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### 1427. `unordered_map` constructor accepting an allocator as a single parameter should be explicit

Section: 24.5.4 [unord.map] Status: C++11 Submitter: Japan Opened: 2010-08-25 Last modified: 2016-01-28

Priority: Not Prioritized

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Discussion:

Addresses JP-10

Constructor accepting an allocator as a single parameter should be qualified as explicit.

[ Resolved in Rapperswil by a motion to directly apply the words from the ballot comment in N3102. ]

Proposed resolution:

Add explicit.

    namespace std {
    template <class Key,
    template <class Key,
    class T,
    class Hash = hash<Key>,
    class Pred = std::equal_to<Key>,
    class Alloc = std::allocator<std::pair<const Key,
    T> > >
    class unordered_map
    {
    public:
    ...
    explicit unordered_map(const Allocator&);