On Saturday, 4 November 2023 at 11:18:02 UTC, Dadoum wrote:
On Saturday, 4 November 2023 at 10:08:20 UTC, Imperatorn wrote:
On Saturday, 4 November 2023 at 03:00:49 UTC, Dadoum wrote:
I was wondering why C++ linkage forbids strings as arguments
while we can with the C one.
With C linkage, it's translated to a template that's defined
in the automatically generated header, but it just doesn't
compile in C++.
Can you provide an example of exactly what you want to do?
```d
extern (C) void hello(string arg) {
import std.stdio;
writeln(arg);
}
```
Compiles fine with dmd, ldc2 and gdc.
```d
extern (C++) void hello(string arg) {
import std.stdio;
writeln(arg);
}
```
Doesn't compile.
DMD: `Internal Compiler Error: type `string` cannot be mapped
to C++`
GDC and LDC2: `function 'example.hello' cannot have parameter
of type 'string' because its linkage is 'extern(C++)'`
And I am wondering why the type can be mapped to a template in
C but not in C++. (you can see the template used when you
compile with `-H --HCf=./header.h`
We can just assume what you're doing on the C++-side. Are you
using std::string?
You could try as a pointer + length and it might work, but
without seeing your complete code it's quite hard to know what
you want to do.
