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https://github.com/carbon-language/carbon-lang.git
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Richard Smith
9ae73d2847
When a Carbon virtual function overrides a C++ virtual function, we need to export it with the C++ signature in order for it to work as an override. Instead of mapping the C++ signature into Carbon and then back again, use the original C++ signature from the base class as the signature exported to C++. Also add documentation explaining how we use thunks in C++ interop, including in this new virtual function handling logic.
33 lines
907 B
Plaintext
33 lines
907 B
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/destroy.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/class/export/override.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/class/export/override.carbon
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// --- const_ref_param.carbon
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library "[[@TEST_NAME]]";
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import Cpp;
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inline Cpp '''
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struct X {};
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struct A {
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virtual void f(const X& x) = 0;
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};
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''';
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class B {
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extend base: Cpp.A;
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override fn f(unused self, unused x: Cpp.X) {}
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}
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inline Cpp '''
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Carbon::B b;
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''';
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