Visual C++ - const_cast

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The object buf holds the string "Test". The object cp is a non constant pointer pointing to constant value. We are going to change the value by doing const_cast. ncp is a non constant pointer pointing to non constant value. ncp is assigned with cp by const_cast. The value is changed using ncp and it directly affects the buf object. Again const char* is converted back to char* pointer using const cast at the last step cncp. cncp is pointing to buf and it is displayed out on the screen.

Source Code

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int _tmain(int argc, _TCHAR* argv[])

{

    char buf[128] = "Test";

    const char *cp = buf;

    char *ncp = const_cast(cp); // Converting const char* to char*

 

    strcpy(ncp, "non const write successfull\n\n");

 

    const char *cncp = const_cast(ncp); // Converting char* to const char*

 

    std::cout << cncp; // cncp is pointing to buf

 

    return 0;

}

 

Output

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non const write successfull

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