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Chapter 11: Problem 25

The following is the first line of the copy constructor definition for the class StringVar. The identifier StringVar occurs three times and means something slightly different each time. What does it mean in each of the three cases? StringVar::StringVar(const StringVar\& string_object)

Short Answer

Expert verified
Answer: The three occurrences of "StringVar" in the given line of code represent the following: 1. The class name, for which the copy constructor is being defined. 2. The name of the constructor, in this case, it's a copy constructor. 3. The parameter type in the copy constructor, indicating a reference to a constant object of the class "StringVar" that will be copied to create a new object.

Step by step solution

01

First occurence of "StringVar"

The first occurrence of "StringVar" refers to the class name itself. In this case, it's the name of the class for which the copy constructor is being defined.
02

Second occurence of "StringVar"

The second occurrence of "StringVar" refers to the constructor's name. In C++, the constructor has the same name as the class. As this is a copy constructor, it's a special type of constructor used to create a new object as a copy of an existing object of the same type.
03

Third occurence of "StringVar"

The third occurrence of "StringVar" appears within the parameter list of the copy constructor, specifically in the form of "const StringVar\&". Here, "StringVar" is used as the type of the parameter "string_object". It indicates that the copy constructor takes a reference to a constant object of the class "StringVar" as its argument. This is the object that will be copied during the construction of the new object.

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