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Add initial support for exporting generic classes (#7595)

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Currently only fields of generic classes are exported; methods of
generic classes are not supported yet.

Simple example:

```carbon
class C(T: type) {
  var t: T;
}

inline Cpp '''
void F() {
  Carbon::C<int> c;
  c.t = 123;

  Carbon::C<float> c2;
  c2.t = 124.5;
}
''';
```
This commit is contained in:
Nicholas Bishop
2026-08-10 17:47:45 +00:00
committed by GitHub
parent 700e42a195
commit de1cd701cf
6 changed files with 496 additions and 134 deletions
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toolchain/check/testdata/interop/cpp/function/export/constructor.carbon
Vendored
+10 -11
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@@ -149,6 +149,10 @@ library "[[@TEST_NAME]]";
import Cpp;
class GenericClass(T: type) {
// CHECK:STDERR: fail_todo_call_generic_class_constructor.carbon:[[@LINE+4]]:3: error: semantics TODO: `non-class non-namespace name scope` [SemanticsTodo]
// CHECK:STDERR: fn GenericClass(_: T) -> Self {
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
fn GenericClass(_: T) -> Self {
return {};
}
@@ -156,17 +160,12 @@ class GenericClass(T: type) {
inline Cpp '''
void f() {
// CHECK:STDERR: fail_todo_call_generic_class_constructor.carbon:[[@LINE+12]]:11: error: no member named 'GenericClass' in namespace 'Carbon' [CppInteropParseError]
// CHECK:STDERR: 25 | Carbon::GenericClass<int> c(0);
// CHECK:STDERR: | ^~~~~~~~~~~~
// CHECK:STDERR:
// CHECK:STDERR: fail_todo_call_generic_class_constructor.carbon:[[@LINE+8]]:27: error: expected '(' for function-style cast or type construction [CppInteropParseError]
// CHECK:STDERR: 25 | Carbon::GenericClass<int> c(0);
// CHECK:STDERR: | ~~~^
// CHECK:STDERR:
// CHECK:STDERR: fail_todo_call_generic_class_constructor.carbon:[[@LINE+4]]:29: error: use of undeclared identifier 'c' [CppInteropParseError]
// CHECK:STDERR: 25 | Carbon::GenericClass<int> c(0);
// CHECK:STDERR: | ^
// CHECK:STDERR: fail_todo_call_generic_class_constructor.carbon:[[@LINE+7]]:29: error: no matching constructor for initialization of 'Carbon::GenericClass<int>' [CppInteropParseError]
// CHECK:STDERR: 24 | Carbon::GenericClass<int> c(0);
// CHECK:STDERR: | ^ ~
// CHECK:STDERR: note: candidate constructor (the implicit copy constructor) not viable: no known conversion from 'int' to 'const GenericClass<int>' for 1st argument [CppInteropParseNote]
// CHECK:STDERR: note: candidate constructor (the implicit move constructor) not viable: no known conversion from 'int' to 'GenericClass<int>' for 1st argument [CppInteropParseNote]
// CHECK:STDERR: note: candidate constructor (the implicit default constructor) not viable: requires 0 arguments, but 1 was provided [CppInteropParseNote]
// CHECK:STDERR:
Carbon::GenericClass<int> c(0);
}