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Since this is a C++ stdlib type we need make sure that any overloads that use it are preferred over custom types that also conform to `ExpressibleByStringLiteral` when argument is a string literal. This is important for operators like `==` which could be heterogenous and have a custom C++ type that conforms to `ExpressibleByStringLiteral` on either side together with `std.string` i.e. `==(std.string, const CustomString &)`, such overloads should only be selected if argument passed to `CustomString` is non-literal because literals are convered by a stdlib `==(std.string, std.string)` overload.
23 lines
876 B
Swift
23 lines
876 B
Swift
// RUN: %target-swift-emit-silgen -verify -I %S/Inputs -cxx-interoperability-mode=upcoming-swift %s | %FileCheck %s
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import CxxStdlib
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import StdString
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extension StringBox: @retroactive ExpressibleByStringLiteral {
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public init(stringLiteral value: String) {
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self.value = std.string(value)
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}
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}
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// CHECK-LABEL: sil hidden [ossa] @$s4main4testyyF
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// CHECK: // function_ref static std{{.*}}basic_string<CChar, std{{.*}}char_traits<CChar>, std{{.*}}allocator<CChar>>.== infix(_:_:)
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// CHECK: // function_ref static std{{.*}}basic_string<CChar, std{{.*}}char_traits<CChar>, std{{.*}}allocator<CChar>>.== infix(_:_:)
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// CHECK: // function_ref static String.== infix(_:_:)
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// CHECK: } // end sil function '$s4main4testyyF'
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func test() {
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let cxxString: std.string = ""
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let _ = cxxString == "def" // Ok
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let _ = "def" == cxxString // Ok
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let _ = "def" == "hello" // Ok
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}
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