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If any of the members required are placed in the private section, the corresponding operations become illegal The operators most commonly placed in the private section are the copy constructor and operator= You also need to understand what happens when you fail to provide a default constructor, copy constructor, destructor, or operator=If you do not provide any constructors, a default zero-parameter constructor is created It performs a member-by-member construction of the class data members If you provide a string ( const char * ) constructor but no string ( ) constructor, you merely disallow uninitialized string definitions If you do not provide a copy constructor, a default copy constructor is created It performs member-by-member copy construction Note that if the copy constructor is disabled for some member, this approach generates a compiler error If you do not provide a destructor, a default destructor is created and performs member-by-member destruction (in inverse order of the member declarations) Finally, if you do not provide operator=,a default is created and performs member-by-member copying, using each member's operator=AS with the copy constructor, if operator= is disabled for some member, a compiler error is generated
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Once we have some classes, we can use objects of these classes as data members of other classes This practice is called composition As an example, Figure 228 illustrates a few methods of the Employee class Once the classes that define the data members have implemented operator<<, writing operator<< for our new class is a simple matter We could easily have added other data members For instance, if a Date class is written, we can add a hired data member of type Date
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1 class Employee 2 { 3 public: 4 void setvalue( const string & n , double s ) 5 { name = n; salary = s; } 6 7 void print( ostream & out = cout ) const 8 ( out << name < < ( " << salary < < ) 9 10 / I Other general accessors and mutators, not shown 11 private: 12 string name; 13 double salary; 14 1 ; 15 16 / / Define an output operator for Employee 17 ostream & operator<< ( ostream & out, const Employee & rhs 18 { 19 rhs print( out ) ; 20 return out; 21 > 22 23 int main( ) 24 ( 25 vector<Employee> v( 3 ) ; 26 V [ 0 ] setvalue ( "Bill Clinton", 20000000 ) ; 27 28 V[ 1 ]setvalue( "Bill Gates", 200000000000 ) ; 29 V [ 2 1 setvalue( "Billy the Marlin", 6000000 ) ; 30 31 for( int i = 0; i < vsize( ) ; i++ ) 32 cout << v[ i ] < < endl; 33 34 return 0; 35 1
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In this chapter we described the C++ class construct The class is the C++ mechanism used to create new types Through it we can define construction and destruction of objects, define copy semantics, define input and output operations, overload almost all operators, define implicit and explicit type conversion operations (sometimes a bad thing), and provide for information hiding and atomicity The class consists of two parts: the interface and the implementation The interface tells the user of the class what the class does The implementation does it The implementation frequently contains proprietary code and in some cases is distributed only in precompiled form Information hiding can be enforced by using the p r i v a t e section in the interface Initialization of objects is controlled by the constructor functions, and the destructor function is called when an object goes out of scope The destructor typically performs clean up work, closing files and freeing memory Finally, when implementing a class, the use of const and correct parameter passing mechanisms, as well as the decision about whether to accept a default for the Big Three, write our own Big Three, or completely disallow copying is crucial for not only efficiency but also in some cases, correctness
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