const& c) { } 1 2 auto rects = tc::make_vector(tc::transform(c, 3 [](widget const& w) { return w.bounding_box(); } 4 )); 5 // Magic happens 6 tc::for_each(tc::zip(c, rects), 7 [&](widget& const& c) { } 1 2 auto rects = tc::make_vector(tc::transform(c, 3 [](widget const& w) { return w.bounding_box(); } 4 )); 5 // Magic happens 6 tc::for_each(tc::zip(c, rects), 7 [&](widget& [&](widget& w, rect r) { 8 widget.place(r); 9 } 10 11 ); 12 auto rects = tc::make_vector(tc::transform(c, [](widget const& w) { return w.bounding_box(); } )); // https://github.com/think-cell/think-cell-library

Cordell Jonathan Müller — @foonathan Express your expectations CppCon 2023-10-03 1tc::json::parser Extract some JSON members tc nlohmann RapidJSON Boost.JSON simdjson 0 10 20 30 40 Library Time in ms stdv::filter([](int i) { return i % 2 == 0; }) | stdv::transform([](int i) { return i * i; }); return tc::find_first_if<tc::return_value_or_none>(even_squares, [](int square) { return square % 3 == 0; }); } Jonathan struct tc::json::parser { … }; Jonathan Müller — @foonathan Express your expectations CppCon 2023-10-03 52Pulling primitive values template struct tc::json::parser

layout(self): cmake_layout(self) def generate(self): deps = CMakeDeps(self) deps.generate() tc = CMakeToolchain(self) tc.generate() def build(self): cmake = CMake(self) cmake.configure() cmake.build() def "Windows": del self.options.fPIC def layout(self): cmake_layout(self) def generate(self): tc = CMakeToolchain(self) tc.generate() def build(self): cmake = CMake(self) cmake.configure() cmake.build() def with_fmt: self.requires("fmt/8.1.1") def generate(self): tc = CMakeToolchain(self) if self.options.with_fmt: tc.variables["WITH_FMT"] = True tc.generate() ... As you can see: • We declare a new with_fmt

layout(self): cmake_layout(self) def generate(self): deps = CMakeDeps(self) deps.generate() tc = CMakeToolchain(self) tc.generate() def build(self): cmake = CMake(self) cmake.configure() cmake.build() def "Windows": del self.options.fPIC def layout(self): cmake_layout(self) def generate(self): tc = CMakeToolchain(self) tc.generate() def build(self): cmake = CMake(self) cmake.configure() cmake.build() def with_fmt: self.requires("fmt/8.1.1") def generate(self): tc = CMakeToolchain(self) if self.options.with_fmt: tc.variables["WITH_FMT"] = True tc.generate() ... As you can see: • We declare a new with_fmt

layout(self): cmake_layout(self) def generate(self): deps = CMakeDeps(self) deps.generate() tc = CMakeToolchain(self) tc.generate() def build(self): cmake = CMake(self) cmake.configure() cmake.build() def "Windows": del self.options.fPIC def layout(self): cmake_layout(self) def generate(self): tc = CMakeToolchain(self) tc.generate() def build(self): cmake = CMake(self) cmake.configure() cmake.build() def with_fmt: self.requires("fmt/8.1.1") def generate(self): tc = CMakeToolchain(self) if self.options.with_fmt: tc.variables["WITH_FMT"] = True tc.generate() ... As you can see: • We declare a new with_fmt

layout(self): cmake_layout(self) def generate(self): deps = CMakeDeps(self) deps.generate() tc = CMakeToolchain(self) tc.generate() def build(self): cmake = CMake(self) cmake.configure() cmake.build() def "Windows": del self.options.fPIC def layout(self): cmake_layout(self) def generate(self): tc = CMakeToolchain(self) tc.generate() def build(self): cmake = CMake(self) cmake.configure() cmake.build() def with_fmt: self.requires("fmt/8.1.1") def generate(self): tc = CMakeToolchain(self) if self.options.with_fmt: tc.variables["WITH_FMT"] = True tc.generate() ... As you can see: • We declare a new with_fmt

layout(self): cmake_layout(self) def generate(self): deps = CMakeDeps(self) deps.generate() tc = CMakeToolchain(self) tc.generate() def build(self): cmake = CMake(self) cmake.configure() cmake.build() def "Windows": del self.options.fPIC def layout(self): cmake_layout(self) def generate(self): tc = CMakeToolchain(self) tc.generate() def build(self): cmake = CMake(self) cmake.configure() cmake.build() def with_fmt: self.requires("fmt/8.1.1") def generate(self): tc = CMakeToolchain(self) if self.options.with_fmt: tc.variables["WITH_FMT"] = True tc.generate() ... As you can see: • We declare a new with_fmt

Can’t we just synthesize std::tuple_element from get? CppCon 2024-09-18 9Problem 4: Tuple transform tc::transform(tpl, f) my_tuple_element instantiates f twice f might not work on const f might react get(std::declval<tc::temporary>()) ); static constexpr auto stores_reference = !tc::is_temporary; using type = std::conditional_t< stores_reference, type_temporary, tc::remove_t get(std::declval<tc::temporary>()) ); static constexpr auto stores_reference = !tc::is_temporary; using type = std::conditional_t< stores_reference, type_temporary, tc::remove_t