Questions tagged [c++17]
Code that is written to the 2017 version of the C++ standard. Use in conjunction with the 'c++' tag.
551
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State machine with change of state triggered by internal data only [closed]
Consider the following state machine, that handles an event by using std::visit on the current state (defined as an std::variant ...
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6
votes
2
answers
423
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C++ Minimal CSV parser cut2
Looking at this questoin, I was inspired by the idea and the approach, so I tried to write a second version of the code, taking most of the comments into considerations.
Please note that I am still ...
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1
vote
1
answer
85
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Assignment function for Intervals container
I found the two related questions but they, however, do not answer my question:
interval map implementation
Where exactly does my code not adhere to the specification of the key and value type?
The ...
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2
votes
3
answers
77
views
Chain of Responsibility Pattern using std::any
The following code has a Handler class that follows the classic Chain of Responsibility pattern. But we don't want to write a new handler class for every new type ...
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3
votes
1
answer
49
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Wildcard Matching: LeetCode 44 Attempt 2
Original post:
Based on feedback from J-H in his answer I have done another attempt.
Link to question:
Given an input string (s) and a pattern (p), implement wildcard pattern matching with support ...
- 92.9k
6
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1
answer
339
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6
votes
1
answer
133
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String literals concatenation with support for dynamic strings
I have implemented a function to concatenate string literals at compile time.
Basic requirements:
Very simple API. Can be used as a one-liner. Must accept variadic string literals.
Highly optimized ...
- 459
4
votes
1
answer
143
views
JSON value with std::variant
For learning purposes, I wanted to implement a class that could hold JSON data with std::variant. Most of the implementations I found online were using incomplete types as template arguments for map, ...
- 43
3
votes
1
answer
99
views
Comparator aware `flat_set` implementation
I am currently implementing a flat_map like container in C++, and had problems with the comparator used. Thus, I reduced it to the bare minimum which I will present here. (In particular, my code here ...
- 243
1
vote
1
answer
83
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Multiple containers share a single memory resource
In my project, I'm trying to use the std::pmr allocator and monotonic_buffer_resource. I'm using vector in various classes, and ...
- 103
6
votes
2
answers
200
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Tiny Network Web Framework / Library in C++
I recently wrote a tiny network library in C++17 called Turtle on Linux and wish to seek some improvement advice on how to further develop it. Any insights would be appreciated.
Origin: As a student, ...
3
votes
1
answer
221
views
High performance 3 Way Quick Sort Implementation
My implementation of 3 way quick sort for strings.
It supposed to sort very large set of 800,000,000 objects.
This is why I added ...
- 1,326
3
votes
1
answer
142
views
Yet another sparse set implementation
I got inspired by this blog post and implemented a fixed-size sparse set, removing the need for vectors, because the sparse set's size equals at least ...
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2
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2
answers
73
views
Cache for mesh objects
I'm creating a cache system for an object (Mesh) that is expensive to create. A Mesh can be created using a small amount of ...
- 186
4
votes
1
answer
292
views
Template to unpack arguments to a std::function
I am writing some C++ code to interact with an external scripting language. I want to be able to register arbitrary C++ callable code as functions to be called from the script.
The scripting library ...
- 161
2
votes
1
answer
54
views
Reservoir sampling Algorithm A-ExpJ for C++17
Implementation of the Reservoir sampling algorithm A-ExpJ that allows sampling K random elements from a stream of elements according to their weights when we don't know the size of the stream in ...
- 23
2
votes
1
answer
110
views
Reimplementing Alias method in C++
In the following I reimplement the Walker-Vose Alias method for sampling from nonuniform, discrete probability distributions.
I am well aware that there is https://en.cppreference.com/w/cpp/numeric/...
- 944
0
votes
1
answer
50
views
Using of fold expression to read csv file
I've written a code reading csv file using fold expressions.
The only thing that should be defined is columns types and file name:
...
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-2
votes
1
answer
135
views
How can I optimize C++ serialization? [closed]
I want to serialize a C++ class Ramdomclass . Below is the serialization function.
...
5
votes
1
answer
89
views
Traverse/transform (xml) tree
I am trying to write a utility for transforming xml trees using single pass and specifying node handlers.
I used pugixml prior to this, and the library provides a ...
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4
votes
1
answer
179
views
Multithreaded MVC game engine
This is an attempt at a multithreaded model-view-controller based engine for 2d console games (board games, roguelikes that sort of thing.) The code below will provide a fully working example but is ...
- 407
0
votes
1
answer
76
views
Flippable atomic boolean
I was trying to implement a boolean that can be atomically flipped.
The suggestion on Stack Overflow is to use an integer.
This would be my implementation.
...
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5
votes
5
answers
898
views
Palindrome Permutation string
I’m starting to learn C++ by doing a lot of exercises, and I need your help so I can improve,
Here is how it goes, I will try to solve an exercise and post both the ...
- 119
4
votes
1
answer
151
views
Bin-packing C++ solution using multi-map
The need (context).
Several times a day, we need to migrate a set of digital assets from one system to another. The process uses memory (the assets are held in memory for a short time) and we need to ...
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4
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1
answer
323
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A toy application of pub/sub using C++ for self-learning
Firstly, I apologize for the lengthy post. I was not sure which code I should include.
In practice of c++, I am writing a toy application for pub/sub using c++17. ...
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2
votes
3
answers
83
views
How to efficiently build an object from list or array of strings
I am working with an API that delivers some data in a QStringList or basically a list of strings. The data contains keys and values but it is not a ...
- 121
1
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0
answers
19
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Return type-erased object to the caller, use typesafe cast in a subsequent call [closed]
Libraries might need to return "context" objects to the caller, and then require the same object in subsequent calls. In some cases, the user is not required to know what's the concrete type ...
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2
votes
2
answers
67
views
Virtual method with variations for different types
Each animal type will call reactToOwner() and exhibit its own behaviour. So simply define a reactToOwner() override for each
...
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3
votes
1
answer
57
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Load and execute shared library
This is my attempt to load shared library on linux (and may be mac - did not test yet)
I am interested if I am implementing everything correctly and if I can really use my function in a loop like that....
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1
vote
1
answer
3k
views
Convert string to date C++
New to C++ here, by combining different pieces of code I've found, i came with this solution below to convert a date in string to a date object. It works as I want but I'm not certain to do the ...
- 219
2
votes
1
answer
108
views
Storing (and retrieving) functions by indexing them by address
I want to implement a "service" of callbacks, where subscribers register or unregister a callback. I was thinking about indexing the callbacks by the function address, so that to unregister ...
- 133
5
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3
answers
337
views
2
votes
1
answer
106
views
C++17 view over the Ith elements of tuples in containers of tuples
For mainly didactic reasons, I have designed my ElementsView<I, T> class template, which provides a view over the I th ...
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4
votes
1
answer
2k
views
Create and view a family tree
I have an assignment due Friday to make a family tree. Started to code in January. My reviews from the teacher for this code was that the use of pointers was horrendous and it wasn't OOP enough. This ...
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4
votes
2
answers
208
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Multi-threaded Mandelbrot set generator slower than single thread
I am new to parallel programming. I have been playing around with multi-threading and for some reason, multi-threading the Mandelbrot set is slower than running a single thread. I have been trying to ...
- 41
1
vote
1
answer
117
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Storing different types with common base using atomic-based typeid
I'm trying to develop some kind of in-memory store for my entities. These entities are representations of the devices available on the system. There may be eg. 3 leds, 1 temp sensor, 2 engines etc. ...
- 241
0
votes
3
answers
404
views
Find local maxima of a sequence
I'm well versed in Python and Java, am just starting out with C++. Am enjoying the language and would really appreciate feedback on this solution.
kata:
Return positions and values of the "peaks&...
- 103
0
votes
1
answer
126
views
C++ stack class design
I am trying some hands on recent C++ standards. For the purpose of learning, I have implemented a Stack class as below which can hold any type of data member.
I would like everyone to review this ...
- 119
3
votes
1
answer
625
views
visit for std::any
While solving an online excersise I have written some basic implementation for a visit function that works with std::any.
The ...
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8
votes
4
answers
2k
views
Forward linked list implementation in C++
I wrote a linked list implementation in C++ to learn the concepts about linked lists as well as C++(17). I decided to use std::unique_ptr to help me avoid leaks and ...
2
votes
1
answer
514
views
C++ circular buffer that guarantees contiguous data
For interfacing with C-API that requires data in one contiguous block
I came up with the following, which seems to work nicely, but I wanted
to see if I didn't miss anything crucial. Drawback is of ...
- 23
1
vote
1
answer
169
views
C++ Chess Engine - (Magic)Bitboard-based move generation
I am currently writing a bitboard-based Chess Engine in C++, and I recently finished the move generation. I am using move-lookup-tables that get pre-calculated at application startup for sliding and ...
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12
votes
3
answers
1k
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Matrix implementation
I am trying to implement an optimal and fast running matrix in C++. I need some review of the code and ideas on how to improve the code quality if it shall be.
...
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4
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0
answers
38
views
formatting flattened string into JSON-like object in C++, part 2
I have reworked the code from my previous (linked) post.
For reference:
I have a string which contains JSON-like object flattened (stringify()ed).
I need to JSON-...
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2
votes
2
answers
160
views
Event Dispatcher for GLFW/Glad
I've tried to write an event dispatcher for a GLFW/Glad library. However I am not very used to writing efficient code (spent the majority of my life writing in C# and performance was never really the ...
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1
vote
2
answers
350
views
Automatically registering a class using header-only templated classes
I'm trying to reduce the boilerplate of a lot of header-only classes I'm using. Each of these classes must go through a registration step. I want this step to be defined in the same file as the class ...
- 551
0
votes
1
answer
194
views
Derived class constructor taking rvalue ref to base class
I've got the following classes: BaseWidget, ActiveWidget, and DetachedWidget. Both derived classes use resources provided by BaseWidget: vector and int. The current so-called "state" (...
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2
votes
1
answer
171
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Counting Radix Sort: A C++ version
Follow up to original question:
This is Radix Sort, using a counting implementation. For numbers that are N bytes in length, we use an N pass counting approach. Starting with the least significant ...
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2
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0
answers
453
views
A reuseable reconnecting TCP socket with Asio
I'm using (non-boost) Asio 1.18.1 and C++17. Forgive the boost tag, there wasn't a more specific one.
I have a async_connect_with_retry composed asynchronous ...
- 153
2
votes
3
answers
226
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Fixed-size memory allocator
I've been trying to implement a simple Boost PMR allocator that has a fixed amount of memory. My first implementation (which can be found here) had undefined behavior and did not handle memory ...
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