Passing a const Pointer - C++ Data Type

C++ examples for Data Type:const

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Description

Passing a const Pointer

Demo Code

                                               
#include <iostream> 
                                                  
class SimpleCat /*from  w  w  w . j a v  a  2  s  . c  o  m*/
{ 
public: 
    SimpleCat(); 
    SimpleCat(SimpleCat&); 
    ~SimpleCat(); 
                                                  
    int GetAge() const { return itsAge; } 
    void SetAge(int age) { itsAge = age; } 
                                                  
private: 
    int itsAge; 
}; 
                                                  
SimpleCat::SimpleCat() 
{ 
    std::cout << "Simple Cat Constructor ..." << std::endl; 
    itsAge = 1; 
} 
                                                  
SimpleCat::SimpleCat(SimpleCat&) 
{ 
    std::cout << "Simple Cat Copy Constructor ..." << std::endl; 
} 
                                                  
SimpleCat::~SimpleCat() 
{ 
    std::cout << "Simple Cat Destructor ..." << std::endl; 
} 
                                                
const SimpleCat * const  
FunctionTwo (const SimpleCat *const theCat); 
                                                  
int main() 
{ 
    std::cout << "Making a cat ..." << std::endl; 
    SimpleCat Frisky; 
    std::cout << "Frisky is "; 
    std::cout << Frisky.GetAge() << " years old" << std::endl; 
    int age = 5; 
    Frisky.SetAge(age); 
    std::cout << "Frisky is "; 
    std::cout << Frisky.GetAge() << " years old" << std::endl; 
    std::cout << "Calling FunctionTwo ..." << std::endl; 
    FunctionTwo(&Frisky); 
    std::cout << "Frisky is "; 
    std::cout << Frisky.GetAge() << " years old" << std::endl; 
    return 0; 
} 
                                                  
// functionTwo, passes a const pointer 
const SimpleCat * const  
FunctionTwo (const SimpleCat * const theCat) 
{ 
    std::cout << "Function Two. Returning ..." << std::endl; 
    std::cout << "Frisky is now " << theCat->GetAge(); 
    std::cout << " years old \n"; 
    // theCat->SetAge(8); const! 
    return theCat; 
 }

Result


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