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teaches arithmetic interfaces about C++ operators (#7123)

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Christopher Di Bella
2026-04-28 01:00:21 +00:00
committed by GitHub
parent aa8f9d8c00
commit 9480c10ecf
11 changed files with 4160 additions and 45 deletions
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toolchain/check/testdata/interop/cpp/operators/arithmetic_operators.carbon
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toolchain/check/testdata/interop/cpp/operators/operators.carbon
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@@ -822,35 +822,6 @@ fn F() {
//@dump-sem-ir-end
}
// ============================================================================
// Satisfying constraints
// ============================================================================
// --- fail_todo_constraints.carbon
library "[[@TEST_NAME]]";
import Cpp inline '''
class X {};
X operator+(X, X);
''';
// TODO: Use Core.Add() when it is available.
// TODO: `Sum()` should be declared this way when generics implementation is ready for that:
// fn Sum[T:! Core.AddWith(.Self) where .Result = .Self](a: T, b: T) -> T
fn Sum[U:! type, T:! Core.AddWith(U) where .Result = U](a: T, b: U) -> U {
return a + b;
}
fn Call(x: Cpp.X) -> Cpp.X {
// CHECK:STDERR: fail_todo_constraints.carbon:[[@LINE+7]]:10: error: cannot convert type `Cpp.X` into type implementing `Core.AddWith(Cpp.X) where .(Core.AddWith(Cpp.X).Result) = Cpp.X` [ConversionFailureTypeToFacet]
// CHECK:STDERR: return Sum(x, x);
// CHECK:STDERR: ^~~~~~~~~
// CHECK:STDERR: fail_todo_constraints.carbon:[[@LINE-7]]:1: note: while deducing parameters of generic declared here [DeductionGenericHere]
// CHECK:STDERR: fn Sum[U:! type, T:! Core.AddWith(U) where .Result = U](a: T, b: U) -> U {
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
return Sum(x, x);
}
// ============================================================================
// Operator not found