[llvm-bugs] [Bug 26285] New: __hash_value_type allows accidental implicit construction in unordered_map

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=26285

            Bug ID: 26285
           Summary: __hash_value_type allows accidental implicit
                    construction in unordered_map
           Product: libc++
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: eric at efcs.ca
                CC: llvm-bugs at lists.llvm.org, mclow.lists at gmail.com
    Classification: Unclassified

The C++11 __hash_value_type has a non-explicit converting constructor that
accepts anything. This can lead to accidental constructions of
__hash_value_type from "pair<const Key, value>".

The constructor must be made explicit.

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