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What is the relative performance difference of if/else versus switch statement in Java?
...ptimization and premature optimization, which are evil. Rather worry about readabililty and maintainability of the code in question. If there are more than two if/else blocks glued together or its size is unpredictable, then you may highly consider a switch statement.
Alternatively, you can also gr...
C++ const map element access
...t the STL map doesn't have a const index operator. That is, B[3] cannot be read-only. From the manual:
Since operator[] might insert a new element into the map, it can't possibly be a const member function.
I have no idea about at().
...
Start may not be called on a promise-style task. exception is coming
...
You are getting that error because the Task class already started the task before giving it to you. You should only ever call Start on a task that you create by calling its constructor, and you shouldn't even do that unless you have a compelling reason to not start the task w...
Custom attributes - Yea or nay?
Recently I have been reading more and more about people using custom attributes in their HTML tags, mainly for the purpose of embedding some extra bits of data for use in javascript code.
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What does [STAThread] do?
I am learning C# 3.5 and I want to know what [STAThread] does in our programs?
3 Answers
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How to use enums as flags in C++?
...unique flags can be done using a bit shift. I, myself, find this easier to read.
enum Flags
{
A = 1 << 0, // binary 0001
B = 1 << 1, // binary 0010
C = 1 << 2, // binary 0100
D = 1 << 3, // binary 1000
};
It can hold values up to an int so that is, most of ...
Assignment inside lambda expression in Python
...thus can give us an increase in speed. At least that's my impression after reading one of Guido's essays.
My guess is this would also go against the philosophy of having one right way of doing any one thing in Python.
share...
What does the [Flags] Enum Attribute mean in C#?
...rm A = 1 << 0, B = 1 << 1, C = 1 << 2 ... Much easier to read, understand, visually check and change.
– Nick Westgate
Apr 9 '13 at 12:06
2
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Why does sudo change the PATH?
... Not only is it counterintuitive, it's incorrectly documented. Reading the man pages for sudo, and comparing the config against a Fedora box, I thought the path should be preserved. Indeed, "sudo -V" even says "Environment variables to preserve: PATH".
– Jason R. Co...
CA2202, how to solve this case
...oArray();
}
}
UPDATE: In the IDisposable.Dispose documentation you can read this:
If an object's Dispose method is called more than once, the object must ignore all calls after the first one. The object must not throw an exception if its Dispose method is called multiple times.
It can be a...