dimgigov
cf074bec89
- Generate tagged unions in C backend for enums with data
- Add HirEnumVariant type with fields and namedFields
- Support _Tag and _Data field access in sema
- Support enum variant constants (Result_Ok, Result_Err)
- Support _Data union field access (Ok_0, Err_0, etc.)
- Add algebraic_enums.bux example
Example:
enum Result {
Ok(int),
Err(String)
}
let r: Result = Result { tag: Result_Ok };
r.data.Ok_0 = 42;
30 lines
652 B
Plaintext
30 lines
652 B
Plaintext
// Algebraic Enums - Enums with data (tagged unions)
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extern func Std_Io_PrintLine(s: String);
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extern func Std_Io_PrintInt(n: int);
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enum Result {
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Ok(int),
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Err(String)
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}
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func Main() -> int {
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let r1: Result = Result { tag: Result_Ok };
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r1.data.Ok_0 = 42;
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let r2: Result = Result { tag: Result_Err };
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r2.data.Err_0 = "error message";
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if r1.tag == Result_Ok {
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Std_Io_PrintLine("r1 is Ok:");
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Std_Io_PrintInt(r1.data.Ok_0);
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Std_Io_PrintLine("");
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}
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if r2.tag == Result_Err {
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Std_Io_PrintLine("r2 is Err:");
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Std_Io_PrintLine(r2.data.Err_0);
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}
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return 0;
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}
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