Another const_cast C++ program example in modifying the const object variable


Compiler: Visual C++ Express Edition 2005

Compiled on Platform: Windows XP Pro SP2

Header file: Standard

Additional project setting: Set project to be compiled as C++

Project -> your_project_name Properties -> Configuration Properties -> C/C++ -> Advanced -> Compiled As: Compiled as C++ Code (/TP)

Other info:

To do: Modifying the const variable by using const_cast modifier

To show: The C++ const_cast usage in modifying the const object variable


// Demonstrates the const_cast

#include <iostream>

using namespace std;


struct One


// test function

void funct1()

{ cout<<"Testing..."<<endl;}



// const argument, cannot be modified...

void funct2(const One& c)


// will generate warning/error...




int main(void)


One b;



return 0;



Output example:


There will be error message during the program building. Change c.funct1(); to the following statements recompile and rerun the program.


// remove the const...

One &noconst = const_cast<One> (c);

cout<<"The reference = "<<&noconst<<endl;


Rebuild and re-run the program. The following output should be expected.


The reference = 0012FF63

Press any key to continue . . .



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