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Chapter 17, Problem 1RQE
Program Plan Intro

Vector:

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.

Expert Solution & Answer
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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

Starting Out with C++ from Control Structures to Objects Plus MyLab Programming with Pearson eText -- Access Card Package (9th Edition)

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