EnumFieldStruct

Returns a struct with a field matching each unique named enum element. If the enum is extern and has multiple names for the same value, only the first name is used. Each field is of type Data and has the provided default, which may be undefined.

Source

Implementation

pub fn EnumFieldStruct(comptime E: type, comptime Data: type, comptime field_default: ?Data) type {
    @setEvalBranchQuota(@typeInfo(E).@"enum".fields.len + eval_branch_quota_cushion);
    var struct_fields: [@typeInfo(E).@"enum".fields.len]std.builtin.Type.StructField = undefined;
    for (&struct_fields, @typeInfo(E).@"enum".fields) |*struct_field, enum_field| {
        struct_field.* = .{
            .name = enum_field.name,
            .type = Data,
            .default_value_ptr = if (field_default) |d| @as(?*const anyopaque, @ptrCast(&d)) else null,
            .is_comptime = false,
            .alignment = if (@sizeOf(Data) > 0) @alignOf(Data) else 0,
        };
    }
    return @Type(.{ .@"struct" = .{
        .layout = .auto,
        .fields = &struct_fields,
        .decls = &.{},
        .is_tuple = false,
    } });
}