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std.meta: make globalOption comptime-only and update its docs #17267

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wrongnull wants to merge 4 commits into from
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std.meta: make globalOption comptime-only and update its docs #17267

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4fad841
std.meta: make globalOption comptime-only and update its docs
wrongnull Sep 24, 2023
209634f
fix typo
wrongnull Sep 24, 2023
850f82c
rewrite to block structure
wrongnull Sep 24, 2023
82ff96e
missing semicolon
wrongnull Sep 24, 2023
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11 changes: 7 additions & 4 deletions lib/std/meta.zig
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Original file line number Diff line number Diff line change
Expand Up @@ -1091,11 +1091,14 @@ test "ArgsTuple forwarding" {
}
}

/// TODO: https://github.com/ziglang/zig/issues/425
/// Returns the optional value of the declaration `name` in the root source file, casts it to type `T`.
/// This function should only be called at compile time.
pub fn globalOption(comptime name: []const u8, comptime T: type) ?T {
if (!@hasDecl(root, name))
return null;
return @as(T, @field(root, name));
return comptime blk: {
if (!@hasDecl(root, name))
break :blk null;
break :blk @as(T, @field(root, name));
};
}

/// Returns whether `error_union` contains an error.
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