I would say don’t catch the exception if you really can’t handle it. And logging isn’t considered handling an error. Better to bubble it up to someone who can by throwing the exception. If you must return a value, and null is the only sensible thing, there’s nothing wrong with that. Just document it and … Read more
After playing with the code I was able to figure it out. Here is the solution. public async Task DeleteSchoolTask(int schoolNumber, int taskDetailId) { var result = await GetTaskTypeAndId(taskDetailId); int taskId = result.Item1; string taskType = result.Item2; // step 1: delete attachment physically from server var fileService = new FileService(Logger, CurrentUser); var relativeFilePath = $”{schoolNumber}\\{Consts.RM_SCHOOL}\\{taskDetailId}”; … Read more
Returning a small object with both the boolean flag and the String inside is probably the most OO-like way of doing it, although I agree that it seems overkill for a simple case like this. Another alternative is to always return a String, and have null (or an empty String – you choose which) indicate … Read more
In Python 3.x, you can use concurrent.futures.ThreadPoolExecutor to do this, rather than rolling your own. Python 2.x actually has a built-in thread pool you can use as well, its just not well documented: from multiprocessing.pool import ThreadPool def foo(word, number): print (word * number) r[(word,number)] = number return number words = [‘hello’, ‘world’, ‘test’, ‘word’, … Read more
To return a value when using try/catch you can use a temporary variable, e.g. public static double add(String[] values) { double sum = 0.0; try { int length = values.length; double arrayValues[] = new double[length]; for(int i = 0; i < length; i++) { arrayValues[i] = Double.parseDouble(values[i]); sum += arrayValues[i]; } } catch(NumberFormatException e) { … Read more
enums are supposed to be type safe. I think they didn’t make them implicitly castable to discourage other uses. Although the framework allows you to assign a constant value to them, you should reconsider your intent. If you primarily use the enum for storing constant values, consider using a static class: public static class ReturnValue … Read more
If the static array is automatically freed after completing the execution, then how can we still access the values of the static array correctly? Nope, it’s not like that. static variables are initialized before starting main() and its lifetime is the entire execution of the program. So, they can be returned from functions (in which … Read more
For x86 at least, the return value of this function should be in eax register. Anything that was there will be considered to be the return value by the caller. Because eax is used as return register, it is often used as “scratch” register by callee, because it does not need to be preserved. This … Read more
GCC has a feature called statement expressions So if define macro like #define FOO(A) ({int retval; retval = do_something(A); retval;}) then you will be able to use it like foo = FOO(bar);
To summarize from other answers & comments, basically you have 3 choices: Get C++17 to be able to use [[nodiscard]] In g++ (also clang++), use compiler extensions like __wur (defined as __attribute__ ((__warn_unused_result__))), or the more portable (C++11 and up only) [[gnu::warn_unused_result]] attribute. Use runtime checks to catch the problem during unit testing If all … Read more