Bug#144409: marked as done (g++-3.0: does not support transform(begin,end,begin,tolower) idiom)
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Received: (at submit) by bugs.debian.org; 24 Apr 2002 19:36:09 +0000
>From shalehperry@attbi.com Wed Apr 24 14:36:09 2002
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From: Sean Perry <shalehperry@attbi.com>
To: Debian Bug Tracking System <submit@bugs.debian.org>
Subject: g++-3.0: does not support transform(begin,end,begin,tolower) idiom
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Date: Wed, 24 Apr 2002 12:35:38 -0700
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Package: g++-3.0
Version: 1:3.0.4-7
Severity: normal
the code below is from Josuttis' "The C++ standard library" and I have seen it
elsewhere. It works under 2.95.4.
#include <string>
#include <algorithm>
#include <cctype>
#include <iostream>
using namespace std;
int main(int argc, char* argv[]) {
string foo = "Some Mixed Case Text";
cout << foo << endl;
transform(foo.begin(), foo.end(), foo.begin(), tolower);
cout << foo << endl;
exit(0);
}
The problem seems to be the second use of foo.begin().
-- System Information
Debian Release: 3.0
Architecture: i386
Kernel: Linux one 2.4.18 #1 Sat Mar 9 08:43:28 PST 2002 i686
Locale: LANG=C, LC_CTYPE=en_US
Versions of packages g++-3.0 depends on:
ii gcc-3.0 1:3.0.4-7 The GNU C compiler.
ii gcc-3.0-base 1:3.0.4-7 The GNU Compiler Collection (base
ii libc6 2.2.5-4 GNU C Library: Shared libraries an
ii libstdc++3-dev 1:3.0.4-7 The GNU stdc++ library version 3 (
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>From doko@cs.tu-berlin.de Sat Nov 16 06:54:36 2002
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From: Matthias Klose <doko@cs.tu-berlin.de>
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Date: Sat, 16 Nov 2002 13:50:55 +0100
To: "Sean 'Shaleh' Perry" <shalehperry@attbi.com>, 144409-done@bugs.debian.org
Subject: Re: Bug#144409: g++-3.0: does not support transform(begin,end,be
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References: <m3it6gwxi1.fsf@mira.informatik.hu-berlin.de>
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Closing the report with Martin's explanation.
Sean 'Shaleh' Perry writes:
> >> int main(int argc, char* argv[]) {
> >> string foo = "Some Mixed Case Text";
> >> cout << foo << endl;
> >> transform(foo.begin(), foo.end(), foo.begin(), tolower);
> >
> > The compiler can't properly resolve "tolower": The problem is that
> > tolower is not only a function in namespace std, it is also a template
> > (22.1.3/2). Therefore, in the call to transform, template argument
> > deduction fails because of the ambiguity.
> >
> > You can fix your code in the following ways:
> > 1. Define a wrapper function around tolower that you pass to
> > transform.
> > 2. Explicitly select the tolower you want to use, by writing
> >
> > transform(foo.begin(), foo.end(), foo.begin(),
> > (int(*)(int))std::tolower);
> >
> > The cast causes, on the one hand, an explicit overload resolution
> > in favour of the function; it also allows the compiler to properly
> > deduce the third argument to transform.
> >
>
> man, neither option is particularly pretty, but the cast does let the code
> compile.
>
> I suppose I can define my own tolower() function based on the library's
> version rather than use a wrapper.
>
> Thanks for helping Martin. It is disappointing that the above code breaks.
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