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Undo git pull, how to bring repos to old state
Is there any way to revert or undo git pull so that my source/repos will come to old state that was before doing git pull ?
I want to do this because it merged some files which I didn't want to do so, but only merge other remaining files. So, I want to get those files back, is that possible?
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What's the difference between VARCHAR and CHAR?
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VARCHAR is variable-length.
CHAR is fixed length.
If your content is a fixed size, you'll get better performance with CHAR.
See the MySQL page on CHAR and VARCHAR Types for a detailed explanation (be sure to also read the comments...
Public Fields versus Automatic Properties
...You can't databind against a variable.
Changing a variable to a property is a breaking change. For example:
TryGetTitle(out book.Title); // requires a variable
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How are everyday machines programmed?
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Most of what you're talking about are embedded based systems where C is a luxury often not available. They don't have software in the traditional sense. Most of the time the software is written in C, assembly, or even machine code. C and ASM require compilers to be written to use them for t...
Checking if a string is empty or null in Java [duplicate]
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Correct way to check for null or empty or string containing only spaces is like this:
if(str != null && !str.trim().isEmpty()) { /* do your stuffs here */ }
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How to deal with floating point number precision in JavaScript?
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From the Floating-Point Guide:
What can I do to avoid this problem?
That depends on what kind of
calculations you’re doing.
If you really need your results to add up exactly, especially when you
work with money: use a special decimal
datatype.
If you just do...
How can I get the max (or min) value in a vector?
...uto it = max_element(std::begin(cloud), std::end(cloud)); // c++11
Otherwise, write your own:
template <typename T, size_t N> const T* mybegin(const T (&a)[N]) { return a; }
template <typename T, size_t N> const T* myend (const T (&a)[N]) { return a+N; }
See it live at ...
Case conventions on element names?
...dards originating from the W3C tend to use lower case with hyphens.
There is a philosophical distinction between seeing XML as a format for platform neutral documents, which W3C standards try to encourage, and languages such as XAML which see XML as a serialisation of a platform specific object gra...
When should a class be Comparable and/or Comparator?
...n classes which implement both Comparable and Comparator . What does this mean? Why would I use one over the other?
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How does delete[] know it's an array?
Alright, I think we all agree that what happens with the following code is undefined, depending on what is passed,
16 Answe...