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Section: 33.6 [thread.mutex] Status: C++11 Submitter: Alisdair Meredith Opened: 2009-03-12 Last modified: 2016-01-28
Priority: Not Prioritized
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Discussion:
Addresses UK 325 [CD1]
We believe constexpr literal values should be a more natural expression of empty tag types than extern objects as it should improve the compiler's ability to optimize the empty object away completely.
[ Summit: ]
Move to review. The current specification is a "hack", and the proposed specification is a better "hack".
[ Batavia (2009-05): ]
We agree with the proposed resolution. Move to Tentatively Ready.
Proposed resolution:
Change the synopsis in 33.6 [thread.mutex]:
struct defer_lock_t {};
struct try_to_lock_t {};
struct adopt_lock_t {};
extern constexpr defer_lock_t defer_lock {};
extern constexpr try_to_lock_t try_to_lock {};
extern constexpr adopt_lock_t adopt_lock {};