operators (std::unordered_map) operators (std::unordered_multimap) operators (std::unordered_multiset) operators (std::unordered_set) operators (std::vector) remove_if remove_if std::array std::array::at std::array::back std::array::begin ...
unordered_map<std::string,std::string>myMap;print_result(myMap.insert_or_assign("a","apple"));print_result(myMap.insert_or_assign("b","banana"));print_result(myMap.insert_or_assign("c","cherry"));print_result(myMap.insert_or_assign("c","clementine"));for(constauto&node:myMap)...
鉴于此,C++17引入了std::try_emplace,在参数列表中,把key和value分开,该方法会检测指定的key是否存在,如果存在,什么也不做,不存在,则插入相应的value。 此外,C++17为map容器还新增了insert_or_assign方法,让我们无需像之前一样,额外编写先判断是否存在,不存在则插入,存在则更新的代码了。 废话不多说,看简单的d...
std::unordered_map中的键与散列 、、 在C++98中,我将使用template<class Key, class T> class std::map使用Key作为在T上计算的哈希typedef std::stringobject_hash; std::map<object_hash, object> hash_map;object_hash insert_or_ 浏览0提问于2019-01-13得票数 1 回答已采纳 ...
__cpp_lib_map_try_emplace 201411L (C++17) std::map::try_emplace, std::map::insert_or_assign __cpp_lib_associative_heterogeneous_insertion 202311L (C++26) Heterogeneous overloads for the remaining member functions in ordered and unordered associative containers. Overloads (3) and (6)....