82b46bc412
xx args with a slice target now bridges a comptime pack to a runtime slice: []Any boxes each element to Any; []P xx-erases each to the protocol (reusing the slice-of-protocol erasure from 0052). New lowerPackToSlice; the unary-op arm intercepts xx <pack> before the pack-as-value diagnostic. This is the working forward to a runtime []Any/[]P helper -- log_count(xx args) -> 3 -- so the 2.7 pack-as-value diagnostics now suggest xx <name> for the call case. examples/204-pack-xx-to-slice.sx (both []Any and []P paths); 203 help text updated. issue 0053 FIXED. 239 examples + unit green.
33 lines
1.1 KiB
Plaintext
33 lines
1.1 KiB
Plaintext
// `xx <pack>` materializes a comptime pack into a runtime slice (issue 0053):
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// the explicit pack→slice bridge. With a `[]Any` target each element is boxed
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// to `Any`; with a `[]P` target each is `xx`-erased to the protocol `P`. This is
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// how you forward a pack to a runtime (`[]Any` / `[]P`) helper.
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#import "modules/std.sx";
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Show :: protocol { show :: () -> string; }
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A :: struct {}
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B :: struct { s: string; }
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impl Show for A { show :: (self: *A) -> string => "A"; }
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impl Show for B { show :: (self: *B) -> string => "B"; }
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count_any :: (items: []Any) -> s64 { return items.len; }
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show_all :: (items: []Show) -> s64 {
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i := 0;
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while i < items.len { print("{}\n", items[i].show()); i = i + 1; }
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return items.len;
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}
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// `..$args` pack → []Any via `xx`.
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fwd_any :: (..$args) -> s64 { return count_any(xx args); }
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// `..xs: Show` pack → []Show via `xx`.
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fwd_show :: (..xs: Show) -> s64 { return show_all(xx xs); }
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main :: () -> s32 {
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print("any={}\n", fwd_any(1, "hi", 2.5)); // 3
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print("show={}\n", fwd_show(A.{}, B.{ s = "x" }, A.{})); // A B A, 3
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0;
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}
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