A comparison between C++ and D

[Ola Fosheim Grøstad via Digitalmars-d]

On Wednesday, 9 March 2016 at 18:26:01 UTC, bigsandwich wrote:
> Is this really true?  Couldn't the closure be stored internally 
> somewhere like std::function<> does in C++?

Lambdas in C++ creates a regular class with a call-operator, the 
class is instantiated and the fields filled with the "captured" 
variables. Isn't std::function<> just for supporting passing of 
lambdas etc when using separate compilation? I've never used it 
since I assume it is very slow. I always use function objects 
with a templated type in C++.

But I believe D is pointing to the activation record (stack 
frame) and not the individual variables. So I don't think D can 
capturing anything by value. Or is this wrong?