a copy - Object likely destroyed before kernel completes - We need a copy constructible placeholder object __global__ void kernel(BCL::cuda::HashMap map) { size_t tid = ...; size_t a copy - Object likely destroyed before kernel completes - We need a copy constructible placeholder object __global__ void kernel(BCL::cuda::HashMap map) { size_t tid = ...; size_t a copy - Object likely destroyed before kernel completes - We need a copy constructible placeholder object __global__ void kernel(BCL::cuda::HashMap map) { size_t tid = ...; size_t

can take any number of parameters. 1 Type generic_function(std::span); What should this placeholder Type be? 12 . 11Copyright Jason Turner @le�icus emptycrate.com/idocpp A Generic Function Signature can take any number of parameters. 1 Type generic_function(std::span); What should this placeholder Type be? It needs to be able to hold all of the types we care about plus one other thing… 12 can take any number of parameters. 1 Type generic_function(std::span); What should this placeholder Type be? It needs to be able to hold all of the types we care about plus one other thing… void

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 std::bind and std::placeholder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 3.3 rvalue Reference . . . . Passing with a specific literal, can the compiler assist us in type derivation, By using the placeholder auto, there is no longer a need to explicitly specify the type? Fortunately, C++17 introduces std::cout << func(10) << std::endl; std::cout << func2(10) << std::endl; } std::bind and std::placeholder And std::bind is used to bind the parameters of the function call. It solves the requirement that

parameters. 2. Using requires clause after the template parameter list. 3. Using concept on the placeholder type in an abbreviated function template declaration. 4. Using trailing requires clause. 33 with T } 4. Using requires clause after the template parameter list. 3. Using concept on the placeholder type in an abbreviated function template declaration. * Remember this list, we will go back to

auto s = std::string(p, to); ... } 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 15.1P2169 A nice placeholder with no name // before //after std::lock_guard namingIsHard(mutex); binding 3 [[maybe_unused]] auto [x, y, iDontCare] = f(); auto [x, y, _] = f(); 4 16P2169 A nice placeholder with no name // before //after std::lock_guard namingIsHard(mutex);

T> concept Bellicose = requires(T &a, Damageable auto &b) { a.hit(b); }; «Error: placeholder type not allowed in that context» or «auto not allowed in requires expression parameter» 92Clarifying T> concept Bellicose = requires(T &a, Damageable auto &b) { a.hit(b); }; «Error: placeholder type not allowed in that context» or «auto not allowed in requires expression parameter» I

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 std::bind 和 std::placeholder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 3.3 右值引用 . . . . . . . . . std::cout << func(10) << std::endl; std::cout << func2(10) << std::endl; } std::bind 和 std::placeholder 而 std::bind 则是用来绑定函数调用的参数的，它解决的需求是我们有时候可能并不一定能够一次 性获得调用某个函数的全部参数，通过这个函数，我们可以将部分调用参数提前绑定到函数身上成为一

iterators must define all five (or six if iterator_concept is included) typedefs or use a special placeholder tag for not- defined typedefs. This is necessary for post-C++20 iterators like preview::rang

namespaces: https://www.ibm.com/docs/en/zos/2.4.0?topic=only-inline-namespace- definitions-c11 • Placeholder type in template specialization: https://eel.is/c++draft/dcl.spec.auto#general-13NOTICE: This

the results ▪ Thread-local logger threadLocalSummation.cppFuture A future is a non-mutable placeholder for a value, which is set by a promise. auto future = std::async([]{ return "LazyOrEager"; });