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Defect Report: wstring_convert methods do not take allocator instance
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Glen Fernandes
Dec 14, 2012, 12:10:18 PM12/14/12
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The wstring_convert class template, described in 22.3.3.2.2 [conversions.string], does not support custom stateful allocators. It only supports custom stateless allocators.
The to_bytes member function returns basic_string<char, char_traits<char>, Byte_alloc> but it does not take an instance of Byte_alloc to pass to the constructor of the basic_string.
Similarly the from_bytes member function returns basic_string<Elem, char_traits<Elem>, Wide_alloc> but it does not take an instance of Wide_alloc to pass to the constructor of the basic_string.
This makes these two member functions and the wstring_convert class template not usable when Wide_alloc or Byte_alloc are stateful allocators.
Glen Fernandes
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The to_bytes member function returns basic_string<char, char_traits<char>, Byte_alloc> but it does not take an instance of Byte_alloc to pass to the constructor of the basic_string.
Similarly the from_bytes member function returns basic_string<Elem, char_traits<Elem>, Wide_alloc> but it does not take an instance of Wide_alloc to pass to the constructor of the basic_string.
This makes these two member functions and the wstring_convert class template not usable when Wide_alloc or Byte_alloc are stateful allocators.
Glen Fernandes
--
[ comp.std.c++ is moderated. To submit articles, try posting with your ]
[ newsreader. If that fails, use mailto:std-cpp...@vandevoorde.com ]
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Daniel Krügler
Dec 19, 2012, 5:19:48 PM12/19/12
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Am 14.12.2012 18:10, schrieb Glen Fernandes:
> The wstring_convert class template, described in 22.3.3.2.2 [conversions.string], does not support custom stateful allocators. It only supports custom stateless allocators.
>
> The to_bytes member function returns basic_string<char, char_traits<char>, Byte_alloc> but it does not take an instance of Byte_alloc to pass to the constructor of the basic_string.
>
> Similarly the from_bytes member function returns basic_string<Elem, char_traits<Elem>, Wide_alloc> but it does not take an instance of Wide_alloc to pass to the constructor of the basic_string.
>
> This makes these two member functions and the wstring_convert class template not usable when Wide_alloc or Byte_alloc are stateful allocators.
The report has been forwarded to the Library Working Group.
> The wstring_convert class template, described in 22.3.3.2.2 [conversions.string], does not support custom stateful allocators. It only supports custom stateless allocators.
>
> The to_bytes member function returns basic_string<char, char_traits<char>, Byte_alloc> but it does not take an instance of Byte_alloc to pass to the constructor of the basic_string.
>
> Similarly the from_bytes member function returns basic_string<Elem, char_traits<Elem>, Wide_alloc> but it does not take an instance of Wide_alloc to pass to the constructor of the basic_string.
>
> This makes these two member functions and the wstring_convert class template not usable when Wide_alloc or Byte_alloc are stateful allocators.
Greetings from Bremen,
Daniel Krügler
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