my_type); return static_cast(hasher); } OK, but how do I stick this into a std::unordered_set/map ?2024 Victor Ciura | @ciura_victor - Unleashing 🦀 The Ferris Within 47 GenericHash hasher; hash_append(hasher, t); return static_cast(hasher); } }; std::unordered_set> my_set;2024 Victor Ciura | @ciura_victor - Unleashing 🦀 The etc. std::unordered_set> my_set; std::unordered_set> my_set; std::unordered_set> my_set; std::unordered_set>

coll, const T& val) { coll.push_back(val); } std::vector coll1; std::set coll2;std::unordered_set uset; add(coll1, 42); // OK add(coll2, 42); // ERROR: no push_back() C++98 Nico T> void add(CollT& coll, const T& val) { coll.push_back(val); } std::vector coll; std::unordered_set add(coll, 42); // OK add(u 42); // uses 2nd add() calling insert() C++98 Nico Josuttis void add(auto& coll, const auto& val) { coll.push_back(val); } std::vector coll; std::unordered_set u; add(coll, 42); // OK add(us, 42); // uses 2nd add() calling insert() "Abbreviated

set • multimap • multiset 21 • Unordered associative containers • unordered_map (C++11) • unordered_set (C++11) • unordered_multimap (C++11) • unordered_multiset (C++11) • Container adaptors • queue where an element's position is irrelevant • Implemented using hash tables • unordered_map, unordered_set, unordered_multimap, unordered_multiset 47CppCon 2021 – Back to Basics: Classic STL Copyright class Hash = hash, class Pred = equal_to, class Allocator = allocator> class unordered_set; • Features • Supports amortized constant time element lookup • Elements of type Key are stored

foo::bar::Bar*; // A set of measurements. Just an alias for user convenience. using TimeSeries = std::unordered_set, DataPointComparator>; } // namespace a These aliases don’t document DataPoint = foo::bar::Bar*; using std::unordered_set; // Bad: just for local convenience using std::hash; // Bad: just for local convenience typedef unordered_set, DataPointComparator> classes, explicitly marked internal namespaces, and in .cc files: // In a .cc file using std::unordered_set; Naming The most important consistency rules are those that govern naming. The style of a name

criterion / hash function type (since C++20) ##include Joratexit () ##include <unordered_set> int main() { ata: :atexit(T OUT Jambda to be called on regular 站 auto hashFunc = [] (const autog obj) { /lambdato be used as hashfunction return 有 std: :unordered_set coll GE

class KeyEqual = std::equal_to, class Allocator = std::allocator > class unordered_set; template< class T, class Deleter = std::default_delete > class unique_ptr;2. The

C++11 introduces two unordered containers: std::unordered_map/std::unordered_multimap and std::unordered_set/std::unordered_multiset. Their usage is basically similar to the original std::map/std::mult