| NullableReadOnlySpanPairTFirst, TSecond(ReadOnlySpanPairTFirst, TSecond) | Initializes a new instance of the NullableReadOnlySpanPairTFirst, TSecond structure. |
| NullableReadOnlySpanPairTFirst, TSecond(ReadOnlySpanTFirst, ReadOnlySpanTSecond) | Initializes a new instance of the NullableReadOnlySpanPairTFirst, TSecond structure using the specified values. |