Deque | ended queue , which provides O indexed access

 by   StephenCleary C# Version: v1.1.1 License: MIT

kandi X-RAY | Deque Summary

kandi X-RAY | Deque Summary

Deque is a C# library. Deque has no bugs, it has no vulnerabilities, it has a Permissive License and it has low support. You can download it from GitHub.

A double-ended queue, which provides O(1) indexed access, O(1) removals from the front and back, amortized O(1) insertions to the front and back, and O(N) insertions and removals anywhere else.
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              Deque has a low active ecosystem.
              It has 98 star(s) with 22 fork(s). There are 5 watchers for this library.
              OutlinedDot
              It had no major release in the last 6 months.
              There are 2 open issues and 2 have been closed. There are 1 open pull requests and 0 closed requests.
              It has a neutral sentiment in the developer community.
              The latest version of Deque is v1.1.1

            kandi-Quality Quality

              Deque has 0 bugs and 0 code smells.

            kandi-Security Security

              Deque has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
              Deque code analysis shows 0 unresolved vulnerabilities.
              There are 0 security hotspots that need review.

            kandi-License License

              Deque is licensed under the MIT License. This license is Permissive.
              Permissive licenses have the least restrictions, and you can use them in most projects.

            kandi-Reuse Reuse

              Deque releases are not available. You will need to build from source code and install.

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            Deque Key Features

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            Deque Examples and Code Snippets

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            Community Discussions

            QUESTION

            std::deque is contiguous memory container or not?
            Asked 2022-Apr-07 at 14:39

            std::deque is contiguous memory container or not ?

            The famous book Effective STL by Scott Meyers says like below

            Contiguous-memory containers (also known as array-based containers] store their elements in one or more (dynamically allocated) chunks of memory, each chunk holding more than one container element. If a new element is inserted or an existing element is erased, other elements in the same memory chunk have to be shifted up or down to make room for the new element or to fill the space formerly occupied by the erased element. This kind of movement affects both performance (see Items 5 and 14) and exception safety (as we'll soon see). The standard contiguous-memory containers are vector, string, and deque. The nonstandard rope is also a contiguous-memory container.

            But you can find opposite explanation in cppreference.com

            As opposed to std::vector, the elements of a deque are not stored contiguously: typical implementations use a sequence of individually allocated fixed-size arrays, with additional bookkeeping, which means indexed access to deque must perform two pointer dereferences, compared to vector's indexed access which performs only one.

            Which one is true ?

            ...

            ANSWER

            Answered 2022-Apr-07 at 14:39

            There is no conflict between the two quotes. Scott uses the term "contiguous container" in a sense a little wider than you might have seen it used elsewhere.

            Scott writes (emphasize mine):

            Contiguous-memory containers (also known as array-based containers] store their elements in one or more (dynamically allocated) chunks of memory, [...]

            As the quote from cppref states, std::deque uses multiple arrays to store the elements. Within each array the elements are contiguous. Scott does not claim that all elements in a std::deque are contiguous in one chunk of memory.

            Source https://stackoverflow.com/questions/71784137

            QUESTION

            How do I correctly pass converting constructor from an std::queue through to the underlying std::deque?
            Asked 2022-Apr-05 at 06:38

            I have created a custom memory allocator. To use it with STL Containers, I've also created a wrapper so that it adheres to the std::allocator_traits requirements.

            ...

            ANSWER

            Answered 2022-Apr-05 at 06:38

            If you can't change CustomAlloc code as Ted Lyngmo suggested, the alternative is to define CustomQueue as a subclass of std::queue:

            Source https://stackoverflow.com/questions/71746147

            QUESTION

            std::queue and std::deque cleanup
            Asked 2022-Mar-31 at 18:34

            Suppose we have a situation where we need FIFO data structure. For example, consume some events in the order they came in.

            Additionally, we need to clear the entire queue from time to time.

            std::queue seems like the perfect fit for doing that, but unfortunately it lacks a function for clearing the container.

            So at this point, we have 2 alternatives:

            std::queue

            • we asked the STL lib what we need. Granted, the STL lib will give us more: it will give us an std::deque disguised as a std::queue
            • we got back only a part from what we need, namely the pop front and push back but without clear
            • we will have to "emulate" clear somehow, without the naive way of looping and popping

            std::deque

            • we asked the STL lib what we need
            • we got back what we asked for, but we've got too much: we also got push front and pop back

            Overall, we either received too few or too much, never exactly what we really wanted.

            Here is the thing that took me by surprise, while I was trying to provide clear functionality for using with std::queue which is a member var of my object

            ...

            ANSWER

            Answered 2022-Mar-31 at 14:40

            To clear the queue, you can also simply write

            Source https://stackoverflow.com/questions/71694365

            QUESTION

            Why does the latest "append" in my python doubly linked list have no effect?
            Asked 2022-Mar-28 at 12:28

            This is part of my doubly linked list deque python code.

            The 'appendleft' function written almost similar to the 'append' function is normally output. Why is the last 'append('apple')' code not output normally in the 'Group_of_append' function?

            ...

            ANSWER

            Answered 2022-Mar-28 at 12:28

            Your appends work fine. Problem lies in your print_list function which stops when p.next is None. Which means your last element will not be printed because its next is None.

            All in all, your logic for this list is very strange and could use a lot of rework, it would make finding mistakes like this one a lot easier for you. For example, this iterating through the whole list when appending even though you have both head and tail readily available in the deque object.

            Source https://stackoverflow.com/questions/71647355

            QUESTION

            Why were parentheses disambiguated as a function declaration with std::istream_iterator?
            Asked 2022-Mar-28 at 12:23
            auto queue = [](string str) {
                istringstream ss(str);
                //std::copy(std::istream_iterator(ss),
                //          std::istream_iterator(),
                //          std::ostream_iterator(std::cout, " "));
            
                //deque q(std::istream_iterator(ss), std::istream_iterator{});
                deque q(std::istream_iterator(ss), std::istream_iterator());
                return q;
            };
            
            
            ...

            ANSWER

            Answered 2022-Mar-28 at 12:23

            QUESTION

            Why are deques used as the underlying container for stacks by default, when vectors would do the trick?
            Asked 2022-Mar-16 at 15:52

            As I understand, any container that supports push_back(), pop_back() and back() can be used as the underlying container for stacks, but by default, deques are used. I understand the pros of deques over vectors generally (possibility to add elements at the beginning as well as at the end), but in the case of stacks, I don't see any reason to prefer deques.

            ...

            ANSWER

            Answered 2022-Mar-16 at 15:52

            I don't see any reason to prefer deques.

            A reason to prefer deque that applies to the stack use case is that individual push back has worst case constant complexity compared to vector whose individual push back is linear in worst case (it has amortised constant complexity over multiple push backs). This was particularly significant prior to C++11 when reallocating vector had to copy the elements which could be very expensive. Consider case where the elements themselves are long strings.

            Another reason to prefer deques is that they release memory as they shrink. Vectors don't. Hence, if you have a stack that temporarily grows large, then shrinks and remains small for the rest of the execution, then an underlying vector would be wasting a lot of memory.

            Historically, when STL was designed and thus when the default was chosen, there used to also be issues with very large vectors because the size of the address space didn't exceed (significantly, or at all) the amount of memory (this was before 64 bit processing was common). The consequence of the limited address space was that memory fragmentation would make it expensive or impossible to allocate large contiguous blocks of memory that a large vector would require. Furthermore, the way that vector grows by deallocating old buffers is a behaviour that causes such fragmentation.

            Source https://stackoverflow.com/questions/71499571

            QUESTION

            How to set Multiple input files in python code
            Asked 2022-Mar-04 at 16:45

            I am using this code for searching a target_string in a single input file (input.txt) and "extracting" those lines with the target_string in an output file (output.txt). Now I want to perform the same procedure but with several input files, for instance, input1.txt, input2.txt, input3.txt, ...

            How can I modify this code for doing this?

            ...

            ANSWER

            Answered 2022-Mar-04 at 16:45

            QUESTION

            Can't docker build a Golang project with internal packages
            Asked 2022-Feb-16 at 23:06

            I'm trying to build a Golang project, which contains different levels of packages inside. I've uploaded an example project here: https://github.com/David-Lor/archive.org-telegrambot/tree/example-go-dockerfile-not-building

            Files

            go.mod

            ...

            ANSWER

            Answered 2022-Feb-16 at 23:06

            The issue is in your Dockerfile; after the operation COPY ./src/* ./ the directory structure in your image is as follows:

            Source https://stackoverflow.com/questions/71148343

            QUESTION

            Issue with backstack and bottomnav in kotlin
            Asked 2022-Feb-14 at 18:53

            Hello there I'm facing some issues with the navigation between fragments

            ok I explain in detail

            I have a bottom nav with 4 fragments Home, Following, Notification, and Profile, there is no issue with the bottom navigation on backstack , but now for eg from profile fragment I jumped to a fragment called edit_profile which is not a part of the bottom nav and when press back I want that it should go back to the profile fragment but the backstack is taking me from edit_profile to directly home fragment

            here is a recording link

            I recently change my project from java to kotlin and I'm a beginner in kotlin

            i really like the navigation of Pinterest and Instagram

            Note:- All this code is automatically changed to kotlin (with some changes done manually ) , this issue was also with java and not after migrating to kotlin , Also if you want more reference of the code please tell me i will update the question

            Code

            MainActivity.kt // Bottom Nav

            ...

            ANSWER

            Answered 2022-Jan-13 at 10:08

            Usually I follow this pattern

            Where I add HomeF in main container which includes all bottom nav tab, and all bottom nav tab will open in home container, and those fragment which are not part of bottom nav will open in main container. I generally add(not replace) all the fragments in main container and set add to back stack , so that if user goes from profile (home_container) to something in main container , while backstack we can pop the top fragment and user will be seeing profile.

            Source https://stackoverflow.com/questions/70694011

            QUESTION

            pyqtgraph: fixing the number of strings displayed on the x-axis when using TimeAxisItem and tickStrings
            Asked 2022-Feb-09 at 06:59

            I am making a scrolling graph which will plot real-time sensor data, with time on the x axis. I am a bit confused by the behavior of tickStrings.

            My code is based on the example below (from here). As the number of points plotted increases, the number of x axis strings varies - sometimes it increases and sometimes it decreases . It stabilizes once the deque is full length and the 'scrolling' begins.

            Is it possible to keep the spacing between tick strings the same as the number of plotted points increases? I guess that it might be possible use an approach where blank tick strings are replaced as new data is added, but don't know how to do that.

            Edit: An example of what I wish to achieve is here.

            ...

            ANSWER

            Answered 2022-Feb-02 at 13:32

            To set constant number of ticks, You have to override tickValues method as well. This method generates tick values and tickStrings method gives these values string representation - conversion to human readable time in Your case.

            Here is example of TimeAxisItem You can use in Your code:

            Source https://stackoverflow.com/questions/70920246

            Community Discussions, Code Snippets contain sources that include Stack Exchange Network

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