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carbon-lang/toolchain/lower/testdata/interop/cpp/enum.carbon
T
Jon Ross-Perkins 64e3fab43a Skip C++ types when generating Destroy witnesses (#6732)
This TODO had been written before C++ types were generating destroy
implementations, which is resolved now.

Assisted-by: Google Antigravity with Gemini 3 Flash
2026-02-14 00:43:11 +00:00

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// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
// Exceptions. See /LICENSE for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
// INCLUDE-FILE: toolchain/testing/testdata/min_prelude/full.carbon
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/lower/testdata/interop/cpp/enum.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/lower/testdata/interop/cpp/enum.carbon
// --- enum_member.h
struct C {
enum E : short {
a,
b = 7,
c
};
static void F(E);
};
// --- fail_todo_pass_as_arg.carbon
library "[[@TEST_NAME]]";
import Cpp library "enum_member.h";
fn Pass() {
Cpp.C.F(Cpp.C.a);
Cpp.C.F(Cpp.C.a);
Cpp.C.F(Cpp.C.b);
Cpp.C.F(Cpp.C.c);
Cpp.C.F(Cpp.C.E.a);
Cpp.C.F(Cpp.C.E.b);
// CHECK:STDERR: fail_todo_pass_as_arg.carbon:[[@LINE+28]]:11: error: cannot access member of interface `Core.Destroy` in type `Cpp.E` that does not implement that interface [MissingImplInMemberAccess]
// CHECK:STDERR: Cpp.C.F(Cpp.C.E.c);
// CHECK:STDERR: ^~~~~~~~~
// CHECK:STDERR:
// CHECK:STDERR: fail_todo_pass_as_arg.carbon:[[@LINE-5]]:11: error: cannot access member of interface `Core.Destroy` in type `Cpp.E` that does not implement that interface [MissingImplInMemberAccess]
// CHECK:STDERR: Cpp.C.F(Cpp.C.E.b);
// CHECK:STDERR: ^~~~~~~~~
// CHECK:STDERR:
// CHECK:STDERR: fail_todo_pass_as_arg.carbon:[[@LINE-10]]:11: error: cannot access member of interface `Core.Destroy` in type `Cpp.E` that does not implement that interface [MissingImplInMemberAccess]
// CHECK:STDERR: Cpp.C.F(Cpp.C.E.a);
// CHECK:STDERR: ^~~~~~~~~
// CHECK:STDERR:
// CHECK:STDERR: fail_todo_pass_as_arg.carbon:[[@LINE-15]]:11: error: cannot access member of interface `Core.Destroy` in type `Cpp.E` that does not implement that interface [MissingImplInMemberAccess]
// CHECK:STDERR: Cpp.C.F(Cpp.C.c);
// CHECK:STDERR: ^~~~~~~
// CHECK:STDERR:
// CHECK:STDERR: fail_todo_pass_as_arg.carbon:[[@LINE-20]]:11: error: cannot access member of interface `Core.Destroy` in type `Cpp.E` that does not implement that interface [MissingImplInMemberAccess]
// CHECK:STDERR: Cpp.C.F(Cpp.C.b);
// CHECK:STDERR: ^~~~~~~
// CHECK:STDERR:
// CHECK:STDERR: fail_todo_pass_as_arg.carbon:[[@LINE-25]]:11: error: cannot access member of interface `Core.Destroy` in type `Cpp.E` that does not implement that interface [MissingImplInMemberAccess]
// CHECK:STDERR: Cpp.C.F(Cpp.C.a);
// CHECK:STDERR: ^~~~~~~
// CHECK:STDERR:
// CHECK:STDERR: fail_todo_pass_as_arg.carbon:[[@LINE-30]]:11: error: cannot access member of interface `Core.Destroy` in type `Cpp.E` that does not implement that interface [MissingImplInMemberAccess]
// CHECK:STDERR: Cpp.C.F(Cpp.C.a);
// CHECK:STDERR: ^~~~~~~
// CHECK:STDERR:
Cpp.C.F(Cpp.C.E.c);
}
// --- fail_todo_convert.carbon
library "[[@TEST_NAME]]";
import Cpp library "enum_member.h";
fn TakeI16(n: i16);
fn PassEnum() {
TakeI16(Cpp.C.b as i16);
}
fn ConvertEnumToI16(e: Cpp.C.E) {
TakeI16(e as i16);
}
fn ConvertI16ToEnum(n: i16) {
// CHECK:STDERR: fail_todo_convert.carbon:[[@LINE+4]]:11: error: cannot access member of interface `Core.Destroy` in type `Cpp.E` that does not implement that interface [MissingImplInMemberAccess]
// CHECK:STDERR: Cpp.C.F(n as Cpp.C.E);
// CHECK:STDERR: ^~~~~~~~~~~~
// CHECK:STDERR:
Cpp.C.F(n as Cpp.C.E);
}
// --- bitmask.h
enum Bits {
A = 1 << 0,
B = 1 << 1,
C = 1 << 2,
};
void Take(Bits b);
// --- use_bitmask.carbon
library "[[@TEST_NAME]]";
import Cpp library "bitmask.h";
// TODO: Once we support interop with C++-defined operators, we should be able
// to use `|` below rather than declaring our own builtin.
fn BitOr(a: Cpp.Bits, b: Cpp.Bits) -> Cpp.Bits = "int.or";
fn Call() {
Cpp.Take(BitOr(Cpp.A, Cpp.C));
}