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2307. Should the Standard Library use explicit only when necessary?

Section: 21 [containers] Status: Open Submitter: Zhihao Yuan Opened: 2013-09-26 Last modified: 2017-02-03

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]

Proposed resolution: