On Sunday, 29 December 2013 at 22:01:19 UTC, Dicebot wrote:
Does this look clean enough? (Not sure I have completely
understood the question)
/* export extern(C) int f( uint argc, A* argv) { return
Wrapper!f(
argc, argv); } */
struct A {}
int Wrapper(alias func, T...)(T args) { return 42; }
template ExternC(alias existingFunc)
{
import std.string : format;
import std.traits : ReturnType;
static assert(is(typeof(&existingFunc) : int function(uint,
A*)));
mixin(format(
"export extern(C) int %s(uint argc, A* argv) { return
Wrapper!(%s)(argc, argv); }",
__traits(identifier, existingFunc),
__traits(identifier, existingFunc)
));
}
// to avoid name clash, assuming you have different module in
real code
struct X
{
static int fff(uint, A*)
{
return 42;
}
}
mixin ExternC!(X.fff);
pragma(msg, typeof(fff));
// extern (C) int(uint argc, A* argv)
void main()
{
}
Very nice. Only one problem: when I use dmd/win32 to build the
DLL, and analyze the resulting export, it's
_D5mixin43__T7ExternCS28_D5mixin1X3fffFkPS5mixin1AZiZ3fffUkPS5mixin1AZi
and not _fff or similar. So somehow the extern(C) hasn't led to a
C symbol.
