[cfe-dev] [libc++] Why doesn't libc++ define std::vector<bool>::const_reference as bool?

[Hubert Tong via cfe-dev]

On Tue, Nov 14, 2017 at 6:13 PM, Eric Fiselier via cfe-dev <
cfe-dev at lists.llvm.org> wrote:

> Unless I'm mis-reading the spec, `vector<bool>::const_reference` is
> implementation defined. Not bool. See [vector.bool]
> <http://eel.is/c++draft/vector.bool>.
>
It says:

using const_reference        = bool;




>
> /Eric
>
> On Tue, Nov 14, 2017 at 6:39 AM, Mikhail Maltsev via cfe-dev <
> cfe-dev at lists.llvm.org> wrote:
>
>> Hi. According to the C++ Standard (section [vector.bool]),
>> std::vector<bool>::const_reference should be defined as bool. libc++
>> defines it as std::__1::__bit_const_reference<std::__1::vector<bool,
>> std::__1::allocator<bool>>>]. Is this divergence from the standard
>> intentional? If it is, what is the purpose?
>>
>> --
>> Regards,
>>    Mikhail Maltsev
>>
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