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Message-ID: <41C3ED85.5080900@kegel.com>
Date: Sat, 18 Dec 2004 09:44:00 -0000
From: Dan Kegel <dank@kegel.com>
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Subject: find_if and ptr_fun(isspace<char>) trouble
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I'm trying to port somebody else's code from g++-2.95.3 to g++-3.4.1, but am
running into template problems with STL algorithms and ptr_fun(isspace<char>).

Compiling the following snippet:

#include <cctype>
#include <functional>
#include <algorithm>
#include <deque>
#include <locale>
using namespace std;
int main ()
{
         char     init[7] = {1,2,3,4,5,6,7};
         deque<char> d(init, init+7);
         find_if (d.begin(), d.end(), ptr_fun(isspace<char>));
}

with either gcc-3.2.2 (redhat 9) or gcc-3.4.1 yields the following error:

/usr/include/c++/3.2.2/bits/stl_algo.h: In function `_RandomAccessIter
    std::find_if(_RandomAccessIter, _RandomAccessIter, _Predicate,
    std::random_access_iterator_tag) [with _RandomAccessIter =
    std::_Deque_iterator<char, char&, char*>, _Predicate =
    std::pointer_to_binary_function<char, const std::locale&, bool>]':
/usr/include/c++/3.2.2/bits/stl_algo.h:318:   instantiated from `_InputIter std::find_if(_InputIter, _InputIter, _Predicate) [with _InputIter = std::_Deque_iterator<char, char&, char*>, _Predicate = std::pointer_to_binary_function<char, 
const std::locale&, bool>]'
a.cc:13:   instantiated from here
/usr/include/c++/3.2.2/bits/stl_algo.h:252: no match for call to `(
    std::pointer_to_binary_function<char, const std::locale&, bool>) (char&)'
/usr/include/c++/3.2.2/bits/stl_function.h:465: candidates are: _Result
    std::pointer_to_binary_function<_Arg1, _Arg2, _Result>::operator()(_Arg1,
    _Arg2) const [with _Arg1 = char, _Arg2 = const std::locale&, _Result = bool]

(This is an improvement; the original code didn't specify which
isspace, and blew up in a worse way.)

Can anybody point out what's wrong?

Thanks,
Dan

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