sets | Extension of the STL algorithms on sets | 3D Printing library
kandi X-RAY | sets Summary
kandi X-RAY | sets Summary
The sets library provides an extension to the 4 algorithms on sets that the C++ STL features, which are:. Those algorithms extract different subsets of the 2 sets they take in arguments. Here are more details about those 4 STL algorithms. By set, we mean a sorted range of data. For instance, std::set, std::map and a sorted std::vector are sets in this regard. Although the 4 algorithms in the STL are powerful, there are things that they can't do: in particular they can't output values from both sets at the same time, or aggregate two sets together for instance.
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QUESTION
I understand that after calling fork() the child process inherits the per-process file descriptor table of its parent (pointing to the same system-wide open file tables). Hence, when opening a file in a parent process and then calling fork(), both the child and parent can write to that file without overwriting one another's output (due to a shared offset in the open-file table entry).
However, suppose that, we call open() on some file after a fork (in both the parent and the child). Will this create a separate entries in the system-wide open file table, with a separate set of offsets and read-write permission flags for the child (despite the fact that it's technically the same file)? I've tried looking this up and I don't seem to be able to find a clear answer.
I'm asking this mainly since I was playing around with writing to files, and it seems like only one the outputs of the parent and child ends up in the file in the aforementioned situation. This seemed to imply that there are separate entries in the open file table for the two separate open calls, and hence separate offsets, so the slower process overwrites the output of the other process.
To illustrate this, consider the following code:
...ANSWER
Answered 2021-May-03 at 20:22There is a difference between a file and a file descriptor (FD).
All processes share the same files. They don't necessarily have access to the same files, and a file is not its name, either; two different processes which open the same name might not actually open the same file, for example if the first file were renamed or unlinked and a new file were associated with the name. But if they do open the same file, it's necessarily shared, and changes will be mutually visible.
But a file descriptor is not a file. It refers to a file (not a filename, see above), but it also contains other information, including a file position used for and updated by calls to read and write. (You can use "positioned" read and write, pread and pwrite, if you don't want to use the position in the FD.) File descriptors are shared between parent and child processes, and so the file position in the FD is also shared.
Another thing stored in the file descriptor (in the kernel, where user processes can't get at it) is the list of permitted actions (on Unix, read, write, and/or execute, and possibly others). Permissions are stored in the file directory, not in the file itself, and the requested permissions are copied into the file descriptor when the file is opened (if the permissions are available.) It's possible for a child process to have a different user or group than the parent, particularly if the parent is started with augmented permissions but drops them before spawning the child. A file descriptor for a file opened in this manner still has the same permissions uf it is shared with a child, even if the child would itself be able to open the file.
QUESTION
I have the wackiest bug. Like....the wackiest! If any of ya'll want to put eyes on this, awesomesauce! I really appriciate it! I am creating a survey with REACT, Redux, SQL, HML, Material-ui, and CSS.
I've created a graph of information with am4charts using data from a database. Everything is working and will show up on the page......but not on page load. What I am seeing in my console is that the page will load, it fires off my get request but doesn't return with the data fast enough (I think). By the time that the get request loads, my graph has populated with no data.
Here is the code that I have for the page that I am rendering. What is really odd is that, once my code has run, I can cut a line of code (I've been using a console log). And then the graph will render and load.
...ANSWER
Answered 2021-Jun-15 at 22:40Can you try this fix? I created new functions for some tasks.
https://codesandbox.io/s/vigorous-varahamihira-6j588?file=/src/App.js
QUESTION
I'm trying to add lists together using a loop. Here is some example data.
...ANSWER
Answered 2021-Jun-15 at 21:49split would be more direct and faster
QUESTION
I'm currently using Winsock2 to be able to test a connection to multiple local telnet servers, but if the server connection fails, the default Winsock client takes forever to timeout.
I've seen from other posts that select() can set a timeout for the connection part, and that setsockopt() with timeval can timeout the receiving portion of the code, but I have no idea how to implement either. Pieces of code that I've copy/pasted from other answers always seem to fail for me.
How would I use both of these functions in the default client code? Or, if it isn't possible to use those functions in the default client code, can someone give me some pointers on how to use those functions correctly?
...ANSWER
Answered 2021-Jun-15 at 21:17
select()can set a timeout for the connection part.
Yes, but only if you put the socket into non-blocking mode before calling connect(), so that connect() exits immediately and then the code can use select() to wait for the socket to report when the connect operation has finished. But the code shown is not doing that.
setsockopt()withtimevalcan timeout the receiving portion of the code
Yes, though select() can also be used to timeout a read operation, as well. Simply call select() first, and then call recv() only if select() reports that the socket is readable (has pending data to read).
Try something like this:
QUESTION
In the following histogram,
...ANSWER
Answered 2021-Jun-15 at 18:35You could loop through the bars and test whether it is completely to the right of the separation, completely to the left or crosses it. You change the bar's color correspondingly.
When a bar crosses the separator, the bar gets the color for the left area and its size is narrowed to touch the separator. A copy of the bar can be added, with the right-area color and its x-position moved.
QUESTION
I have two functions one thats triggered on a mouseenter event and the other on mouseleave. Both of these functions are repeated three times.
On mouseenter the classlist "active" is addded 5x and the text content is changed.
On mouseleave the classlist active is removed 5x and the text content is set to an empty string, and the original image is displayed again.
When the mouseenter event listener is triggered, Depending on which image is being hovered (3 images).
the text content property that gets added various between the three "Photosnap" "Dine" "Nike".
As-well as the background color that gets triggered various between "red" "blue" "pink".
Hover state shown as red left image and normal state shown as right image
-The image shown here is one of three. It is displayed with a red background and the text content of "photosnap".
-The other with a blue background and the text content of "Dine".
-The third and final with a pink background and the text content of "Nike".
I hope this paints a clear picture i am having a hard time making this a code snippet.
I am trying to refactor this javascript so its not so repetitive. I'm new to javascript and having a hard time getting this to work as something other than what i currently have. I'm not clear on how to make a function that i can call inside of other functions to cut down on the repeated code. Or possibly use the "this" keyword ?
Javascript--
...ANSWER
Answered 2021-Jun-15 at 17:23Yes you're using 3 times the same function, so we sure can do better. Here is a first simple idea, make a loop on the tree elements :
JAVASCRIPT
QUESTION
I want to use the built-in secrets feature in .NET Core and it is not working for me and I don't understand why I am doing exactly what is needed. I would appreciate it if you can help me and let me know what is missing.
In the developers commands I run this:
...ANSWER
Answered 2021-Jun-15 at 17:49You have a typo (fix "n" to "nn"): ConectionStrings should be ConnectionStrings.
You can remove the old one and create a new one with these commands:
QUESTION
I've created a simple VBA interface to connect Excel to a MySQL DB. The VBA part acts as a preview of data for the user to choose what item he wants to import to the Excel sheet.
Until now I've work with a very complete set of data, but I got to a Table which (because of the nature of the items) some fields are NULL.
Now every time I try to check the values in the VBA I get the Run-time error 13 Type mismatch in the listview component. At first I though it was a field with DECIMAL typing, but after changing it to a DOUBLE (for testing) the problem persisted, and it was until I notice that if only checks columns with no NULL value, the problem disappears. Off course I can't omit this values.
I tried some .Tostring functions but with no success. And I failed to implement a IF to check for NULL in the obj.
This is my code:
...ANSWER
Answered 2021-Apr-13 at 10:28If you don't want to add a IsNull-function in you SQL (as Nathan_Sav suggested as a comment): There is a IsNull-function in VBA. With that, you can create a simple function that returns for example an empty string (or a 0 or whatever you prefer):
QUESTION
I've read a number of questions on this same error but couldn't understand whats happening in my case. On the other questions this error is caused by an object being used as a React child or caused by more than one prop attribute being passed.
I'm trying to set formik and yup to validate a Day Field according to a Month Field, both using react-select, in such way that if the month is February then the max day allowed is 29. Just that...
I've managed to reproduce the error in a Codesandbox: https://codesandbox.io/s/formik-yup-reactselect-rmd9f?file=/src/App.js
If you select the Day 29 and any month, then it works, but if you select day 30 and February then this error appears and I can't find out what's wrong:
Uncaught Error: Objects are not valid as a React child (found: object with keys {value}). If you meant to render a collection of children, use an array instead.
The code is:
...ANSWER
Answered 2021-Jun-15 at 16:34meta.error is not guaranteed to be a string.
If you change
QUESTION
I need to find the intersection of two arrays and print out the number of elements in the intersection of the two arrays. I must also account for any duplicate elements in both the arrays. So, I decide to take care of the duplicate elements by converting the two arrays into sets and then take the intersection of both the sets. However, I encounter a segmentation fault when I run my code. I'm not sure where this occurs, any way to fix this?
...ANSWER
Answered 2021-Jun-15 at 14:37set_intersection does not allocate memory: https://en.cppreference.com/w/cpp/algorithm/set_intersection
You need a vector with some space. Change vector v; to vector v(n+m);
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