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Showing content from https://cplusplus.github.io/LWG/issue2507 below:

codecvt_mode should be a bitmask type

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2507. codecvt_mode should be a bitmask type

Section: 99 [depr.locale.stdcvt] Status: New Submitter: Jonathan Wakely Opened: 2015-06-08 Last modified: 2017-04-22

Priority: 3

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Discussion:

The enumeration type codecvt_mode is effectively a bitmask type (16.3.3.3.3 [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.

Proposed resolution:

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