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What are copy elision and return value optimization?
...xample taken from Wikipedia:
struct C {
C() {}
C(const C&) { std::cout << "A copy was made.\n"; }
};
C f() {
return C();
}
int main() {
std::cout << "Hello World!\n";
C obj = f();
}
Depending on the compiler & settings, the following outputs are all valid:
Hello W...
conditional unique constraint
...
It's a bad idea. The question is not it.
– FabianoLothor
Aug 1 '12 at 17:50
...
When should I really use noexcept?
...e I have ever seen anybody give where noexcept is clearly helpful / a good idea. I am starting to think move construction, move assignment, and swap are the only cases there are... Do you know of any others?
– Nemo
Dec 25 '14 at 2:16
...
What is the purpose of the : (colon) GNU Bash builtin?
...
Bad idea. Any command substitutions inside the here document are still processed.
– chepner
Sep 4 '14 at 18:57
...
Combining Multiple Commits Into One Prior To Push
...limit yourself to one commit per push.
I generally find that it's a good idea to keep each commit a single, logical, coherent change, that includes everything it needs to work (so, it does not leave your code in a broken state). If you have a two commits, but they would cause the code to be broken...
Interface vs Base class
...utting their implementations in an abstract class to inherit will be a bad idea.
Your Dog and Cat definitions should now look like:
public class Dog : Mammal, IPettable
public class Cat : Mammal, IPettable
Theoretically you can override them from a higher base class, but essentially an interfac...
How do you test functions and closures for equality?
...get fatal error: can't unsafeBitCast between types of different sizes. The idea is to build a event based system but the removeEventListener method should be able to check the function pointers.
– freezing_
Jan 28 '15 at 21:19
...
Download File to server from URL
...ouldn't be my first choice. If allow_fopen_url Off is set in php.ini (good idea for security), your script would be broken.
– PleaseStand
Oct 15 '10 at 0:43
4
...
Fixing slow initial load for IIS
... site and every time my site came up blazingly fast. This gives me a good idea that most likely the slowness I was experiencing was because of ASP.NET MVC startup times.
Get LinqPad and you can run the following script -- just change the URL to your own and let it run and you can test this easily....
sed beginner: changing all occurrences in a folder
...1 failed, $file unchanged" 1>&2
exit 1
fi
rm -f $new $old
The idea is that it overwrites a file only if a command succeeds. Useful in find and also where you would not want to use
sed 's/old/new/g' file > file # THIS CODE DOES NOT WORK
because the shell truncates the file before...