Concept explainers
A vector is a container which performs like an extensible array.
- The size of the vector is dynamic.
- The series of elements are stored using the same variable name.
- It uses random-access iterator.
- If an element is added or removed, it adjusts its size automatically, which accommodates the number of elements contained in the vector.
Explanation of Solution
Emplacement:
The technique used by member function to insert new elements in a container is emplacement. When new object is inserted into a container it avoids creation of temporary objects in memory.
emplace() and emplace_back() emplacement member functions:
Two member function in a vector class uses emplacement technique namely: “emplace()” and “emaplace_back()”.
- These two member functions avoid the creation of memory when new object is inserted into a container.
- There is no need to instantiate the objects which are going to be inserted.
- The objects are just passed as an argument into the emplacement function.
- The emplacement function handles the creation of object and then forwards to the argument to its constructor.
Comparing “emplace()” and “emplace_back()” member function with “insert()” and “push_back()” :
The “insert()” and “push_back()” member functions creates a temporary memory when new objects are inserted into a container.
Whereas, the “empalce” and “emplace_back()” member function avoids the creation of memory when new objects are inserted into a container.
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Chapter 17 Solutions
EBK STARTING OUT WITH C++
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