And just to be clear, if we have a purely virtual function, then it
will require an instance:
//////////////////////////////////////////////////
requires package "llvm";
open C_hack;
typeclass Value[t] {
virtual proc dump: cptr[t];
}
module Type {
requires header "#include <llvm/Type.h>";
type t = "::llvm::Type";
fun float_type : unit -> cptr[t] = "::llvm::Type::FloatTy";
instance Value[t] {
proc dump: cptr[t] = "$1->dump();";
}
}
Value::dump $ Type::float_type ();
fun foo: unit -> C_hack::cptr[int] = "0";
Value::dump $ foo ();
//////////////////////////////////////////////////
Errors out with:
Other exn = Flx_exceptions.Free_fixpoint(_)
CLIENT ERROR
Instantiate virtual procedure(1) dump
In ./foo.flx: line 6, cols 3 to 29
5: typeclass Value[t] {
6: virtual proc dump: cptr[t];
***************************
7: }
See also ./foo.flx: line 6, cols 3 to 29
5: typeclass Value[t] {
6: virtual proc dump: cptr[t];
***************************
7: }
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