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const char * const versus const char *?
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The latter prevents you from modifying the_string inside print_string. It would actually be appropriate here, but perhaps the verbosity put off the developer.
char* the_string : I can change which char the_string points to, and I can modify the char to which it points...
How are Python's Built In Dictionaries Implemented?
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For a 64 bit machine, this could save up to 16 bytes per key per extra dictionary.
Shared Keys for Custom Objects & Alternatives
These shared-key dicts are intended to be used for custom objects' __dict__. To get this behavior, I believe you need to finish populating your __dict__ be...
How to implement classic sorting algorithms in modern C++?
... cmp = Compare{});
In C++11, one can define a reusable template alias to extract an iterator's value type which adds minor clutter to the sort algorithms' signatures:
template<class It>
using value_type_t = typename std::iterator_traits<It>::value_type;
template<class It, class Co...
Git: “Not currently on any branch.” Is there an easy way to get back on a branch, while keeping the
... some-branch
git merge ${commit-sha}
If you have committed and then done extra work:
git stash
git log --oneline -n1 # this will give you the SHA
git checkout some-branch
git merge ${commit-sha}
git stash pop
share
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What are the differences between numpy arrays and matrices? Which one should I use?
... here. Instead of performing fewer checks, using matrix*matrix requires an extra function call. So the advantage of using matrix is purely syntactic, not better performance.
– unutbu
Sep 18 '17 at 20:44
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How to determine if a list of polygon points are in clockwise order?
...worked perfectly for my use. Note that if you can plan ahead and spare and extra two vectors in your array, you can get rid of the comparison (or %) by adding the first vector at the tail of the array. That way you simply loop over all the elements, except the last one (length-2 instead of length-1)...
Cannot create an NSPersistentStoreCoordinator with a nil model
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This specific issue is caused by creating an extra model version and then attempting to delete it manually while Xcode is open. This causes some kind of corruption. You should not be passing in specific model versions in the momd directory.
– Mike ...
Using StringWriter for XML Serialization
...lly added <?xml version="1.0" encoding="utf-8"?><test/> to the string, then declaring the SqlParameter to be of type SqlDbType.Xml or SqlDbType.NVarChar would give you the "unable to switch the encoding" error. Then, when inserting manually via T-SQL, since you switched the declared enco...
Use of alloc init instead of new
...selected ones are:
new doesn't support custom initializers (like initWithString)
alloc-init is more explicit than new
General opinion seems to be that you should use whatever you're comfortable with.
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How to use if - else structure in a batch file?
...taneously. In this case you can still use IF...ELSE IF construct, but with extra parentheses to avoid uncertainty for the next ELSE condition:
IF %F%==1 (IF %C%==1 (
::copying the file c to d
copy "%sourceFile1%" "%destinationFile1%" )
) ELSE IF %F%==1 (IF %C%==0 (
::moving the file e t...