On Wed, 1 Nov 2023 at 09:34, Chris Gary via Std-Proposals <std-proposals@lists.isocpp.org> wrote:

Frankly, I see nothing wrong with the idea. Its really the same as "0 != c.size()" or " ! c.empty()".

With, as Arthur pointed out, the benefit of being able to instantiate something like a range in a conditional, just extended to containers:

Ex:

dlg.clearList();

if( auto resVec = dbc.submit( query ) )
{

  dlg.populateList( resVec );

}

Why wouldn't you just write if( auto resVec = dbc.submit( query ); not resVec.empty()) ?

 

On Tue, Oct 31, 2023 at 7:54 PM Arthur O'Dwyer via Std-Proposals <std-proposals@lists.isocpp.org> wrote:

https://quuxplusone.github.io/blog/2021/12/06/views-are-boolish/

On Tue, Oct 31, 2023 at 9:45 PM Hewill Kang via Std-Proposals <std-proposals@lists.isocpp.org> wrote:

Ranges adaptors *do* provide (explicit) operator bool since they all derived from ‘view_interface’.

Olaf van der Spek via Std-Proposals <std-proposals@lists.isocpp.org>於 2023年11月1日 週三，04:44寫道：

On Thu, Oct 19, 2023 at 12:06 PM Alex Rozenman via Std-Proposals
<std-proposals@lists.isocpp.org> wrote:
> In this message I would like to suggest to use of a bool casting operator as the most clean form of this function:

Nice suggestion. ;)

https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3509.htm


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