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Difference between Covariance & Contra-variance
...ore specifically, a mapping can be covariant or contravariant with respect to a relation on that set.
Consider the following two subsets of the set of all C# types. First:
{ Animal,
Tiger,
Fruit,
Banana }.
And second, this clearly related set:
{ IEnumerable<Animal>,
IEnumerabl...
What is the difference between the kernel space and the user space?
...kernel. This limits (but usually doesn't entirely eliminate) their ability to do bad things like crashing the machine.
The kernel is the core of the operating system. It normally has full access to all memory and machine hardware (and everything else on the machine). To keep the machine as stable a...
Preventing form resubmission
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There are 2 approaches people used to take here:
Method 1: Use AJAX + Redirect
This way you post your form in the background using JQuery or something similar to Page2, while the user still sees page1 displayed. Upon successful posting, you redirect the bro...
How to properly compare two Integers in Java?
... ...;
System.out.println(x == y);
this will check whether x and y refer to the same object rather than equal objects.
So
Integer x = new Integer(10);
Integer y = new Integer(10);
System.out.println(x == y);
is guaranteed to print false. Interning of "small" autoboxed values can lead to trick...
Alternatives to gprof [closed]
...nstructions for which a procedure is live on the stack, although I'm sorry to say it appears to become confused in the presence of mutual recursion. But the visualizer is very nice and light years ahead of gprof.
share
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SQL Server - copy stored procedures from one db to another
I am new to SQL, and what I needed to do was to combine 2 .mdf databases into one. I did that using SQL Server 2008 Manager - Tasks > Import/Export tables.The tables and views were copied successfully, but there are no Stored procedures in the new database. Is there any way to do that?
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What is the difference between inversedBy and mappedBy?
...
mappedBy has to be specified on the inversed side of a (bidirectional) association
inversedBy has to be specified on the owning side of a (bidirectional) association
from doctrine documentation:
ManyToOne is always the owning side of ...
What is the precise meaning of “ours” and “theirs” in git?
This might sound like too basic of a question, but I have searched for answers and I am more confused now than before.
7 An...
Try-finally block prevents StackOverflowError
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It doesn't run forever. Each stack overflow causes the code to move to the finally block. The problem is that it will take a really, really long time. The order of time is O(2^N) where N is the maximum stack depth.
Imagine the maximum depth is 5
foo() calls
foo() calls
fo...
Why is `std::move` named `std::move`?
...:move(x) function doesn't really move anything at all. It is just a cast to r-value. Why was this done? Isn't this misleading?
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