53 lines
1.9 KiB
C++
53 lines
1.9 KiB
C++
|
// fig11_02.cpp
|
||
|
|
// Demonstrating unique_ptr.
|
||
|
|
#include <fmt/format.h>
|
||
|
|
#include <iostream>
|
||
|
|
#include <memory>
|
||
|
|
|
||
|
|
class Integer {
|
||
|
|
public:
|
||
|
|
// constructor
|
||
|
|
Integer(int i) : value{i} {
|
||
|
|
std::cout << fmt::format("Constructor for Integer {}\n", value);
|
||
|
|
}
|
||
|
|
|
||
|
|
// destructor
|
||
|
|
~Integer() {
|
||
|
|
std::cout << fmt::format("Destructor for Integer {}\n", value);
|
||
|
|
}
|
||
|
|
|
||
|
|
int getValue() const { return value; } // return Integer value
|
||
|
|
private:
|
||
|
|
int value{0};
|
||
|
|
};
|
||
|
|
|
||
|
|
// use unique_ptr to manipulate Integer object
|
||
|
|
int main() {
|
||
|
|
std::cout << "Creating a unique_ptr that points to an Integer\n";
|
||
|
|
|
||
|
|
// create a unique_ptr object and "aim" it at a new Integer object
|
||
|
|
auto ptr{std::make_unique<Integer>(7)};
|
||
|
|
|
||
|
|
// use unique_ptr to call an Integer member function
|
||
|
|
std::cout << fmt::format("Integer value: {}\n\nMain ends\n",
|
||
|
|
ptr->getValue());
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
/**************************************************************************
|
||
|
|
* (C) Copyright 1992-2022 by Deitel & Associates, Inc. and *
|
||
|
|
* Pearson Education, Inc. All Rights Reserved. *
|
||
|
|
* *
|
||
|
|
* DISCLAIMER: The authors and publisher of this book have used their *
|
||
|
|
* best efforts in preparing the book. These efforts include the *
|
||
|
|
* development, research, and testing of the theories and programs *
|
||
|
|
* to determine their effectiveness. The authors and publisher make *
|
||
|
|
* no warranty of any kind, expressed or implied, with regard to these *
|
||
|
|
* programs or to the documentation contained in these books. The authors *
|
||
|
|
* and publisher shall not be liable in any event for incidental or *
|
||
|
|
* consequential damages in connection with, or arising out of, the *
|
||
|
|
* furnishing, performance, or use of these programs. *
|
||
|
|
**************************************************************************/
|