https://cppcon.org/ https://github.com/CppCon/CppCon2020 --- Our most detailed reasoning about programs is done locally: we consider a neighborhood of a program — usually a single function and the interfaces surrounding it — and reason about its behavior without reference to the remainder of the program. But this reasoning is in service of a larger goal: we want to ensure that the entire program behaves correctly. In this talk, I will take local reasoning for granted, and look at the process of joining neighborhoods of local reasoning together, and the global reasoning that ensures they form a coherent whole. I will show how we can prevent incoherent joining, and prevent the emergence of unbounded non-local recursion as the program is linked together. This talk builds upon the discussion of local reasoning in last year's talk "The Truth of a Procedure,” but is intended to be understandable independently. --- Lisa Lippincott designed the software architectures of Tanium and BigFix, two systems for managing large fleets of computers. She's also a language nerd, and has contributed to arcane parts of the C++ standard. In her spare time, she studies mathematical logic, and wants to make computer-checked proofs of correctness a routine part of programming. --- Streamed & Edited by Digital Medium Ltd - events.digital-medium.co.uk events@digital-medium.co.uk *-----* Register Now For CppCon 2022: https://cppcon.org/registration/ *-----*