requires clause Requirements with requires expression Concept (named requirements) // OK, uses 1st add() calling push_back() // OK, uses 2nd add() calling insert() Nico Josuttis C++ Concepts @cppcon coll.insert(val); } std::vector coll1; std::set coll2; add(coll1, 42); // OK, uses 1st add() calling push_back() add(coll2, 42); // OK, uses 2nd add() calling insert() C++20 C++20 add() calling insert() 2nd add() is used, because concept for 1st add() not satisfied Requirements not met => Concept not satisfied => 1st add() ignored Nico Josuttis C++ Concepts @cppcon 2024-09-18

public lockable_item { static constexpr size_t buf_size = 32; char ma_chars[buf_size]; void st_update(FILE* fp, prn_gen& gen, int_dist& char_dist); void tx_update(transaction const& tx, FILE* Strategy for Containers Testing – test_item::st_update() //- Updates on-board data for the non-STO tests. Checks to see if a race has occurred. // void test_item::st_update(FILE* fp, prn_gen& gen, int_dist& Strategy for Containers Testing – test_item::st_update() //- Updates on-board data for the non-STO tests. Checks to see if a race has occurred. // void test_item::st_update(FILE* fp, prn_gen& gen, int_dist&

auto st = makeStringsLambda(); // ... return tree; } static constexpr auto MakeEncodedBitStream( CallableGivesIterableStringViews auto makeStringsLambda) { constexpr auto st = makeStringsLambda(); makeStringsLambda(); constexpr auto NumStrings = std::distance(st.begin(), st.end()); constexpr auto tree = BuildHuffmanTree(makeStringsLambda); ResultType stream; // { std::array result; std::size_t i{0}; for(auto const &s : st) { result.at(i) = CalculateStringLength(s); ++i; } return result; };

Introspection Measurement Code Code Generation/* Generated from Debug Info */ static types::st::Unit getSizeType( const Foo& t, typename TypeHandler::type returnArg) { return std::vector bar_vec; std::string foo_str; };template static types::st::Unit getSizeType( const std::vector& container, typename TypeHandler class std::vector {...}; CodeGen: containers/* Generated from Debug Info */ static types::st::Unit getSizeType( const Bar& t, typename TypeHandler::type returnArg) { return

names: =- When you need an object/value multiple times: std: :string strfgetData())} 7 J1 copy (st need the value of stz) col11.Push_ back (stz) J1 copy (but no longer need the value) col12.Push_back this value jere” =- When you need an object/value multiple times: string strfgetData()] 1 J1 copy (st need the value of stz) col11.Push_ back (stz) 1 J1 move (ok nolonger need the value) col12 .push_back(std: temporal Jsame, but doing something between compute() and process(): autogs val = compute(t); Process (st forward(val)) 7 ES josuttis | eckstein Ci

fundamental operation in graph algorithms 。 Given avertex岂find allthe neighbors of (all verticesv st. (WUV) E 古， ie st.edge (uv) is in the graph) 。Then foreach neighbor find its neighbors (and so on) G = {有了 g，std::ranges::range_value_t e) T { source(E，e) } -> std: :convertible_to>; { target(E，e) } -> st 了 : :convertible_to>; adjacency_jist 一”graph _ degree_enumerable edge jist Where Gaph ndieaaed aceightedmatching Venerhnd Edge st Gaph and ndigence Gaph ndieaaed indegree ordermg

I download prebuilt libraries from the Internet Conan vcpkg NuGet How do you manage your C++ 1st and 3rd party libraries?Most popular package managers for enterprises Conan For more on package its API version, a Diamond problem occurs •Very common with open-source, but also possible with 1st party libraries at large companies Library A version ? Library B version ? Library C version centralizing common dependency management tasks •Maintaining 3rd party packages and providing support for 1st party ones •Approving new open-source dependencies and validating compliance •Maintaining a common

SseVal()); // w^2, x^2, y^2, z^2 __m128 add1st = _mm_hadd_ps(squares, squares); // w^2+x^2, y^2+z^2, w^2+x^2, y^2+z^2 __m128 add2nd = _mm_hadd_ps(add1st, add1st); // w^2+x^2+y^2+z^2, ... float result =

4 while(k++ < 300) { 5 // CPU operations 6 co_await cuda.suspend_polling([=](cudaStream_t st) { 7 // GPU operations... 8 }); 9 } 10 } Assume each task is a data-driven task 77Experimental 3 cpu_busy_loop(ctime); 4 co_await _cuda.suspend_callback([=](cudaStream_t st) { 5 cuda_busy_loop<<<8, 256, 0, st>>>(gtime); // large overhead 6 }) 7 } Assume each task is a fixed-runtime task

concept's 1st argument is injected // by the compiler, as if we wrote: Printable template void print1(const T& t) { cout << t << endl; } // 2. concept on auto parameter: concept's 1st argument concept’s parameter is not injected and thus shall be manually provided: // examples where concept's 1st argument is not injected // and shall be provided explicitly: // [1] template requires