overview of what the poster reports on. Title: Pipeline architectures in C++: overloaded pipe operator | std::expected and its monadic operations Brief overview: Functional programming in C++ is the overloaded pipe operator. In this poster I show how to implement a custom pipeline framework that employs std::expected, available since C++23. An overloaded custom pipe operator | will be presented my book about C++ [1][3]. One of the topics was to describe the behavior of the overloaded pipe operator | in std::ranges. I came across Ankur's Satle lecture [4] and decided to expand on this topic –

Pablo Halpern, 2021 (CC BY 4.0) 10Minimizing the divide between builtin and user-defined types ■ Operator overloading allows the syntax for assigning, comparing, and streaming a std::string to be the same function auto room_temp = celsius(20.0);So, aren't UDLs just syntactic sugar? ■ You betcha! ■ So is operator overloading. ■ So are infix operators in general! – a+b is just syntactic sugar for plus(a, b) obfuscate, just as operator overloading can! 10/26/21 Pablo Halpern, 2021 (CC BY 4.0) 15DEFINING A UDL SUFFIX 10/26/21 Pablo Halpern, 2021 (CC BY 4.0) 16The UDL operator ■ operator""_udl defines a UDL

begin(); auto __end1 = __range1.end(); for(; operator!=(__begin1, __end1); __begin1.operator++()) { int const & v = __begin1.operator*(); cout.operator<<(v).operator<<(endl); } } { // for (const auto& v : begin(); auto __end1 = __range1.end(); for(; operator!=(__begin1, __end1); __begin1.operator++()) { int const & v = __begin1.operator*(); cout.operator<<(v).operator<<(endl); } } 1 2 3 4 5 6 7 8 9 10 11 begin(); auto __end1 = __range1.end(); for(; operator!=(__begin1, __end1); __begin1.operator++()) { int const & v = __begin1.operator*(); cout.operator<<(v).operator<<(endl); } } { // for (const auto& v :

noexcept = default; 8 constexpr extents(const extents &) noexcept = default; 9 constexpr extents& operator =( const extents &) noexcept = default; 10 11 template 12 constexpr , rank_dynamic () >&) noexcept; 17 template 18 constexpr extents& operator =( const extents < OtherExtents ... >&) noexcept; 19 20 // [mdspan.extents.obs], Observers of the &) noexcept; 10 11 constexpr mapping& operator =( const mapping &) noexcept = default; 12 template constexpr mapping& operator =( const mapping &) noexcept;

s } { if( w.pr ) pr = new Resource( *w.pr ); } // Copy assignment operator Widget& operator=( Widget const& w ) { } // … }; 1 2 3 4 5 6 7 8 9 10 11 12 13 s } { if( w.pr ) pr = new Resource( *w.pr ); } // Copy assignment operator Widget& operator=( Widget const& w ) { return *this; } // … }; 1 2 3 4 5 6 s } { if( w.pr ) pr = new Resource( *w.pr ); } // Copy assignment operator Widget& operator=( Widget const& w ) { i = w.i; return *this; } // … };

Transitivity ∀ a, b, c, if (a == b)==true and (b == c)==true => (a == c)==true The type must work with operator== and the result should have standard semantics.2023 Victor Ciura | @ciura_victor - Regular judgement”2023 Victor Ciura | @ciura_victor - Regular, Revisited 75 Slide Title Three-way comparison operator <=> 🛸 C++20 Bringing consistent comparison operations... (a <=> b) < 0 if a < b (a <=> b) equal/equivalent2023 Victor Ciura | @ciura_victor - Regular, Revisited 76 Slide Title Three-way comparison operator <=> 🛸 C++20 The comparison categories for: It's all about relation strength 🔥2023 Victor

current_outer); [[nodiscard]] reference operator*() const; inner_iterator& operator++(); [[nodiscard]] inner_iterator operator++(int) [[nodiscard]] bool operator==(inner_iterator const& rhs) const; current_outer); [[nodiscard]] reference operator*() const; inner_iterator& operator++(); [[nodiscard]] inner_iterator operator++(int) [[nodiscard]] bool operator==(inner_iterator const& rhs) const; [[nodiscard]] reference operator*() const; 16 inner_iterator& operator++(); 17 [[nodiscard]] inner_iterator operator++(int) 18 [[nodiscard]] bool operator==(inner_iterator const& rhs)

function return Another copy during assignment operator13 David Olsen — Back to Basics: Move Semantics — CppCon 2020 #include Assignment operator dictionary = build_dictionary(getCustomerDb()); “z” : “9”14 David Olsen — Back to Basics: Move Semantics — CppCon 2020 #include Assignment operator dictionary = build_dictionary(getCustomerDb()); Destroy old value Copy dictionary return value “z” : “9”15 David Olsen — Back to Basics: Move Semantics — CppCon 2020 #include Assignment operator dictionary = build_dictionary(getCustomerDb()); Destroy old value Copy dictionary return value

io/2017/11/17/understanding -operator-co-await • co_await is a unary operator(so in case the compiler can find the definition of operator function, it is valid) • awaitable - type supports co_await operator. • awaiter __sum4_resume(void* ptr) { // ... __sp1: frame->sum_a_b = sum(frame->params.a, frame->params.b).operator co_await(); if (!frame->sum_a_b.await_ready()) { frame->resumeIndex = 2; symmetricTransferTarget frame->sum_a_b.await_resume(); frame->sum_a_b.~(); frame->sum_c_d = sum(frame->params.c, frame->params.d).operator co_await(); if (!frame->sum_c_d.await_ready()) { frame->resumeIndex = 3; symmetricTransferTarget

identifiers comparable A naive strategy 1 template 2 constexpr bool operator <( symbol_id , symbol_id ) { 3 return symbol_id :: address < symbol_id :: std::less does not have this limitation 1 template 2 constexpr bool operator <( symbol_id , symbol_id ) { 3 return std :: less {}( symbol_id :: address , Binding Constraints Architecture Substitution Construction Conclusion Leveraging the spaceship operator Final code for comparison 1 template 2 struct symbol_id { 3 static constexpr auto singleton