On Thursday, 24 December 2020 at 08:36:54 UTC, RSY wrote:
On Wednesday, 23 December 2020 at 19:00:14 UTC, evilrat wrote:
On Wednesday, 23 December 2020 at 18:03:56 UTC, frame wrote:
It's not the problem mentioned but I had to struggle with
DLLs and D's Variant-type. The problem is that Variant uses
TypeInfo which does not pass DLL boundaries correctly so that
int != int in runtime even it's in fact a simple int.
If you need to exchange unknown data between a DLL and your
application you need to get a workaround and cannot use that
elsewhere settled nice feature. But it's a Windows specific
issue - it works as expected on other systems.
Which is basically same as in C++, despite the fact it does
have real working SO/DLL runtime's many large projects have
their own RTTI implementation. LLVM has its own RTTI because
standard type info is "inefficient", Unreal Engine has its
own, IIRC Qt too has its own, etc...
Same thing with D Variant, some people say it is
"inefficient"... so we ended up having multiple libraries.
Not saying anything about how good or bad all this, just the
facts.
C++ you need to write duplicate code (.h and .cpp)
C++ you need to care about header include order
C++ you need to forward declare everything you gonna use if it
is not included before
C++ you need to waste time waiting for compile
Fixed with C++20 modules.
I am already playing with the experimental support on VC++.
C++ you need to fight to get proper reflection
Coming in C++23, and partially available already with a mix of
type traits and constexpr.
I am all good for D vs C++, but one needs to update their
knowledge specially when the audience is up to date with latest
ISO C++'s capabilities.
