C++11 introduces char16_t and char32_t to facilitate working with UTF-16- and UTF-32-encoded text strings. But the <iostream> library still only supports the implementation-defined wchar_t for multi-byte I/O.

Why has support for char16_t and char32_t not been added to the <iostream> library to complement the wchar_t support?

c++ c++11 iostream char16-t char32-t
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