Midterm 2. 7] Explain in your own words the concept of a handle class and how it s implemented in C++: What s wrong with this answer?
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1 Midterm 2 7] Explain in your own words the concept of a handle class and how it s implemented in C++: What s wrong with this answer? A handle class is a pointer vith no visible type.
2 What s wrong with this answer? A handle class is a pointer vith no visible type. A handle class is a class, not a pointer! (Yes, it does contain a pointer ) The type of any pointer must be visible it s part of the pointer declaration! (Yes, the definition of that type is in another file )
3 Midterm 2, programming problem 1
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5 Testing
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7 Midterm 2, programming problem 2
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9
10
11 This function is leaking a pointer to a local variable!
12
13 Ch. 11: References & the Copy-Constructor - continued -
14 Remember returning objects by value from a function
15 B2 s address The address of B2 is pushed before making the call. The function copies the returned object at that address before returning.
16 What can go wrong when copying?
17 Similar to the text program C11:HowMany.cpp Compile-time or run-time constant? Why here? Why not initialize inside the class, as we did in ch.8?
18
19
20 Conclusion The low-level, bit-by-bit copying doesn t always work correctly when combined with C++ constructors. We call this bitcopy, to distinguish it from copy-construction (next time).
21 We stop before the subsection Copy-construction To do for next time: Thoroughly read and understand the part of the section Copy-constructor covered so far. EOL 27
22 QUIZ Why is bit-copy sometimes not enough in C++?
23
24 The compiler s assumption is that you want to perform this creation using a bitcopy, and in many cases this may work fine, but in HowMany it doesn t fly because the meaning of initialization goes beyond simply copying. Another common example occurs if the class contains pointers what do they point to, and should you copy them or should they be connected to some new piece of memory?
25 [ ] intervene in this process and prevent the compiler from doing a bitcopy. You do this by defining your own function to be used whenever the compiler needs to make a new object from an existing object: We re making a new object, so this function is a constructor. The constructor has a single argument: the object we re constructing from. The argument is passed by reference! Example
26 This function is called whenever a new object is created from an existing one. In general: X(X&)
27 Extra-credit:
28 QUIZ 16. Write a class CCClass with: An integer data member A constructor that initializes the data member A copy-constructor that simply announces itself to cout.
29 Is the name needed here?
30 16. Now create: QUIZ a function that passes a CCClass object in by value and does not return anything another function that does not take any arguments, creates a local CCClass object, and returns it by value.
31
32 QUIZ 16. Call these functions in the main program.
33 How many times is the constructor called? How many times the copyconstructor?
34
35 What if we call the function, but ignore the return value? A: The compiler creates a temporary., so the C.C. is still called twice!
36 Default copy-constructor Because the copy-constructor implements pass and return by value, it s important that the compiler creates one for you in the case of simple structures effectively, the same thing it does in C. However, all you ve seen so far is the default primitive behavior: a bitcopy. When more complex types are involved, the C++ compiler will still automatically create a copy-constructor if you don t make one. Again, however, a bitcopy doesn t make sense, because it doesn t necessarily implement the proper meaning.
37 Default copy-constructor Suppose you create a new class composed of objects of several existing classes. This is called, appropriately enough, composition, and it s one of the ways you can make new classes from existing classes. Remember composition from Ch.1!
38 Ch. 1: Introduction to Objects
39 MORE GENERAL Reusing the implementation Composition Aggregation Association
40 Owner class Component class
41 Composition example (not in text)
42 Ch. 11: References & the Copy-Constructor - continued -
43
44 Do you remember what this means?
45
46 ??
47 Conclusion To create a copy-constructor for a class that uses composition (and inheritance, which is introduced in Chapter 14), the compiler recursively calls the copy-constructors for all the member objects (and base classes, for inheritance). The process the compiler goes through to synthesize a copy-constructor is called memberwise initialization.
48 Read the subsections: To do for next time: Preventing pass-by-value Functions that modify outside objects Re-read and grok the entire section Copyconstructor. Solve end-of-chapter ex. 17. EOL 28
49 QUIZ: What happens when the code passes or returns an object by value and its class does not have a copy-constructor?
50 Default copy-constructor To create a copy-constructor for a class that uses composition (and inheritance, which is introduced in Chapter 14), the compiler recursively calls the copy-constructors for all the member objects (and base classes, for inheritance).
51 QUIZ: What is memberwise initialization in C++?
52 The (recursive) process the compiler goes through to synthesize a copy-constructor is called memberwise initialization.
53 Preventing pass-by-value There s a simple technique for preventing pass-by-value: declare a private copy-constructor. If the user tries to pass or return the object by value, the compiler will produce an error message because the copyconstructor is private. It can no longer create a default copy-constructor because you ve explicitly stated that you re taking over that job.
54 Preventing pass-by-value There s a simple technique for preventing pass-by-value: declare a private copy-constructor. If the user tries to pass or return the object by value, the compiler will produce an error message because the copyconstructor is private. It can no longer create a default copy-constructor because you ve explicitly stated that you re taking over that job.
55 Deleted functions were introduced in C++11
56 Section A program that refers to a deleted function implicitly or explicitly, other than to declare it, is ill-formed.
57 QUIZ: Does this program compile?
58 QUIZ: Does this program compile?
59 Pointers to members A pointer is a variable that holds the address of some location. You can change what a pointer selects at runtime, and the destination of the pointer can be either data or a function. The C++ pointer-to-member follows this same concept, except that what it selects is a location inside a class.
60 Pointers to members The dilemma here is that a pointer needs an address, but there is no address inside a class; selecting a member of a class means offsetting into that class. You can t produce an actual address until you combine that offset with the starting address of a particular object. Examples
61 Remember how we access members of classes and structs: Examples
62 Remember how we declare and initialize ordinary pointers: int a = 42; int *aptr; aptr = &a; or int a = 42; int *aptr = &a; Examples
63 Examples
64 How to read this from R to L
65 QUIZ Create a class containing a double and a print( ) function that prints the double. Don t forget the constructor!
66
67 QUIZ In main( ), create a pointer to the data member.
68
69 QUIZ Create an object of your class and a pointer to that object.
70
71 QUIZ Manipulate the data member using both the object and the pointer to the object.
72
73 Pointers to members are quite limited: they can be assigned only to a specific location inside a class. We cannot increment or compare them like ordinary pointers.
74 Pointers to member functions Remember pointers to ordinary functions: int (*fp)(float); double* (*fp) (int, int*);
75 This code is not in the text example. It shows how to use the pointer fp.
76 QUIZ (continued) In main( ), create a pointer to the function member print().
77
78 QUIZ (continued) In main( ), call the function print() using both the function name and the pointer to the function.
79
80 Individual work: Read and understand the program PointerToMemberFunction2.cpp: How to use pointers to members inside objects
81 Homework for ch. 11 Provided as separate handout (also available on our webpage --> agapie.net) Due Friday, Nov. 13, at the beginning of class. Please hand in a hard-copy, do not ! EOL 29
Ch. 11: References & the Copy-Constructor. - continued -
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