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Prevent failure with empty struct in std.meta.DeclEnum

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This commit is contained in:
Bob Farrell 2024-09-07 15:20:55 +01:00
parent 5f3d9e0b7a
commit 7d3e0f815d
1 changed files with 4 additions and 1 deletions
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5
lib/std/meta.zig
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@ -628,7 +628,7 @@ pub fn DeclEnum(comptime T: type) type {
}
return @Type(.{
.@"enum" = .{
.tag_type = std.math.IntFittingRange(0, fieldInfos.len - 1),
.tag_type = std.math.IntFittingRange(0, if (fieldInfos.len == 0) 0 else fieldInfos.len - 1),
.fields = &enumDecls,
.decls = &decls,
.is_exhaustive = true,
@ -654,9 +654,12 @@ test DeclEnum {
pub const b: void = {};
pub const c: f32 = 0;
};
const D = struct {};
try expectEqualEnum(enum { a }, DeclEnum(A));
try expectEqualEnum(enum { a, b, c }, DeclEnum(B));
try expectEqualEnum(enum { a, b, c }, DeclEnum(C));
try expectEqualEnum(enum {}, DeclEnum(D));
}
pub fn Tag(comptime T: type) type {