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Is there a performance impact when calling ToList()?
...on) constructor. This constructor must make a copy of the array (more generally IEnumerable<T>), otherwise future modifications of the original array will change on the source T[] also which wouldn't be desirable generally.
I would like to reiterate this will only make a difference with a hu...
What integer hash function are good that accepts an integer hash key?
...mple) and has no common factors with it. This way the hash function covers all your hash space uniformly.
Edit: The biggest disadvantage of this hash function is that it preserves divisibility, so if your integers are all divisible by 2 or by 4 (which is not uncommon), their hashes will be too. Thi...
Parse string to DateTime in C#
...teTime.Parse() will try figure out the format of the given date, and it usually does a good job. If you can guarantee dates will always be in a given format then you can use ParseExact():
string s = "2011-03-21 13:26";
DateTime dt =
DateTime.ParseExact(s, "yyyy-MM-dd HH:mm", CultureInfo.Invar...
iOS Remote Debugging
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Yep, I'm already using this one. Finally! It sucks that the windows version of Safari does not have it though.
– Hyangelo
Sep 26 '12 at 18:05
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How to parse a string to an int in C++?
...g. ss << std::hex) before trying the conversion. But this means the caller must know a priori what base the number is -- and how can the caller possibly know that? The caller doesn't know what the number is yet. They don't even know that it is a number! How can they be expected to know what ba...
How can I ssh directly to a particular directory?
...right on the directory_wanted.
Explanation
-t Force pseudo-terminal allocation. This can be used to execute arbitrary screen-based programs on a remote machine, which can be very useful, e.g. when implementing menu services.
Multiple -t options force tty allocation, even if ssh has no l...
What is the difference between ? and Object in Java generics?
...is right way to go to use ResponseEntity<?> on controller level for all my controller functions?
– Irakli
Nov 25 '16 at 7:38
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vector::at vs. vector::operator[]
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I'd say the exceptions that vector::at() throws aren't really intended to be caught by the immediately surrounding code. They are mainly useful for catching bugs in your code. If you need to bounds-check at runtime because e.g. the index comes from user input, you're indeed best of...
Difference between attr_accessor and attr_accessible
...d that makes a getter and a setter. attr_accessible is a Rails method that allows you to pass in values to a mass assignment: new(attrs) or update_attributes(attrs).
Here's a mass assignment:
Order.new({ :type => 'Corn', :quantity => 6 })
You can imagine that the order might also have a d...
Multiple working directories with Git?
...ktree section adds:
A git repository can support multiple working trees, allowing you to check out more than one branch at a time.
With git worktree add, a new working tree is associated with the repository.
This new working tree is called a "linked working tree" as opposed to the "main working ...