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Understanding Fragment's setRetainInstance(boolean)
Starting with the documentation:
5 Answers
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No == operator found while comparing structs in C++
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Starting in C++20, it should be possible to add a full set of default comparison operators (==, <=, etc.) to a class by declaring a default three-way comparison operator ("spaceship" operator), like this:
struct Point {
...
SET versus SELECT when assigning variables?
...run at once too: Example: SELECT @Int = @Int + 1, @Int = @Int + 1, if @Int started as 0, it then ends as 2. This can be very useful when doing successive string-manipulations.
– MikeTeeVee
Aug 26 '15 at 15:33
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Need to reset git branch to origin version
...e any new file or reset modified file to HEAD.
Actually, to be sure you start from a "clean slate", a git clean -f -d after the reset would ensure a working tree exactly identical to the branch you just reset to.
This blog post suggests those aliases (for master branch only, but you can adapt/...
How to send a “multipart/form-data” with requests in python?
...escribed in the section POST a Multipart-Encoded File in the requests quickstart:
>>> url = 'http://httpbin.org/post'
>>> files = {'file': ('report.xls', open('report.xls', 'rb'), 'application/vnd.ms-excel', {'Expires': '0'})}
In the above, the tuple is composed as follows:
(fi...
Why should hash functions use a prime number modulus?
...ou can only do (bucket_count / stride) probes before you're back where you started. The case you most want to avoid is stride = 0, of course, which must be special-cased, but to avoid also special-casing bucket_count / stride equal to a small integer, you can just make the bucket_count prime and not...
Git submodule head 'reference is not a tree' error
...mmit was pushed in A, but the actual commit was not pushed from B. So I'd start there.
Less likely, there's a permissions problem, and the commit cannot be pulled (possible if you're using git+ssh).
Make sure the submodule paths look ok in .git/config and .gitmodules.
One last thing to try - ins...
Using Java 8's Optional with Stream::flatMap
...tand.) However, sometimes things can be too clever. The modified code also starts off with an Optional<Other>. Then it calls Optional.map which is defined as follows:
If a value is present, apply the provided mapping function to it, and if the result is non-null, return an Optional describ...
How do you organize your version control repository?
... or directory within each project should be made via an absolute path that starts with a configurable root directory variable, e.g. ${basedir}/sub/dir/file.txt in Ant.
– Rob Williams
Jul 7 '09 at 17:46
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Passing arrays as parameters in bash
...g off the [subscript]= part is short hand for a numerically indexed array, starting with the ordinal index of 0 and incrementing with each new value in the assignment statement.
Therefore, ${array} should evaluate to the entire array, indexes and all. It should evaluate to the inverse of the assig...