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Purging file from Git repo failed, unable to create new backup
...can find those in .git/refs/original/…. Either delete that directory and all files within, or use the -f flag to force Git to delete the old references.
git filter-branch -f \
--index-filter 'git rm --cached --ignore-unmatch Rakefile' HEAD
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Why is my Spring @Autowired field null?
...of Control (IoC) container has three main logical components: a registry (called the ApplicationContext) of components (beans) that are available to be used by the application, a configurer system that injects objects' dependencies into them by matching up the dependencies with beans in the context,...
In C/C++ what's the simplest way to reverse the order of bits in a byte?
...b;
}
First the left four bits are swapped with the right four bits. Then all adjacent pairs are swapped and then all adjacent single bits. This results in a reversed order.
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Difference between C++03 throw() specifier C++11 noexcept
...Exception specifiers were deprecated because exception specifiers are generally a terrible idea. noexcept was added because it's the one reasonably useful use of an exception specifier: knowing when a function won't throw an exception. Thus it becomes a binary choice: functions that will throw and f...
Rails: How can I set default values in ActiveRecord?
...of the available methods, but I believe that defining an after_initialize callback is the way to go for the following reasons:
default_scope will initialize values for new models, but then that will become the scope on which you find the model. If you just want to initialize some numbers to 0 then...
What is a handle in C++?
I have been told that a handle is sort of a pointer, but not, and that it allows you to keep a reference to an object, rather than the object itself. What is a more elaborate explanation?
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Assign variable in if condition statement, good practice or not? [closed]
...tended to write this:
if (value == someFunction()) {
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}
If you really want to do the assignment in place, I would recommend doing an explicit comparison as well:
if ((value = someFunction()) === <whatever truthy value you are expecting>) {
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}
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What is the proper way to check if a string is empty in Perl?
... situation where you haven't already guarded against undef, then the catch-all for "non-empty" that won't warn is if (defined $str and length $str).
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How to construct a set out of list items in python?
... list of filenames in python and I would want to construct a set out of all the filenames.
6 Answers
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How do I compare strings in Java?
I've been using the == operator in my program to compare all my strings so far.
However, I ran into a bug, changed one of them into .equals() instead, and it fixed the bug.
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