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cout << "Contents of i_ar3 after receiving value from f(i_ar): "; for(int i=0; i < i_ar3getlen(); ++i) cout << i_ar3[i] << " "; cout << "\n\n"; cout << "Of course, dyn_safe_array works with class types, too\n"; dyn_safe_array<myclass, 3> mc_ar; cout << "Original contents of mc_ar: "; for(int i=0; i < mc_argetlen(); ++i) cout << mc_ar[i]x << " "; cout << endl; mc_ar[0]x = 9; mc_ar[1]x = 8; mc_ar[2]x = 7; cout << "Values in mc_ar after setting them: "; for(int i=0; i < mc_argetlen(); ++i) cout << mc_ar[i]x << " "; cout << "\n\n"; cout << "Now, create mc_ar2 and then execute this statement:\n" << " mc_ar2 = f(mc_ar);\n\n"; dyn_safe_array<myclass, 3> mc_ar2; mc_ar2 = f(mc_ar); cout << "Contents of mc_ar2 after receiving f(mc_ar): "; for(int i=0; i < mc_ar2getlen(); ++i) cout << mc_ar2[i]x << " "; cout << endl; return 0; }
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The output is shown here:
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Contents of i_ar: 0 1 2 3 4 Create i_ar2 and initialize it with i_ar This results in dyn_safe_array's copy constructor being called Using dyn_safe_array's copy constructor to make a copy Contents of i_ar2: 0 1 2 3 4 Create i_ar3 Original contents of i_ar3: 0 0 0 0 0 Now, this line will execute: i_ar3 = f(i_ar); This will result in the following sequence of events: 1 dyn_safe_array's copy constructor is called to make a copy of i_ar that is passed to the x parameter of f() 2 The copy constructor is called again when a copy is made for the return value of f() 3 The overloaded assignment operator is called to assign the result of f() to i_ar3 Using dyn_safe_array's copy constructor to make a copy f() is returning a copy of x Using dyn_safe_array's copy constructor to make a copy Assigning one dyn_safe_array object to another
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Contents of i_ar3 after receiving value from f(i_ar): 0 1 2 3 4 Of course, dyn_safe_array works with class types, too Original contents of mc_ar: -1 -1 -1 Values in mc_ar after setting them: 9 8 7 Now, create mc_ar2 and then execute this statement: mc_ar2 = f(mc_ar); Using dyn_safe_array's copy constructor to make a copy f() is returning a copy of x Using dyn_safe_array's copy constructor to make a copy Assigning one dyn_safe_array object to another Contents of mc_ar2 after receiving f(mc_ar): 9 8 7
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As explained in the discussion, the most common form of copy constructor has only one parameter that is a reference to an object of the class for which the copy constructor is defined However, it is permissible for a copy constructor to have additional parameters as long as they have default arguments For example, assuming the dyn_safe_array class, the following declaration specifies a valid copy constructor:
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dyn_safe_array(const dyn_safe_array &obj, int num = -1);
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Here, the num parameter defaults to 1 You could use this constructor to allow only the first num elements of the new dyn_safe_array to be initialized by the first num elements of obj The remaining elements can be given a default value When num is 1, the entire array is initialized by obj This version of the copy constructor could be written like this:
// If num is not 1, initialize the first num elements of a safe array // using the value from obj The remaining elements get default values // Otherwise, initialize the entire array with the elements from obj template <class T, int len> dyn_safe_array<T, len>::dyn_safe_array(const dyn_safe_array &obj, int num) { cout << "Using dyn_safe_array's copy constructor to make a copy\n"; try { // Allocate an array of the same size as the // one used by obj aptr = new T[objlength]; } catch(bad_alloc ba) { // Take appropriate action here This is just // a placeholder response cout << "Can't allocate array\n"; exit(1); } length = objlength; // Copy contents of obj, up to the number passed via num
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