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https://github.com/carbon-language/carbon-lang.git
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Richard Smith
0678501038
Following #6357, map C++ `void` to a prelude class type `Core.CppCompat.VoidBase`, not to a builtin type. This is mostly just moving logic around, but does notably change `Cpp.void` from being an incomplete type to being a complete-but-abstract type. Also change `NullptrT` to be an adapter for `void*` instead of `()*`, to follow the approved design. Implicit conversions to `void` and to `void*` are still absent. Part of #6280.
67 lines
2.5 KiB
Plaintext
67 lines
2.5 KiB
Plaintext
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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// INCLUDE-FILE: toolchain/testing/testdata/min_prelude/full.carbon
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//
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// AUTOUPDATE
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// TIP: To test this file alone, run:
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// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/interop/cpp/void.carbon
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// TIP: To dump output, run:
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// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/interop/cpp/void.carbon
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// --- void_not_incomplete.carbon
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library "[[@TEST_NAME]]";
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import Cpp;
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// This is valid, unlike in C++, because `Cpp.void` is complete but abstract in
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// Carbon. Values of type `Cpp.void` exist, but objects of that type do not.
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fn F(x: Cpp.void) {}
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// --- fail_void_abstract.carbon
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library "[[@TEST_NAME]]";
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import Cpp;
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fn G() {
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// CHECK:STDERR: fail_void_abstract.carbon:[[@LINE+7]]:10: error: binding pattern has abstract type `Cpp.void` in `var` pattern [AbstractTypeInVarPattern]
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// CHECK:STDERR: var x: Cpp.void;
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// CHECK:STDERR: ^~~~~~~~
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// CHECK:STDERR: {{.*}}/prelude/types/cpp/void.carbon:22:1: note: class was declared abstract here [ClassAbstractHere]
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// CHECK:STDERR: abstract class CppCompat.VoidBase {
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// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// CHECK:STDERR:
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var x: Cpp.void;
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}
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// --- fail_void_argument.carbon
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library "[[@TEST_NAME]]";
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import Cpp inline "void F(int);";
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fn G(v: Cpp.void) {
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// CHECK:STDERR: fail_void_argument.carbon:[[@LINE+7]]:10: error: no matching function for call to 'F' [CppInteropParseError]
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// CHECK:STDERR: 14 | Cpp.F(v);
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// CHECK:STDERR: | ^
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// CHECK:STDERR: fail_void_argument.carbon:[[@LINE-6]]:6: note: candidate function not viable: cannot convert argument of incomplete type 'void' to 'int' for 1st argument [CppInteropParseNote]
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// CHECK:STDERR: 4 | void F(int);
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// CHECK:STDERR: | ^ ~~~
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// CHECK:STDERR:
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Cpp.F(v);
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}
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fn H(p: Cpp.void*) {
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// CHECK:STDERR: fail_void_argument.carbon:[[@LINE+7]]:11: error: no matching function for call to 'F' [CppInteropParseError]
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// CHECK:STDERR: 25 | Cpp.F(*p);
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// CHECK:STDERR: | ^
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// CHECK:STDERR: fail_void_argument.carbon:[[@LINE-17]]:6: note: candidate function not viable: cannot convert argument of incomplete type 'void' to 'int' for 1st argument [CppInteropParseNote]
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// CHECK:STDERR: 4 | void F(int);
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// CHECK:STDERR: | ^ ~~~
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// CHECK:STDERR:
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Cpp.F(*p);
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}
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