I am new to C++ and cannot figure out this error I am getting. I have created a Card class that stores a suit and rank as an unsigned integer. I also have a Maingame class that runs multiple functions. I want to create 5 Card objects inside of my Maingame class, but I am… Read More Initializing objects inside of constructors C++

In the code below I try to calculate the distance between two iterators. The iterators start at the same position and I advance once three times, so I feel like the distance between the two should be three, but I always get 0. Why? using namespace std; stringstream strstream{"Hello world"}; auto b = istream_iterator<char>{strstream}; auto… Read More Why does std::distance return zero?

I am writing a header file, i am trying to change a variable in the main class, but an error pops up: "a nonstatic member must be relative to a specific object" I am not trying to make an object, and the variable must be nonstatic, The solutions i found involve making an object, or… Read More How do i reference a nonstatic member of a class in C++

The problem in question is Two Sum. This is the error message: ================================================================= ==31==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x6020000001a0 at pc 0x000000346130 bp 0x7ffcd0ff6df0 sp 0x7ffcd0ff6de8 READ of size 4 at 0x6020000001a0 thread T0 #2 0x7f5dcdb820b2 (/lib/x86_64-linux-gnu/libc.so.6+0x270b2) 0x6020000001a0 is located 0 bytes to the right of 16-byte region [0x602000000190,0x6020000001a0) allocated by thread T0 here: #6… Read More I am getting an error with my leet code solution and i don't understand it

I’m having a bit of confusion trying to understand what’s happening here. If a class object calls a method which then in tern destroys the object, then the method should never return and the object should be destroyed right away and the destructor be called immediately.. Right? But instead the code just crashes.. So is… Read More Can a method called from an object delete the object?

I want to use type shared_ptr as the key of an unordered_map. In order to use the content of the string as key rather than use the pointer address, I define function "hashFn" as hash function. However, code below cannot work. I insert (p1, 0) and then find p2 which has the same content with… Read More unordered_map with self-defined hash function cannot work

This is Minimal Working Example, for the problem I am facingin in my real code. #include <iostream> namespace Test1 { static const std::string MSG1="Something really big message"; } struct Person{ std::string name; }; int main() { auto p = (Person*)malloc(sizeof(Person)); p = new(p)Person(); p->name=Test1::MSG1; std::cout << "name: "<< p->name << std::endl; free(p); std::cout << "done"… Read More Why there is memory leak in this c++ program and how to solve , given the constraints?

I get the error "error C3861: popen: identifier not found", if I run through vs code then everything works, but if I run through microsoft vs then the program does not want to compile. How to fix it? code (c++): #include <iostream> #include <string> #include <cstdlib> int main() { std::string result = ""; FILE* pipe… Read More error C3861: popen, pclose: identifier not found in c++

There is a HasPtr class: class HasPtr { friend void swap(HasPtr&, HasPtr&); public: HasPtr(const std::string& s = std::string()) : ps(new std::string(s)), i(0), use(new std::size_t(1)) {} HasPtr(const HasPtr& hp) : ps(hp.ps), i(hp.i), use(hp.use) { ++*use; } HasPtr& operator=(HasPtr hp) { swap(*this, hp); return *this; } ~HasPtr() { if (–*use == 0) { delete ps; delete use;… Read More Why at the moment of sorting the object vector the counter of created objects of the class is increased by an additional 2?

I need to rewrite an array in given order below: Write a void shuffle function (int* we, int count, int* wy) that rewrites the the elements of the we array (where the count parameter specifies the size of the we array) to the array wy according to the scheme shown in the figure below: I… Read More Rewriting array in given order