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Section: D.22 [depr.locale.stdcvt] Status: New Submitter: Jonathan Wakely Opened: 2015-06-08 Last modified: 2017-05-13
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The enumeration type codecvt_mode is effectively a bitmask type (188.8.131.52.4 [bitmask.types]) with three elements, but isn't defined as such.This harms usability because bitmask types are required to work well with bitwise operators, but codecvt_mode doesn't have overloaded operators, making it very inconvenient to combine values:
std::codecvt_utf16<char32_t, 0x10FFFF, static_cast<std::codecvt_mode>(std::little_endian|std::generate_header)> cvt;
The static_cast harms readability and should not be necessary.I suggest that either codecvt_mode is specified to be a bitmask type, or as a minimal fix we provide an overloaded operator| that returns the right type.