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When importing a C++ class template instantiation, Swift translates the template parameter type names from C++ into their Swift equivalent. For instance, `basic_string<wchar_t, char_traits<wchar_t>, allocator<wchar_t>>` gets imported as `basic_string<Scalar, char_traits<Scalar>, allocator<Scalar>>`: `wchar_t` is imported as `CWideChar`, which is a typealias for `Scalar` on most platforms including Darwin. Notice that Swift goes through the `CWideChar` typealias on the specific platform. Another instantiation `basic_string<uint32_t, char_traits<uint32_t>, allocator<uint32_t>>` also gets imported as `basic_string<Scalar, char_traits<Scalar>, allocator<Scalar>>`: `uint32_t` is also imported as `Scalar`. This is problematic because we have two distinct C++ types that have the same name in Swift. This change makes sure Swift doesn't go through typealiases when emitting names of template parameters, so `wchar_t` would now get printed as `CWideChar`, `int` would get printed as `CInt`, etc. This also encourages clients to use the correct type (`CInt`, `CWideChar`, etc) instead of relying on platform-specific typealiases. rdar://115673622
22 lines
1.1 KiB
Swift
22 lines
1.1 KiB
Swift
// RUN: %target-swift-ide-test -print-module -module-to-print=TemplatesWithForwardDecl -I %S/Inputs -source-filename=x -enable-experimental-cxx-interop | %FileCheck %s
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// CHECK: enum NS1 {
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// CHECK-NEXT: struct ForwardDeclared<CInt> {
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// CHECK-NEXT: init()
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// CHECK-NEXT: }
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// CHECK-NEXT: @available(*, unavailable, message: "Un-specialized class templates are not currently supported. Please use a specialization of this type.")
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// CHECK-NEXT: struct ForwardDeclared<T> {
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// CHECK-NEXT: }
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// CHECK-NEXT: struct Decl<CInt> {
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// CHECK-NEXT: init()
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// CHECK-NEXT: init(fwd: NS1.ForwardDeclared<CInt>)
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// CHECK-NEXT: typealias MyInt = Int32
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// CHECK-NEXT: var fwd: NS1.ForwardDeclared<CInt>
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// CHECK-NEXT: static let intValue: NS1.Decl<CInt>.MyInt
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// CHECK-NEXT: }
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// CHECK-NEXT: @available(*, unavailable, message: "Un-specialized class templates are not currently supported. Please use a specialization of this type.")
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// CHECK-NEXT: struct Decl<T> {
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// CHECK-NEXT: }
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// CHECK-NEXT: typealias di = NS1.Decl<CInt>
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// CHECK-NEXT: }
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