From: Jason Green <news AT jgreen4 DOT fsnet DOT co DOT uk>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: djgpp complains about boolalpha
Date: Sun, 06 Feb 2000 13:03:42 +0000
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

"Thanhvu Nguyen" <txn131 AT psu DOT edu> wrote:

> ansi/iso standard provides data type bool .. and boolalpha will print out
> either true or false.
> no header needed .. it was compiled fine under vc++ 6
> 
> e.g
> bool boolean = false;
> cout << boolalpha << boolean << endl;
> 
> this will print "false"

According to C++PL3, boolalpha is declared in <iomanip>

Unfortunately, this does not seem to be the case with DJGPP. ;-(

I have found the formatting flag _IO_BOOLALPHA in libio.h but setting
this flag manually with cout.setf() has no effect so I guess that it
is not yet fully implemented in GCC.

For now, probably the best that can be acheived is to define a
conversion function:

#include <iostream>
using namespace std;

const char *bool_to_alpha(bool b){return(b?"true":"false");}

int main()
{
    bool boolean = false;
    cout << bool_to_alpha(boolean) << endl;
    return 0;
}