C Map Add New Element
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C Map Add New Element
This pair consists of a key and an element corresponding to that key. To add an element to a vector we can use the push_back () function. After insertion, the reordering of elements takes place and the map is sorted w.r.t the key.
After insertion, the reordering of elements takes place and the map is sorted w.r.t the key. The single element versions (1) return a pair, with its member pair::first set to an iterator pointing to either the newly inserted element or to the element with an equivalent key in the map. This function inserts the pair in the map.
Take the existing item and modify it.
Use the insert member function to add a new element to std::map in c++. Operator [] needs the default constructor because the map checks if the element exists. C++98 pair<iterator,bool> insert (const value_type& val); The function does not insert the key and element in the map if the key already exists in the map.
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