The unordered_set::bucket() method is a builtin function in C++ STL which returns the bucket number of a specific element. That is, this function returns the bucket number where a specific element is stored in the unordered_set container. The bucket is a slot in the unordered_set’s internal hash table where elements are stored....

The unordered_set::reserve() method is a builtin function in C++ STL which is used to request capacity change of unordered_set. It sets the number of buckets in the container to contain at least n elements. If n is greater than the current bucket_count multiplied by the max_load_factor, the container’s bucket_count is increased and a rehash is forced. If n is lower than the bucket_count, then the function has no effect on it....

The unordered_set::emplace() function is a built-in function in C++ STL which is used to insert an element in an unordered_set container. The element is inserted only if it is not already present in the container. This insertion also effectively increases the container size 1.Syntax:...

The unordered_set::bucket_size() function is a built-in function in C++ STL which returns the total number of elements present in a specific bucket in an unordered_set container.The bucket is a slot in the unordered_set’s internal hash table where elements are stored.Note: Buckets in unordered_set are numbered from 0 to n-1, where n is the total number of buckets.Syntax:...

If we have a function in base class and another function with the same name in derived class, can the base class function be called from derived class object? This is an interesting question and as an experiment, predict the output of the following C++ program:...

The multimap::value_comp() method returns a comparison object that can be used to compare two elements to get whether the key of the first one goes before the second. Here the 1st object compares the object of type std::multimap::type. The arguments taken by this function object are of member type type. It is defined in multimap as an alias of pair....

The function log2() of cmath header file in C++ is used to find the logarithmic value with base 2 of the passed argument....

The std::add_cv template of C++ STL is present in the <type_traits> header file. The std::add_cv template of C++ STL is used to get the type T with const and volatile qualification. The function std::is_same::value is used to check whether T is a const and volatile qualification or not....

The ‘=’ is an operator in C++ STL which copies (or moves) an unordered_multiset to another unordered_multiset and unordered_multiset::operator= is the corresponding operator function. There are three versions of this function:...

The iswcntrl() is a built-in function in C++ STL which checks if the given wide character is a control character or not. It is defined within the cwctype header file of C/C++....

The wcstoll() function in C/C++ converts a wide-character string to a long long integer. It sets the pointer to point the first character after the last character....

The unordered_multimap::max_load_factor() is a built-in function in C++ STL which returns the maximum load factor of the unordered_multimap container. This function also provides with an option of setting the maximum load factor....