An error from a simple test for BOOL type in visual C++

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I did a simple test on BOOL type as below:

#include <iostream>
#include <windef.h>

int main()
{
    BOOL test=TRUE;

    std::cout << "Hello World!\n";
    std::cout << " test is of BOOL =" << test << std::endl;

}

I got this error message:

Error (active)	E0020	identifier "PSLIST_HEADER" is undefined	....

not sure how to resolve this error and seek help from gurus here.

What I have tried:

I tried to include these header files too:BaseTsd.h, WinNT.h, but it does not help.

Posted 4-Oct-21 10:03am

Southmountain

Updated 4-Oct-21 12:32pm

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k5054 · Accepted Answer · 2021-10-04T12:32:00

Try adding #include <windows.h> before the windef.h header. But unless you need to interact with code using BOOL you should probably use the C++ bool type:

C++

#include <iostream>
#include <iomanip>  //for std::boolaplha

int main()
{
    bool test = true;
    std::cout << "test = " << test << '\n'; // prints "test is 1"
    std::cout <<  std::boolalpha;
    std::cout << "test = " << test << '\n'; // prints "test = true"
}