It is discouraged to simply catch System.Exception. Instead, only the “known” exceptions should be caught. Now, this sometimes leads to unnecessary repetitive code, for example: try { WebId = new Guid(queryString[“web”]); } catch (FormatException) { WebId = Guid.Empty; } catch (OverflowException) { WebId = Guid.Empty; } I wonder: Is there a way to catch both … Read more
I want to do something like: MyObject myObj = GetMyObj(); // Create and fill a new object MyObject newObj = myObj.Clone(); And then make changes to the new object that are not reflected in the original object. I don’t often need this functionality, so when it’s been necessary, I’ve resorted to creating a new object … Read more
In this question, someone suggested in a comment that I should not cast the result of malloc. i.e., I should do this: int *sieve = malloc(sizeof(*sieve) * length); rather than: int *sieve = (int *) malloc(sizeof(*sieve) * length); Why would this be the case? 2 29 TL;DR int *sieve = (int *) malloc(sizeof(int) * length); … Read more
What are the correct version numbers for C#? What came out when? Why can’t I find any answers about C# 3.5? This question is primarily to aid those who are searching for an answer using an incorrect version number, e.g. C# 3.5. The hope is that anyone failing to find an answer with the wrong … Read more
In the C and C++ programming languages, what is the difference between using angle brackets and using quotes in an include statement, as follows? #include <filename> #include “filename” 3 31
What are the proper uses of: static_cast dynamic_cast const_cast reinterpret_cast C-style cast (type)value Function-style cast type(value) How does one decide which to use in which specific cases? 9 static_cast is the first cast you should attempt to use. It does things like implicit conversions between types (such as int to float, or pointer to void*), … Read more
How do you set, clear, and toggle a bit? 2 27 Setting a bit Use the bitwise OR operator (|) to set a bit. number |= 1UL << n; That will set the nth bit of number. n should be zero, if you want to set the 1st bit and so on upto n-1, if … Read more
I’ve seen a few different ways to iterate over a dictionary in C#. Is there a standard way? 2 29 foreach(KeyValuePair<string, string> entry in myDictionary) { // do something with entry.Value or entry.Key }
I’ve been told by others that writing using namespace std; in code is wrong, and that I should use std::cout and std::cin directly instead. Why is using namespace std; considered a bad practice? Is it inefficient or does it risk declaring ambiguous variables (variables that share the same name as a function in std namespace)? … Read more
Optimizing SQLite is tricky. Bulk-insert performance of a C application can vary from 85 inserts per second to over 96,000 inserts per second! Background: We are using SQLite as part of a desktop application. We have large amounts of configuration data stored in XML files that are parsed and loaded into an SQLite database for … Read more