explicit only when necessary?Section: 23 [containers] Status: LEWG Submitter: Zhihao Yuan Opened: 2013-09-26 Last modified: 2018-11-12
Priority: 2
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Discussion:
LWG 2193 yields explicit for default ctors to allow {}, but not for
all cases of uniform initialization. For example:
explicit vector(size_type count, const Allocator& alloc = Allocator());
This prevents {n, alloc()}. Although this use is relatively rare,
but the behavior is inconsistent with that of
vector(size_type count, const T& value, const Allocator& alloc = Allocator());
[Urbana 2014-11-07: Move to Open]
[2018-08 Batavia Monday issue discussion]
This really needs a paper; splitting a lot of constructors. Nevin to write paper.
[2018-11 San Diego Thursday night issue processing]
LEWG has rejected Nevin's paper, so they need to formulate a policy.
Proposed resolution: