Questions tagged [c++14]

Code that is written to the 2014 version of the C++ standard. Use in conjunction with the 'c++' tag.

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2answers
140 views

C++ Simple Shared Pointer Implementaion

I wrote an implementation of a shared pointer. I would like a review of it. It seems to work, but running it through Valgrind shows that that it leaks memory somewhere in my tests, but I don't know ...
4
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1answer
104 views

Contacts programming challenge

I successfully solved a problem on Hackerrank called Contacts, but I'm curious if my code in C++ looks good to C++ developers. If not, how it should be improved. Below is the short description of the ...
3
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1answer
63 views

lazy_map implementation in C++ | Similar to unordered_map but O(1) copyable

I implemented lazy_map - https://github.com/tinytrashbin/lazy_map. Can someone help with reviews ? lazy_map is an implementation of unordered_map that has O(1) cost of copying irrespective of the ...
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3answers
75 views

sorting vector of pair in efficient way

I'm trying to solve the sorting problem but I always get TLE(Time Limit Exceeded/ 1s) so... can you guys suggest a more efficient way to solve this problem? (i can't link the exercise because it is on ...
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3answers
66 views

Reversing an array in C++ 14, my second array requires an extra element

Hackerrank problem to reverse an array of size n. https://www.hackerrank.com/challenges/30-arrays/ Sample Input: 4 1 4 3 2 ...
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1answer
53 views

The Next Palindrome - CodeChef

This is codechef beginner problem. How I can make it efficient, It is taking 2.09 sec while time limit is 2.0764 secs. Problem is: For a given positive integer K of not more than 1000000 digits, write ...
4
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1answer
37 views

Solving Tents puzzles using a SAT solver

I built a solver for Tents puzzles using the CaDiCaL SAT solver. The code works and runs quickly, it takes less than 0.1 seconds for a ...
10
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3answers
2k views

A Tic Tac Toe game in C++

I am a beginner programmer and have made a tic tac toe program in c++. I need some help with my memory management can anyone review and help me. This is my code ...
5
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1answer
99 views

Using Euler-Maruyama method to solve Ornstein-Uhlenbeck equation (SDE)

I am trying to implement the Euler–Maruyama method and use it to solve the Ornstein–Uhlenbeck process. I am basing my code on the wikipedia page where a python implementation is shown. More generally ...
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2answers
222 views

Reactor pattern in modern C++. Please comment on coding improvements to be done

The reactor possesses its own thread to wait for messages in an event loop. Users should be able to start or stop the reactor at any point. These two operations are not required to be thread-safe. ...
2
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1answer
184 views

Implementing toggle button using Qt

I have below code for implement toggle button. After including below code, processing power consumed over 90% in my embedded application. Is there any way to reduce this processing power. ...
2
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1answer
81 views

Code to sort based on quantities of a data member occuring

The setup is that I have a vector of a class, and I need to sort it by the quantity of a data member value, not the value itself. The below code exhibits the correct behavior, and part of that ...
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0answers
98 views

Implementing GSL synchronized_value

Core Guidelines mention a type synchronized_value<T>, which supposedly pairs std::mutex with the internal value. I couldn'...
5
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1answer
111 views

Meta functions for sequences of exponents of 2

I have implemented some meta functions to create sequence for exponents of 2. I would love to know if there is any way to make the code more optimized. Note: ...
2
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1answer
78 views

C++ reactor bad implementation

folks. I have recently started writing software using Modern C++ 11-14. I have been developing software for more than a decade and just wanted to broaden my skillset. I am practicing building some ...
3
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1answer
2k views

Simple C++ Telegram Bot

Hi :) I am a beginner coder who just learnt C++ and I wanted to apply it in projects to solidify my learning process. However, I only took a short tutorial before trying this out hence I'm pretty ...
2
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1answer
93 views

Generate binary image using coordinate vectors

I have a matrix M of size [n_rows, n_cols] and a list of x and ...
3
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2answers
137 views

Benchmarking insertion sort

More than once I claimed that using binary search doesn't improve performance of the insertion sort. For example, see answer here and comments here). Now I have time to substantiate my claim. The ...
4
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2answers
118 views

Rolling median function (Daily Coding Problem 377)

Given an array of numbers arr and a window of size k, print out the median of each window of size k starting from the left and moving right by one position each time. For example, given the ...
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11answers
8k views

Find nth Fibonacci Number, using iteration and recursion

I'm a beginner programmer and I came upon this problem which is to find the n​th number in the Fibonacci series. I used to solve the problem using a for loop; ...
3
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1answer
74 views

Substitution Cipher: Which One?

I'm a beginner and I have a question (somehow silly and stupid :) ). Today I decided to challenge myself and I came around the challenge that wanted me to create a program that ciphers (or encrypts) ...
2
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1answer
484 views

Get word frequency of a txt file and save it to linked list

I'm a novice in C++. I want to do three things: Get the number of lines in the file Get the number of total words in the file Get each frequency of each "unique ...
3
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1answer
87 views

Unique and shared resource owner

I need a unique_ptr and shared_ptr like structure, but instead of pointers, I would like to store some kind of reference to a ...
2
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1answer
111 views

Header only HTTP client library that is a wrapper around CURL

For learning purposes, I wanted to create a header-only C++ wrapper library around HTTP CURL functionality. At the moment the library only implements GET and POST, but I will add other HTTP methods ...
4
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1answer
103 views

Signal slot mechanism in C++14

Implementing signal slot mechanism again seems quite dumb because there are so many people already done this before but it is for learning and I intended some specific goals. I had some library in ...
4
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1answer
123 views

Find positive integer with a minimum number of binary 1's such that its bitwise AND with all array elements is not 0

Task You have an array of positive integers. Your task is to find an integer x such that the following are true: Bitwise AND between ...
3
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1answer
178 views

Matrix class with overloaded `operator[]`

I have implemented a Matrix class that allocates memory using unique_ptr. How to make it more diverse and optimized in terms of memory usage and efficiency? ...
2
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1answer
86 views

Subset Component Task

I've solved a problem Subset Component Problem You are given an array with n 64-bit integers: d[0],d[1],….,d[n-1]. ...
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1answer
80 views

Generic Type Trait example

I want to check that a some type has some methods: ...
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2answers
127 views

BrainF**k interpreter in C++

This question is the adaptation of this question in C++. (I'm the author of that code as well). The code: ...
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1answer
117 views

Cave Setup for Hunting the Wumpus

I am a hobbyist programmer trying to learn modern C++. My son had an assignment in his C++ class to fill in some functions that populate draw the cave in the "hunt for the wumpus" game. When I viewed ...
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5answers
9k views

Banking system in C++

I've created a program for Banking System in C++14. You are given 9 options: Open Account Close Account Show All Accounts Deposit in Account Withdraw from Account Transfer to an Account Show Balance ...
4
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0answers
76 views

Tic Tac Toe with different level AI

I've already created a code in python here with almost the same logic: Tic-Tac-Toe with changeable board size (Part 1) Tic-Tac-Toe with changeable board size (Part 2) Here's the code in C++. As I'm ...
2
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1answer
143 views

Prim's Algorithm - Minimum Spanning Tree

I have implemented Prim's Algorithm from Introduction to Algorithms. I have observed that the code is similar to Dijkstra's Algorithm, so I have used my Dijkstra's Algorithm implementation. Please ...
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0answers
40 views

A lightweight version of std::shared_ptr<T> V2

This is a lightweight version of std::shared_ptr<T> called res_ptr<T> This post is a continuation of: A lightweight ...
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2answers
373 views

A lightweight version of std::shared_ptr<T>

I wrote a simple lighter version of std::shared_ptr<T> called res_ptr<T>. ...
7
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1answer
186 views

An explicit cast for narrowing numeric conversions

Inspired by gsl::narrow_cast, I created my own implementation with the addition of a couple of features: a static assert on the types to ensure the cast is actually narrowing (if future changes to ...
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2answers
4k views

Implementation of A* algorithm in C++

I have implemented the A-Star path finding algorithm for a 2D grid. The function returns a list of positions of an acceptable path. main.cpp : ...
6
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3answers
620 views

constexpr SmallVector - std::vector like container on the stack

2 years ago I did this: SmallVector - std::vector like container on the stack now, 2 years later, I am reinventing the wheel again, this time with fully constexpr SmallVector. This time, because I ...
9
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3answers
1k views

Count the frequency of integers in an array

I recently reviewed a question here on Code Review. The problem statement is Write a program that prompts the user to input ten values between 80 and 85 and stores them in an array. Your program ...
4
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1answer
221 views

Function composition in C++

My aim was to create a function which behaves like the operator . in Haskell. Here is what I made: ...
3
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1answer
207 views

Multithreading Ticket class to wait for parallel task completion

I've implemented a "Ticket" class which is shared as a shared_ptr between multiple threads. The program flow is like this: parallelQuery() is called to start a new query job. A shared instance of ...
4
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0answers
62 views

C++14 AtomicRoundRobinPool for sharing a pool of keys

The idea here is that we have some resource that is relatively very expensive to generate, but once we have a bunch of them in a pool, we can keep reusing them instead of generating new ones. "HTTP ...
8
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1answer
339 views

Detecting existence of a class member

I wanted to detect if I have a member in a simple POD struct and after some searching and merging some methods I found on the web I've come up with this solution: ...
3
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2answers
149 views

“When to take medicine” CodeChef Challenge MEDIC

I just submitted this code to solve the "When to take medicine" challenge on CodeChef: ...
6
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2answers
179 views

String manipulation with std::adjacent_find

For the given strings (not containing numbers), print their shortened versions, where each adjacent sequence of the same characters longer than 2, change to an expression consisting of a sign and ...
3
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2answers
85 views

c++14 move constructor and assignment in simple list

I’m moving from c98 to c++14 and I’m trying to figure out how to write move correctly. I just wrote the simplest list with no functionality, just testing the construction and copy behavior. I would ...
36
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8answers
17k views

Thread Pool C++ Implementation

I have been working on this thread pool for awhile to make it as simple to use as possible. I need some tips on improving performance, and some good ways to test its performance. I was wondering if ...
-1
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1answer
61 views

Determine if matrix exists or not [closed]

any help with optimizing following code to make it run faster. Tried making function inline, tried cin.TIE(NULL), tried ios_base::sync_with_stdio(false); ...
1
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1answer
338 views

AVL tree implementation using shared_ptr/unique_ptr

I have implemented an AVL tree using shared_ptr. I know that there is an overhead regarding using shared_ptr and instead a unique_ptr could be used. But the thing is that my node contains also a ...

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