TAILIEUCHUNG - HandBooks Professional Java-C-Scrip-SQL part 71

Tham khảo tài liệu 'handbooks professional java-c-scrip-sql part 71', công nghệ thông tin, kỹ thuật lập trình phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | of explaining them. Variant Summary The fact that discriminated unions are useful in everyday programming should come as no surprise and the library does an excellent job of providing efficient and easy-to-use variant types based upon discriminated unions. Because C unions aren t terribly useful for many types they support only built-in types and POD types the need for something else has been prevalent for a long time. Many attempts at creating discriminated unions have suffered from significant drawbacks. For example previous attempts usually come with a fixed set of supported types which seriously impedes maintainability and flexibility. avoids this limitation through templates which theoretically allows creating any variant type. Type-switching code has always been a problem when dealing with discriminated unions it was necessary to test for the type of the current value before acting creating maintenance headaches. offers straightforward value extraction and typesafe visitation which is a novel approach that elegantly solves that problem. Finally efficiency has often been a concern with previous attempts but this library addresses that too by using stack-based storage rather than the heap. is a mature library with a rich set of features that makes it easy and efficient to work with variant types. It nicely complements the library and it should definitely be part of your professional C toolbox. The authors of are Eric Friedman and Itay Maman. How Does the Tuple Library Improve Your Programs Multiple return values from functions Grouping of related types Ties values together C like many other programming languages allows a function to return one value. However that one value can be of arbitrary type which allows grouping multiple values as the result with a struct or class. Although possible it is often inconvenient to group related return values in such constructs because it means .

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