29 дек. 2015 г. · In C++20, you can use the contains method (added to all associative containers if I am not mistaken): if (my_map.contains(k1) && my_map[k1].contains(k2)) {

13 июл. 2021 г. · In Java, containsValue() function checks whether a hashmap contains a specific value. It looks for values, not for keys. How to achieve that in c++?

23 мая 2016 г. · The reason I have map to pointer is that node is not a trivial class and have other member variable so using unordered_map<node,node> is out of ...

10 июн. 2013 г. · I am trying to use a custom class as key for an unordered_map, like the following: #include <iostream> #include <algorithm> #include <unordered_map> using ...

28 авг. 2016 г. · I am writing a Google Test unit test, and I want to check if the content of an unordered_map<std::string, std::string> is the same as an std::map<std::string, ...

16 мая 2013 г. · We are working on a game project for school in c++. I'm in charge of the map object, who will contain Entities like bombs, players, walls and ...

13 дек. 2011 г. · The map in question is a unordered_map<string, double>. I'd then like to obtain the keys as a vector<string>, and the values as a vector<double>.

18 февр. 2022 г. · There is a function that takes a std::unordered_map and checks to see if a key is present in the map.

28 окт. 2020 г. · To simply check if an element exists, you can use the map's find() or count() method, or in C++20 the contains() method.

7 апр. 2018 г. · I have C++ code that investigates a BIG string and matches lots of substrings. As much as possible, I avoid constructing std::strings, by encoding substrings ...