If a precondition is violated, the effect of the section of code becomes undefined and thus may or may not carry out its intended work. Security problems can arise due to incorrect preconditions.
Often, preconditions are simply included in the documentation of the affected section of code. Preconditions are sometimes tested using assertions within the code itself, and some languages have specific syntactic constructions for doing so.
For example: the factorial is only defined for integers greater than or equal to zero. So a program that calculates the factorial of an input number would have preconditions that the number be an integer and that it be greater than or equal to zero.
February 24, 2021 Preconditions for a general-purpose central bank digital currency ... This paper aims to identify some high-level environmental preconditions that support a general-purpose CBDC in the United States. These preconditions are necessary, though not sufficient, and can be broadly grouped into five areas.
The JoeBiden administration said it’s willing to sit down with Iran to discuss renewing the 2015 nuclear pact, though a senior US official noted the talks must cover other “regional issues” – a potential deal-breaker for Tehran... the US, Britain, France, Russia and China, plus Germany ... READ MORE ... Remove the cause if you fear the effect.
China has called for an “unconditional” US return to the 2015Iran nuclear agreement and removal of the sanctions it restored against the Islamic Republic after unilaterally abandoning the UN-endorsed agreement. “The Iranian nuclear issue is at a crucial juncture ... US must make up for past wrongdoings before returning to JCPOA. Iran FM ... Iran FM ... .
Eight teachers’ unions throughout the state are pushing Gov. Mike DeWine to rethink his timeline for school reopening and vaccine distribution ... “Governor DeWine should make good on his pledge to prioritize pre-K to 12 school employees, and he should do so without any coerced preconditions,” the joint statement by the teachers unions stated ... .