Documentation Home >> Headers >> <jss/concurrent_map.hpp> Header >> jss::concurrent_map >> operator[] subscript operator

Return a copy of the value associated with the specified key in a given jss::concurrent_map object. If there is no such value at the point of the call, insert one, as-if map.emplace(key,DataType()), and return a copy of that value.

DataType operator[](KeyType const& key);


A copy of the value associated with key in *this at the point of the call. If there is no such value, creates one as-if this->emplace(key,DataType()), and returns a copy of the newly-constructed value.


Any exceptions thrown by the default constructor, copy constructor or move constructor of DataType. Any exception thrown by the application of the Hasher or KeyEquals objects.


operator[]() may be called concurrently with any other member function of jss::concurrent_map on a given instance (except for the constructor and destructor) without external synchronization.


#include <jss/concurrent_map.hpp>

See Also