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Why is it impossible to build a compiler that can determine if a C++ function will change the value
...er any given program will terminate. This is known as the halting problem, and it's one of those things that's not computable.
To be clear, you can write a compiler that can determine that a function does change the variable in some cases, but you can't write one that reliably tells you that the fu...
What do helper and helper_method do?
... This is used for any method that you need to access from both controllers and helpers/views (standard helper methods are not available in controllers). e.g. common use case:
#application_controller.rb
def current_user
@current_user ||= User.find_by_id!(session[:user_id])
end
helper_method :curre...
Get all files that have been modified in git branch
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An alternative to the answer by @Marco Ponti, and avoiding the checkout:
git diff --name-only <notMainDev> $(git merge-base <notMainDev> <mainDev>)
If your particular shell doesn't understand the $() construct, use back-ticks instead.
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How do lexical closures work?
.... This is exactly the problem, though - in this environment, i is mutated, and the closures all refer to the same i.
Here is the best solution I can come up with - create a function creater and invoke that instead. This will force different environments for each of the functions created, with a dif...
jQuery: Can I call delay() between addClass() and such?
...t or dequeue is to let jQuery know that you are done with this queued item and that it should move on to the next one.
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Unlimited Bash History [closed]
...want my .bash_history file to be unlimited. e.g. So I can always go back and see how I built/configured something, or what that nifty command was, or how some command broke something weeks ago. How do I change this setting?
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How to use SVN, Branch? Tag? Trunk?
I was googling around a little bit and couldn't find a good "beginners" guide to SVN , not in the meaning of "how do I use the commands" rather; How do I control my source code?
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What are the differences between concepts and template constraints?
...w what are the semantic differences between the C++ full concepts proposal and template constraints (for instance, constraints as appeared in Dlang or the new concepts-lite proposal for C++1y ).
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Find the files existing in one directory but not in the other [closed]
...es existing in one directory but not in the other, I tried to use this command:
14 Answers
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Difference between web reference and service reference?
What is the difference between web reference and service reference in WCF?
Which is preferable in WCF?
5 Answers
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