delorie.com/archives/browse.cgi   search  
Mail Archives: djgpp/2000/02/06/09:09:14

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
Organization: Customer of Planet Online
Lines: 34
Message-ID: <naqq9sk8i9pjtq5mk7sqk939e3doftq462@4ax.com>
References: <87hepf$v0k AT r02n01 DOT cac DOT psu DOT edu> <03ro9sc0e7cpef036bce65r6f0nbobib1a AT 4ax DOT com> <87ikuu$e22 AT r02n01 DOT cac DOT psu DOT edu>
NNTP-Posting-Host: modem-248.indium.dialup.pol.co.uk
Mime-Version: 1.0
X-Trace: news6.svr.pol.co.uk 949842650 16833 62.136.40.248 (6 Feb 2000 13:10:50 GMT)
NNTP-Posting-Date: 6 Feb 2000 13:10:50 GMT
X-Complaints-To: abuse AT theplanet DOT net
X-Newsreader: Forte Agent 1.7/32.534
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
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;
}

- Raw text -


  webmaster     delorie software   privacy  
  Copyright © 2019   by DJ Delorie     Updated Jul 2019