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How do I use extern to share variables between source files?
...ntain an extern declaration of the variable.
The header is included by the one source file that defines the variable
and by all the source files that reference the variable.
For each program, one source file (and only one source file) defines the
variable.
Similarly, one header file (and only one he...
What's the difference between the data structure Tree and Graph?
... a DAG).
So Trees are DAGs with the restriction that a child can only have one parent.
One thing that is important to point out, Trees aren't a recursive data structure.
They can not be implemented as a recursive data structure because of the above restrictions. But any DAG implementation, which a...
How to copy data from one table to another new table in MySQL?
I want to copy data from one table to another in MySQL.
11 Answers
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Copy constructor versus Clone()
...t is the preferred way to add (deep) copy functionality to a class? Should one implement the copy constructor, or rather derive from ICloneable and implement the Clone() method?
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Why does a base64 encoded string have an = sign at the end
...a base64 encoded string doesn't always end with a =, it will only end with one or two = if they are required to pad the string out to the proper length.
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Why should a function have only one exit-point? [closed]
...ent schools of thought, and it largely comes down to personal preference.
One is that it is less confusing if there is only a single exit point - you have a single path through the method and you know where to look for the exit. On the minus side if you use indentation to represent nesting, your co...
What is AppDomain? [duplicate]
...pain is you need to use remoting etc.
See MSDN for lots more info. To be honest, it isn't something you need to mess with very often.
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get dictionary key by value
...something like this:
var myKey = types.FirstOrDefault(x => x.Value == "one").Key;
If values are unique and are inserted less frequently than read, then create an inverse dictionary where values are keys and keys are values.
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Squash the first two commits in Git? [duplicate]
...lt;commit> you can squash any number of commits together into a single one.
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Can a div have multiple classes (Twitter Bootstrap) [duplicate]
... might want something aligned left, right or center, but it has to be only one of them) and you shouldn't use them together, or you'd get an unexpected result, basically what will happen is that the class with the highest specificity will be the one applied (or if they have the same then it'll be th...