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d6ca87b614
Introduce the LogicValue protocol, which is used to establish when a particular type can be used as a logical value in a condition. Make Bool conform to this protocol. Rename the Builtin.i1-returning Bool.getLogicValue() to _getBuiltinLogicValue(), because this is meant to be a builtin hook for the compiler. We can add more underscores here if needed to hide this further from users. Move the implementation of _getBool() into C code. It was performing an 'if' on a Builtin.i1, which does not (and should not!) conform to the LogicValue protocol. Once more oneof IR generation comes online, we'll be able to write both this and _getBuiltinLogicValue in Swift directly. Swift SVN r5140
30 lines
558 B
Swift
30 lines
558 B
Swift
// RUN: %swift -parse %s -verify
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// Basic support for Bool
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func simpleIf(b : Bool) {
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if b { }
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}
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// Support for non-Bool logic values
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struct OtherLogicValue : LogicValue {
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func getLogicValue() -> Bool { return true }
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}
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func otherIf(b : OtherLogicValue) {
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if b { }
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}
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// Support for arbitrary logic values in generics
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func doIf<T : LogicValue>(t : T) {
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if t { }
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}
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doIf(true)
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// Using LogicValue-ness to resolve overloading.
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func getValue() -> OtherLogicValue {}
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func getValue() -> Int {}
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func testLogicValueOverloading() {
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if getValue() { }
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}
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