: github.com/microsoft/STL • Product: stl/inc, stl/src 34Status Chart: Monthly Merged PRs 35Year 1 ends. Year 2 begins! 36More Info • Links • Repository: github.com/microsoft/STL • Changelog: github.com/microsoft/STL/wiki/Changelog • Status Chart: microsoft contributors • Custom Autolinks • DevCom-724444, LLVM-41915, LWG-3080, WG21-P1209 43Status Chart 44Status Chart: Pull Request Age 45

Projects: Code reviews, C++20 features, etc. • Wiki: Changelog, checklists, other resources • Status Chart: Generated via GitHub's GraphQL API29 Code: github.com/microsoft/STL • Product: stl/inc, stl/src Status Chart: Monthly Merged PRs36 Year 1 ends. Year 2 begins!37 More Info • Links • Repository: github.com/microsoft/STL • Changelog: github.com/microsoft/STL/wiki/Changelog • Status Chart: microsoft contributors • Custom Autolinks • DevCom-724444, LLVM-41915, LWG-3080, WG21-P120944 Status Chart45 Status Chart: Pull Request Age

10/26/21 Pablo Halpern, 2021 (CC BY 4.0) 38 template CharT, std::size_t N> struct StrLiteralProxy { constexpr StrLiteralProxy(const CharT (&s)[N]) { std::copy(std::begin(s), std::end(s), std::begin(m_data)); std::begin(m_data)); } constexpr std::size_t size() const { return N - 1; } constexpr const CharT* data() const { return m_data; } CharT m_data[N]; }; StrLiteralProxy x = "hello"; // Deduced as StrLiteralProxy

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oating_point; template CharT, typename Traits, typename T, typename Validator> std::basic_ostream<CharT, Traits>& operator<<(std::basic_ostream<CharT, Traits>& os, const validated_type

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wchar_t: • Windows, sizeof(wchar_t) == 2 • Non-Windows, sizeof(wchar_t) == 4 std::basic_string<CharT> has memory implications. More on that later.What assumptions are being made? void get_size(size_t