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Add initial support for importing C++ constexprs as Carbon constants (#6770)

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This allows a C++ constexpr to be used as an argument to a non-type
template parameter.

https://github.com/carbon-language/carbon-lang/issues/6717
This commit is contained in:
Nicholas Bishop
2026-02-24 20:59:24 +00:00
committed by GitHub
parent 1a3f762dba
commit f210f4ab04
7 changed files with 150 additions and 6 deletions
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toolchain/check/testdata/interop/cpp/constexpr.carbon
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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/check/testdata/interop/cpp/constexpr.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/interop/cpp/constexpr.carbon
// --- bool.carbon
library "[[@TEST_NAME]]";
import Cpp inline '''
constexpr bool b = true;
''';
class C(B:! bool) {}
fn F() -> C(Cpp.b);
let x: C(true) = F();
// --- int.carbon
library "[[@TEST_NAME]]";
import Cpp inline '''
constexpr int i = 123;
''';
class C(I:! i32) {}
fn F() -> C(Cpp.i);
let x: C(123) = F();