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Closed 10 years ago.
A really basic question:
Considering an unsigned integer value, we would like to check that is not equal to 0. Using != or >, which one would be more efficient to use in C++?
Is your application too slow? If it is, the first thing you should do is profile -- this will show you what is causing your program to be slow.
If you aren't having efficiency issues with your program then you shouldn't be worried about this. In fact, worrying about speed at this stage is a bad thing because often people write less readable code in an attempt to improve speed when it's not even an issue.
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Closed 10 years ago.
I recently got interested in lockless programming and attempted to write implement a fixed-size mostly-lockless vector (github link). While it works, I'd love to get some feedback from more experienced people if my logic looks buggy or suspicious.
Are there any standard techniques that are particularly useful when testing out lockless data structures?
std::vector is lockless. In general, any good vector implementation will be lockless, because the granularity of a vector is too low for locks to be of any use.
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Closed 10 years ago.
The object in this case is a dictionary with some search methods. Only reading operations.
Quick answer: No.
Quite the opposite, it will speed up your program, especially if you have an object that needs to load a lot of data into memory.
Just make sure nothing can write to the object while the threads run.
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Closed 12 years ago.
As you know, C++ allows multiple inheritance. But, would it be a good programming approach to use multiple inheritance or it should be avoided?
Thanks.
In general, it's not needed and can make your code more complex.
But there are cases where it's useful. As long as it's useful and isn't causing your code to become unmanageable, I see no reason to avoid it.
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Closed 12 years ago.
Before I knew that C was faster than C++ I was able to write some simple code where C executed faster than C++'s speed.
So my question is: please explain then reason behind this.
If this has already been explained elsewhere on this site or the internet, please share a link.
The reason behind this is your poor test.
C is not faster than C++ because C++
is a superset of C.
Here it is!
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Closed 12 years ago.
I'm trying to pick out my next hackery project. It'll likely be one of the following:
A sparse radix trie Implementation with extremely fast set operations
A really good soft heap implementation
A bloomier filter implementation
A collection of small financial algorithms, such as deriving total returns given a set of dividends and minimal information about them.
But I can't choose. So I thought I'd put my fate in the hands of my peers. Which of those four would you find most useful? Most interesting to work on? Which do you think is the most needed?
I didn't know what a bloomier (maybe Bloom?) filter is until reading your question. Sounds cool and useful.