Re: How to pass a class by (const) reference to C++

[Tim via Digitalmars-d-learn]

On Thursday, 16 December 2021 at 08:30:14 UTC, Jan wrote:
Ok, next problem. Maybe you know the necessary syntax for this 
one too.


C++
```cpp
class Test
{
public:
  __declspec(dllexport) static const int const_vars[2];
  __declspec(dllexport) static int nonconst_vars[2];
};

const int Test::const_vars[2] = {11, 23};
int Test::nonconst_vars[2] = {12, 24};
```

D
```cpp
extern(C++, class) struct Test
{
    extern export static __gshared const(int)[2] const_vars;
    extern export static __gshared int[2] nonconst_vars;
}
```

I get the nonconst_vars to link correctly, but for the 
const_vars the mangled name contains one less const than what 
MSVC generates, so I assume I have to wrap this somehow 
differently. I tried "const(int[2])" but that didn't make a 
difference.

D wants to link against:
`?const_vars@Test@@2PAHB`

which is:
`public: static int * const Test::const_vars" ()`

MSVC exports:
`?const_vars@Test@@2QBHB`

which is:
`public: static int const * const Test::const_vars`


Any idea?

That looks like another bug in the compiler. pragma(mangle, ...) 
should work as a workaround.