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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