Non-restoring logic are a class of logic families that consist of passive switching devices that cannot amplify but instead dissipates power - i.e. producing outputs that has not been restored or regenerated. This king of logic may be because the specific transistor topology relies on logic that gets passed from input directly to output such as in the case of transmission gates. It may also simply be because of the nature of the technology such as in the case of diode logic. The opposite of this type of logic is fully-restoring logic.