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What is a smart pointer and when should I use one?
...onal functionality, e.g. automatic memory deallocation, reference counting etc.
Small intro is available on page Smart Pointers - What, Why, Which?.
One of the simple smart-pointer type is std::auto_ptr (chapter 20.4.5 of C++ standard), which allows to deallocate memory automatically when it out o...
log4net vs. Nlog
...framework experience. I researched, ran through tutorials, made toy apps, etc. on Log4Net, NLog, and Enterprise Library for a few days. Came back 3-4 weeks later and put them together into a cohesive demo. Hopefully some of this is useful to you.
My recommendation for our project is this:
Use ...
What is a stack trace, and how can I use it to debug my application errors?
...if(dog == null || dog.firstName == null) return;
The above is the proper order to check for nulls, we start with the base object, dog in this case, and then begin walking down the tree of possibilities to make sure everything is valid before processing. If the order were reversed a NPE could pote...
Image Processing: Algorithm Improvement for 'Coca-Cola Can' Recognition
...view invariant local pattern descriptors. I agree that SIFT,SURF,ORB,FREAK etc. can help you in feature matching but.. What about your other parts of the question like occlusions, Bottle vs Can etc. I hope this is not a complete solution in fact if you would have GOOGLED your problem probably the fi...
Bootstrap 3 jquery event for active tab change
...I'm not getting any alert. Not even an error message. What should I do, in order to bring it outside that loop? I've declared the variable outside the document.ready function.
– SSS
Nov 2 '16 at 12:31
...
How to check file MIME type with javascript before upload?
...es prior to reading? fileReader.readAsArrayBuffer(blob.slice(0,4))? (2) In order to copy/paste file signatures, shouldn't the header be constructed with leading 0's for(var i = 0; i < bytes.length; i++) { var byte = bytes[i]; fileSignature += (byte < 10 ? "0" : "") + byte.toString(16); } ?
...
Extract elements of list at odd positions
...llowing positions (0-based, so first element is at position 0, second at 1 etc.):
1, 3, 5
so the result (actual numbers) will be:
2, 4, 6
Explanation
The [1::2] at the end is just a notation for list slicing. Usually it is in the following form:
some_list[start:stop:step]
If we omitted sta...
What is the difference between URI, URL and URN? [duplicate]
...number and route the call appropriately (+1 for the USA, 816 for Missouri, etc.).
– Stefan Gehrig
Feb 6 '11 at 13:07
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Why does X[Y] join of data.tables not allow a full outer join, or a left join?
...n of X[Y]
le <- Y[X]
mallx <- merge(X, Y, all.x = T)
# the column order is different so change to be the same as `merge`
setcolorder(le, names(mallx))
identical(le, mallx)
# [1] TRUE
If you want a full outer join
# the unique values for the keys over both data sets
unique_keys <- uniq...
JS: Check if date is less than 1 hour ago?
...nt(yourDateString), 'hours');
It will give you integer value like 1,2,5,0etc so you can easily use condition check like:
if(hours < 1) {
Also, one more thing is you can get more accurate result of the time difference (in decimals like 1.2,1.5,0.7etc) to get this kind of result use this synta...