question about call cpp class constructer without new , and define cpp delegate

[Rémy Mouëza]

On Thursday, 27 June 2019 at 05:57:49 UTC, evilrat wrote:
> On Thursday, 27 June 2019 at 05:37:08 UTC, ChangLoong wrote:
>> If I want call cpp class constructer without new method, is 
>> there a way to do that ?
>
> If what you really want is to actually allocate using C++ new 
> operator from D, then that is very problematic and not portable 
> even across compilers on same OS.
>
> If C++ side has poor design around this specific issue and 
> expects passed object to be delete'd (using the C++ delete 
> operator) later then you are in trouble. In that case you have 
> to make simple wrapper on C++ side to be able to call 
> new/delete from D.

I though support for C++ allocation had improved. In a recent 
release, there was the addition of core.stdcpp.new, but I didn't 
try it out:
- http://dpldocs.info/experimental-docs/core.stdcpp.new_.html
- https://en.cppreference.com/w/cpp/memory/new/operator_new

Are there still pitfalls to be wary of?