`std::unordered_map::emplace` is a function in C++ that allows us to efficiently insert a new key-value pair into an unordered map container. This function takes the key and value as separate arguments and constructs the element in-place within the container, avoiding unnecessary copy or move operations. It returns a pair consisting of an iterator to the inserted element (or to the element with an equivalent key already in the container) and a boolean value indicating whether the insertion was successful or not. It is useful when we want to add a new element to the unordered map without the need for separate insert and value initialization steps.
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