The erase() Member Function of Associative Containers

The associative containers std::map, std::multimap, std::set, and std::multiset have the following three overloaded forms of the member function erase():

 class map // simplified for brevity{public://..other members void erase(iterator position); // 1 size_type erase(const key_type& x); // 2 void erase(iterator first, iterator last); // 3};

The first version takes an iterator pointing at an existing container element and erases it. For example, the following code erases the last element of the container:

 employees.erase(employees.rbegin());

Remember that an element of an associative container is a pair of two values: a key and its associated value. The second version of erase() enables you to erase an element using its key. For example, suppose you have created the following map object:

 std::map< int, std::string > employees;//.. fill map// erase the element whose first member equals 2employees.erase(2); 

The third version of erase() deletes a sequence of elements whose bounds are indicated by the iterators first and last. For example, the following statement erases all the elements of a map:

 employees.erase(employees.begin(), employees.end());

Of course, you can use the clear() member function to achieve the same effect because clear() simply calls erase(begin(), end());

Share the Post:
Share on facebook
Share on twitter
Share on linkedin

Overview

The Latest

iOS app development

The Future of iOS App Development: Trends to Watch

When it launched in 2008, the Apple App Store only had 500 apps available. By the first quarter of 2022, the store had about 2.18 million iOS-exclusive apps. Average monthly app releases for the platform reached 34,000 in the first half of 2022, indicating rapid growth in iOS app development.

microsoft careers

Top Careers at Microsoft

Microsoft has gained its position as one of the top companies in the world, and Microsoft careers are flourishing. This multinational company is efficiently developing popular software and computers with other consumer electronics. It is a dream come true for so many people to acquire a high paid, high-prestige job

your company's audio

4 Areas of Your Company Where Your Audio Really Matters

Your company probably relies on audio more than you realize. Whether you’re creating a spoken text message to a colleague or giving a speech, you want your audio to shine. Otherwise, you could cause avoidable friction points and potentially hurt your brand reputation. For example, let’s say you create a