flat | Flat containers for C++
kandi X-RAY | flat Summary
kandi X-RAY | flat Summary
Fast+efficient associative containers using sorted arrays, with an interface based on standard containers. This was part of a C++ standard proposal and I recommend that you read it for more details: Container adaptors allow you to use any vector-like sequence container for the underlying storage. std::vector is the natural choice, but classes like boost::small_vector and boost::static_vector are useful too. Because std::vector is the most common in usage, aliases are provided for convenience. For basic use, just use the std::vector aliases. The public member container allows access to the underlying storage container. Note that it is the user's responsibility to keep the container in a sorted, unique state. Likewise, the public member of iterators: underlying, allows access to the underlying storage container's iterators. For safety reasons, flat container iterators are const by default. To bypass this safety and get non-const iterators, one can either iterate .container or take the .underlying of the iterator.
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QUESTION
I am writing a model Series class (kinda like the one in pandas) - and it should be both Positional and Associative.
...ANSWER
Answered 2022-Mar-31 at 13:17First, an MRE with an emphasis on the M1:
QUESTION
I am getting a
...ANSWER
Answered 2022-Mar-18 at 20:51std::lower_bound
takes a Cpp17ForwardIterator, which must also be a Cpp17InputIterator. The Cpp17InputIterator requirements include:
*a
reference
, convertible to T
Here, a
is a "value of type X
or const X
", so MSVC is justified in requiring a const-qualified unary indirection operator; the "or" means that the code using the iterator can use either, and the author of the iterator has to support both. (Note that Cpp17InputIterator differs from Cpp17OutputIterator, where the required operation is *r = o
, with r
a non-const reference, X&
.)
So your operator*
should have const
qualification, and return a reference; specifically, a reference to T
or const T
(this is a Cpp17ForwardIterator requirement). You can satisfy this straightforwardly with using reference = const T&
and by making cur_
and cur_valid_
mutable
.
The use of mutable
here is entirely legitimate; since operator*() const
is idempotent, it is "logically const" and the modifications to the data members are non-observable.
QUESTION
If I compile this code with GCC or Clang and enable -O2
optimizations, I still get some global object initialization. Is it even possible for any code to reach these variables?
ANSWER
Answered 2022-Mar-18 at 06:44Compiling that code with short string optimization (SSO) may be an equivalent of taking address of std::string
's member variable. Constructor have to analyze string length at compile time and choose if it can fit into internal storage of std::string
object or it have to allocate memory dynamically but then find that it never was read so allocation code can be optimized out.
Lack of optimization in this case might be an optimization flaw limited to such simple outlying examples like this one:
QUESTION
Is there a way to put text along a density line, or for that matter, any path, in ggplot2? By that, I mean either once as a label, in this style of xkcd: 1835, 1950 (middle panel), 1392, or 2234 (middle panel). Alternatively, is there a way to have the line be repeating text, such as this xkcd #930 ? My apologies for all the xkcd, I'm not sure what these styles are called, and it's the only place I can think of that I've seen this before to differentiate areas in this way.
Note: I'm not talking about the hand-drawn xkcd style, nor putting flat labels at the top
I know I can place a straight/flat piece of text, such as via annotate
or geom_text
, but I'm curious about bending such text so it appears to be along the curve of the data.
I'm also curious if there is a name for this style of text-along-line?
Example ggplot2 graph using annotate(...)
:
Above example graph modified with curved text in Inkscape:
Edit: Here's the data for the first two trial runs in March and April, as requested:
...ANSWER
Answered 2021-Nov-08 at 11:31Great question. I have often thought about this. I don't know of any packages that allow it natively, but it's not terribly difficult to do it yourself, since geom_text
accepts angle
as an aesthetic mapping.
Say we have the following plot:
QUESTION
[Editing this question completely] Thank you , for those who helped in building the Periodic Table successfully . As I completed it , I tried to link it with another of my project E-Search
, which acts like Google and fetches answers , except that it will fetch me the data of the Periodic Table .
But , I got a problem - not with the searching but with the layout . I'm trying to layout the x-scrollbar in my canvas which will display results regarding the search . However , it is not properly done . Can anyone please help ?
Below here is my code :
...ANSWER
Answered 2021-Dec-29 at 20:33I rewrote your code with some better ways to create table. My idea was to pick out the buttons that fell onto a range of type and then loop through those buttons and change its color to those type.
QUESTION
I'd like to start by saying that I'm very new to Python, and I started this project for fun.
Specifically, it’s simply a program which sends compliments to you as notifications periodically throughout the day. This is not for school, and I was actually just trying to make it for my girlfriend while introducing myself to Python.
With that in mind, here's my problem. I started this project by writing the simplest version of it: one you have to start each time your computer loads, and runs while you're actively using the computer. This portion works perfectly; however, I can't seem to figure out how to do the next step: have the program carry on as normal after reboot and save its progress.
I know how to get it to start up again after reboot. Still, I'm not sure how to save its progress. Particularly, since I'm pulling the compliments out of a text file, I'm not sure how to have the program save what line it's on before rebooting. This is needed as I don't want the program to start from the first compliment each time, as there are over 300 unique ones as of now.
In order to help you understand where my code currently is as for the best advice, I've shown it below:
...ANSWER
Answered 2022-Jan-10 at 13:42Well, you should save an index to a file or something before program shutting down.
Check this out: atexit — Exit handlers
QUESTION
I have a nested list of lists which contains some data frames. However, the data frames can appear at any level in the list. What I want to end up with is a flat list, i.e. just one level, where each element is only the data frames, with all other things discarded.
I have come up with a solution for this, but it looks very clunky and I am sure there ought to be a more elegant solution.
Importantly, I'm looking for something in base R, that can extract data frames at any level inside the nested list. I have tried unlist()
and dabbled with rapply()
but somehow not found a satisfying solution.
Example code follows: an example list, what I am actually trying to achieve, and my own solution which I am not very happy with. Thanks for any help!
...ANSWER
Answered 2021-Dec-28 at 22:13Maybe consider a simple recursive function like this
QUESTION
I don't know if the title is worded correctly, but I will try my best to explain my problem. I now have a function that updates the current user's location, which works fine. The problem is that the painted pointer remains at that exact position because the decoration is painted once inside the widget and never changes.
I have looked at how google does it with the marker object, but that didn't seem to work for my app because I am not using a normal map.
...ANSWER
Answered 2021-Dec-28 at 02:03try this:
QUESTION
Based on this question Calculate Y coordinates of an image from graph point of origin I tried to do the same in app designer GUI but it does not work. I attached an image that shows that the image does not start from graph point of origin and that I get a new figure due to the set command. Any idea how to fix/do it?
Code:
...ANSWER
Answered 2021-Dec-26 at 17:05you could try to import the image data as a 2-dimensional grid, and then flipping it.. could work not sure.
QUESTION
So this seems to be an issue talked about here and there on StackOverflow with no real solution. So I have a bunch of tests that all pass when run individual. They even pass when run as a full test suite, EXCEPT when I add in my TestCase ExploreFeedTest
. Now ExploreFeedTest
passes when run by itself and it actually doesn't fail when run in the full test suite as in running python manage.py test
, it causes another test HomeTest
to fail, which passes on it's own and passes when ExploreFeedTest
is commented out from the init.py
under the test
folder. I hear this is an issue with Django not cleaning up data properly? All my TestCase
classes are from django.test.TestCase
, because apparently if you don't use that class Django doesn't teardown the data properly, so I don't really know how to solve this. I'm also running Django 3.2.9, which is supposedly the latest. Anyone have a solution for this?
ExploreFeedTest.py
...ANSWER
Answered 2021-Dec-23 at 10:31I posted the answer on the stack overflow question
I was also using factory boy, which doesn't seem to play nice with test suite. Test suite doesn't seem to know how to rollback the DB without getting rid of factory boy generated data.
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