BufType

fn BufType(comptime T: type, comptime min_len: usize) type {
    return std.meta.Int(.unsigned, @max(min_len, @bitSizeOf(switch (@typeInfo(T)) {
        .comptime_int => u32,
        .int => |info| if (info.signedness == .unsigned)
            T
        else
            @compileError("Unsupported type: " ++ @typeName(T)),
        .@"enum" => |info| info.tag_type,
        .bool => u1,
        .@"struct" => |info| switch (info.layout) {
            .auto, .@"extern" => @compileError("Unsupported type: " ++ @typeName(T)),
            .@"packed" => std.meta.Int(.unsigned, @bitSizeOf(T)),
        },
        else => @compileError("Unsupported type: " ++ @typeName(T)),
    })));
}