c++ unordered set count
// unordered_set::count #include <iostream> #include <string> #include <unordered_set> int main () { std::unordered_set<std::string> myset = { "hat", "umbrella", "suit" }; for (auto& x: {"hat","sunglasses","suit","t-shirt"}) { if (myset.count(x)>0) std::cout << "myset has " << x << std::endl; else std::cout << "myset has no " << x << std::endl; } return 0; }
Source: cplusplus.com