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Why use #ifndef CLASS_H and #define CLASS_H in .h file but not in .cpp?
... your .cpp file, open any files #included by it, concatenate them all into one massive text file, and then perform syntax analysis and finally it will convert it to some intermediate code, optimize/perform other tasks, and finally generate the assembly output for the target architecture. Because of...
What is the point of a private pure virtual function?
... You can read more about it in his article "Virtuality".
There is however one more interesting thing in the code you presented, that deserves some more attention, in my opinion. The public interface consists of a set of overloaded non-virtual functions and those functions call non-public, non-overl...
How to implement a ConfigurationSection with a ConfigurationElementCollection
...ep running up against exceptions that I do not understand. I am hoping someone can fill in the blanks here.
5 Answers
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“tag already exists in the remote" error after recreating the git tag
... so I am adding a note here. If you replace a tag on a central server, anyone who has the old tag—any clone of that central-server repository that already has the tag—could retain its old tag. So while this tells you how to do it, be really sure you want to do it. You'll need to get everyone ...
Solving a “communications link failure” with JDBC and MySQL [duplicate]
...s to solve this problem. I have tested many approaches that have been mentioned in different web sites, but non of them worked. Finally I changed my code and found out what was the problem. I'll try to tell you about different approaches and sum them up here.
While I was seeking the internet to fin...
Java Timer vs ExecutorService?
...ed Timer and ExecutorService to schedule tasks, what is the benefit of one using over another?
6 Answers
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How to check if DST (Daylight Saving Time) is in effect, and if so, the offset?
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This code uses the fact that getTimezoneOffset returns a greater value during Standard Time versus Daylight Saving Time (DST). Thus it determines the expected output during Standard Time, and it compares whether the output of the given date the same (Standard) o...
Getting an object from an NSSet
...essage. If it returns nil, the set does not contain an object equal to the one you passed; if it returns an object pointer, then the pointer it returns is to the object already in the set. The objects in the set must implement hash and isEqual: for this to be useful.
– Peter Ho...
How to compare 2 files fast using .NET?
...file, and you're checking to see if a new file is the same as the existing one, pre-computing the checksum on your "existing" file would mean only needing to do the DiskIO one time, on the new file. This would likely be faster than a byte-by-byte comparison.
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Simplest way to read json from a URL in java
...;
import java.net.URL;
import java.nio.charset.Charset;
import org.json.JSONException;
import org.json.JSONObject;
public class JsonReader {
private static String readAll(Reader rd) throws IOException {
StringBuilder sb = new StringBuilder();
int cp;
while ((cp = rd.read()) != -1) {...