From: Andrey Semashev (andrey.semashev_at_[hidden])
Date: 2020-09-08 21:11:51
On 2020-09-08 22:31, Peter Dimov via Boost wrote:
> Andrey Semashev wrote:
>
>> Looking at the code, I wonder why there is "using namespace
>> std::placeholders". Shouldn't there be a separate namespace for
>> placeholders? (I also think, it goes against our header policies.)
>
> This imports the placeholders into boost::lambda2. There is no scenario
> in which you want to make the operators available without the
> placeholders, so without this directive, you'd always need to use both
>
> Â Â using namespace boost::lambda2;
> Â Â using namespace std::placeholders;
>
> This doesn't help anyone.
I see. I was thinking one could use it to compose std::mem_fns or native
C++ lambdas without placeholders, but apparently this is not allowed.
I noticed a few missing operators: unary +, ++, --, <<, >>, <=>, =,
<op>=. Also, unary &, but I'm not sure it's a good idea to add one. I
realize that there are no functional objects for those, but the library
could define them. Do you plan to add them?