Re: [Mingw-users] transform string tolower + iostream = error

[Oscar F. <of...@wa...>]

Greg Chicares <chi...@mi...> writes:

> Josuttis's example is given below, with comeau and g++3.1
> results: comeau accepts the code without diagnostics, and
> g++ rejects it.

Thanks for the example. 

This is the real problem:

#include <algorithm>
#include <string>

template <typename T> T foo(T v, T w) { return v+w; }

char foo(char v) { return v; }

int main() {
  std::string s("hello");
  std::transform( s.begin(), s.end(), s.begin(), foo);
}

(g++ 3.2)
d:/des/cppExp # t:/mingw/bin/g++ tolo3.cpp
tolo3.cpp: In function `int main()':
tolo3.cpp:14: no matching function for call to `transform(
   __gnu_cxx::__normal_iterator<char*, std::basic_string<char, 
   std::char_traits<char>, std::allocator<char> > >, 
   __gnu_cxx::__normal_iterator<char*, std::basic_string<char, 
   std::char_traits<char>, std::allocator<char> > >, 
   __gnu_cxx::__normal_iterator<char*, std::basic_string<char, 
   std::char_traits<char>, std::allocator<char> > >, <unknown type>)'


D:\Des\cppExp>como --A -strict --long_long tolo3.cpp
Comeau C/C++ 4.3.0.1 (Aug 21 2002 15:45:32) for MS_WINDOWS_x86
Copyright 1988-2002 Comeau Computing.  All rights reserved.
MODE:strict errors C++

[snipped prelinker messages]
Comeau C/C++ 4.3.0.1 (Aug 21 2002 15:45:32) for MS_WINDOWS_x86
Copyright 1988-2002 Comeau Computing.  All rights reserved.
MODE:strict errors C++


*Now*, it seems there is a bug either on g++ or on como 

Bets anyone?  ;-)


[snip]

> In fact, libcomo uses the same technique: include
> the C <ctype.h> header, then import the names into
> namespace std with using-declarations.

Comeau and GCC are C/C++ compilers. They save work by re-cycling the C
standard libraries, sacrificing C++ compliance.

[snipped Josutti's example and compiler output]

Thanks again.

-- 
Oscar