Circular_Buffer | Circular Buffer/ Circular Array
kandi X-RAY | Circular_Buffer Summary
kandi X-RAY | Circular_Buffer Summary
This is pretty much an advanced version of a circular buffer that follows the STL naming conventions of std::queue,deque,vector, etc…. It supports multiple circular buffer creations without the use of reallocation, new, or malloc. The system uses a template for the configuration of the buffers for the class. Both circular buffers and circular arrays all support FIFO, LIFO, and MIXED (FIFO+LIFO); This can lead you to design a priority queue system where front entries for priority items and back entries for least priority. The library is capable of inserting and reading from both the front and the back of the queue. The buffer system this library supports is not just for ring buffer usage. There is an even more powerful array system. Both buffer types have advanced feature sets of their own we will talk about.
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QUESTION
I would like to make a dictionary (may be similar to std::multimap) with several values for the same key. The main thing here is that I want the values to have a maximum size(n) and if an (n+1)th value comes, then the 1st value should be removed (like boost::circular_buffer or something). More specifically,
I have a struct
...ANSWER
Answered 2022-Feb-28 at 21:18Thanks everyone for the replies. I got it solved with help from fCaponetto.
QUESTION
I have a http server that is created by using nghttp2. In this server I am trying to use boost's circular_buffer data structure.
Here is my C++ program which I am attempting to compile on Ubuntu 20.04.
...ANSWER
Answered 2021-Jul-29 at 00:19The gist of that first error message is that request(const request&) (a.k.a. the copy constructor) is deleted. The request class is not copyable. The error message goes on to explain why request is not copyable, but this is tangential information unless you intend to modify the library you are using.
Since request is (implicitly) non-copyable, your lambda is not allowed to push a copy of its req parameter into a container (e.g., into a boost::circular_buffer, as you are attempting). You must come up with another approach.
In other cases, a solution might be to move instead of copy into the container. However, the callback signature specified by the library requires that the req parameter be a const reference, so moving from req is not allowed.
(One approach some people will wrongly attempt is to have the lambda store a pointer to the req parameter in the container. Do not do this, as there is no guarantee that the pointer will be valid once the current call to the lambda is complete.)
It appears that the intent is for req to be completely processed by the handler. One syntactically valid option is to extract the necessary data from req and store a copy of that data in a structure of your own definition. Whether or not this is advisable goes beyond the scope of a syntax question; it goes into the intended use of the nghttp2 library (something I am not familiar with).
QUESTION
Background
I want to use boost::circular_buffer with a scoped C++17 std::pmr::polymorphic_allocator. I.e. I want the same allocator for an outer container to be used for inner containers.
Side note:
boost::circular_buffer is allocator-aware and the following assertion is true:
ANSWER
Answered 2021-May-22 at 13:50The first error message states that this isn't valid:
QUESTION
So, I am trying to write my own logger API library for my embedded system. The embedded system is using bare metal programming without any OS. Hence, the logger library is a static library. The project is being built using CMake.
The first goal of the logger is to print the log message to console. It is completed. No issues whatsoever. It is working as expected.
The second goal of the project is saving the log message to the circular(ring) buffer. This is because in case when my embedded device is not connected to the computer, I want to store those log messages in memory using circular(ring) buffer so that they can be printed out a later time when the embedded device connected to my computer. This is where I have trouble with.
It seems that when I tried to test it out in the main.c file nothing is being printed out in the console from the implementation of circular (ring) buffer.
My intention for the logger library is that. User can call the "log_print_buf" API with any string from the main.c and the API will save the string to the ring buffer. Ex: log_print_buf("why did this go wrong"). I'm trying to use the variadic c macros and ring buffer at the same time. But, anyone has a better idea or suggestions?
The circular(ring) buffer library I choose is from Embedded Artistry website. Here is a link to the article and their codes on GitHub: https://embeddedartistry.com/blog/2017/05/17/creating-a-circular-buffer-in-c-and-c/
Circular(ring) buffer GitHub : https://github.com/embeddedartistry/embedded-resources/tree/master/examples/c/circular_buffer
Any suggestions would be greatly welcome and appreciated. Thank you
This is my logger implementation code:
------------- log.h ------------------
...ANSWER
Answered 2021-Apr-05 at 17:33I'm not familiar with this circular buffer library. But judging from the prototype of circular_buf_put(), I think you are using it incorrectly.
QUESTION
In the following program, when I access elements from the front of the circular buffer using *(begin_iterator + index) I get a crash. But if I access the same elements using buffer[index], the crash is eliminated. (See the two commented lines below). Why does this happen?
ANSWER
Answered 2021-Mar-20 at 15:51You're experiencing undefined behavior because you're reading and modifying the same object unsynchronized from multiple threads.
Coding it one way or another might eliminate the crash, but the program is still wrong.
If we add a mutex, then there's no crash anymore:
QUESTION
I have program which is linking to system,chrono and thread in boost. But simply adding auto now = boost::chrono::system_clock::now() gives me a linker error.
Following is my main.cpp
...ANSWER
Answered 2021-Feb-08 at 19:42After add_executable, add target_link_libraries:
QUESTION
From the boost library, I only require circular_buffer for an android project (maybe some other later, but it will always be header-only). Thus, I would like to create a distribution containing only the required files.
I tried using the official distribution, and executing :
...ANSWER
Answered 2020-Dec-14 at 22:25Bootstrap and b2 are only required for building library binaries. As you said, you will use header-only only, so that's not required.
You can just zip up the boost/ include folders and be happy.
In theory you can prune the set of includes with BCP: https://www.boost.org/doc/libs/1_75_0/tools/bcp/doc/html/index.html
However, in practice I doubt it's worth the effort.
QUESTION
#include
template
struct circular_buffer{};
template
bool operator==(const circular_buffer &a, const circular_buffer &b) {
return true;
}
int main() {
circular_buffer a;
circular_buffer b;
a == b;
return 0;
}
ANSWER
Answered 2020-Nov-05 at 07:23Following might work for you:
QUESTION
I am using boost 1.73.0, and am trying to use circular_buffer together with manage_mapped_file to store strings in a circular buffer persisted on disk.
I do the following to create/open the circular_buffer:
...ANSWER
Answered 2020-Jun-22 at 16:40boost::interprocess::managed_mapped_file mmf(boost::interprocess::open_or_create, "./circ_buffer.bin", 10u << 10);
typedef boost::interprocess::allocator string_allocator;
typedef boost::circular_buffer circ_buf;
circ_buf* instance = mmf.find_or_construct("some_name")(10, mmf.get_segment_manager());
QUESTION
I cranked up MSVC warnings to level 4 and have a problem using accumulate over boost::circular_buffer. This code:
...ANSWER
Answered 2020-Jun-04 at 07:4325.9.2 Accumulate [accumulate] defines effect of std::accumulate as acc = std::move(acc) + *i. Since C++ for some reason does not support arithmetic operations on integer types smaller than int and instead promotes arguments on both sides of + into int prior to summing, result will be an int. Therefore you are getting a seemingly unavoidable warning here.
A possible workaround would be to define accumulator to be unsinged int and then cast final result to the desired type:
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