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What is java interface equivalent in Ruby?
... a class in Ruby that implements (enough of) IO, but I did it by trial and error and wasn't too happy with the process. I've also written multiple implementations of an interface of my own, but documenting which methods are required and what they are supposed to do so that other members of my team ...
How to redirect cin and cout to files?
...tions one by one and avoid using namespace std; as it would give ambiguity error:
error: reference to 'cin' is ambiguous
cin >> a >> b;
^
note: candidates are:
std::ifstream cin
ifstream cin("input.txt");
^
In file test.cpp
std::istream std::cin
exter...
Task vs Thread differences [duplicate]
...atively safely (e.g. not in finally clauses etc.), so it will help against errors like infinite loops etc. Using it in production-level code doesn't make much sense, though.
– Luaan
Mar 30 '15 at 12:14
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How to save traceback / sys.exc_info() values in a variable?
I want to save the name of the error and the traceback details into a variable. Here's is my attempt.
5 Answers
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ExecuteReader requires an open and available Connection. The connection's current state is Connectin
...ot only impact the performance tremendously but also be a source for nasty errors and (without using Transactions) a data-dumping-area.
If you're even using static connections you're creating a lock for every thread trying to access this object. ASP.NET is a multithreading environment by nature. So...
Better way of incrementing build number?
...he plist file, however it's making Xcode 4.2.1 crash frequently (with an error about the target not belonging to a project; I'm guessing the changing of the plist file is confusing Xcode in some way).
...
What is the difference between a weak reference and an unowned reference?
...the instance that it references is deallocated, you will trigger a runtime error, and the app will crash.
That's the only risk I see with it.
Link to Apple Docs
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What happens to global and static variables in a shared library when it is dynamically linked?
...al variables defined in other modules. This means that you will get linker errors if you try, for example, to create an executable that is supposed to use an extern variable defined in a DLL, because this is not allowed. You would need to provide an object file (or static library) with a definition ...
Why is SELECT * considered harmful?
...rt in the long run.
If code depends on column order, SELECT * will hide an error waiting to happen if a table had its column order changed.
Even if you need every column at the time the query is written, that might not be the case in the future
the usage complicates profiling
Design
SELECT * is ...
Virtual/pure virtual explained
...mplementation to pure virtual method in base class. Hence case #4 is still error.
– prasad
Apr 10 '17 at 16:21
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