My ClassA looks like this: class ClassA { private: static uint32_t IDCOUNTER; uint32_t _id = -1; public: ClassA(); ~ClassA(); ClassA(const ClassA&) = delete; void operator=(const ClassA&) = delete; }; I want to create one specific instance of ClassA and I want it to be passed around but I don’t want it to ever be duplicated ..
Category : assignment-operator
I would like to know the execution flow of compound assignments in C++. I came across a CodeChef question, where I am calculating NCR mod p values and adding them together to get the final answer: // correct for(int i=min1; i<=max1; i+=2){ ans = (ans+ncr_mod_p(n,i))%mod; } // incorrect for(int i=min1; i<=max1; i+=2){ ans+=ncr_mod_p(n,i)%mod; } This ..
The self-contained program section below leads to this error on Visual Studio 2019: "function "partition_data::operator=(const partition_data &)" (implicitly declared)" is a deleted function. Based on research around this type of problem I have defined a move assignment operator because of the unique_ptr but I still get the above error. How can I resolve this error ..
The code is: #include<iostream> using namespace std; class Integer { int num; public: Integer() { num = 0; cout<<"1"; } Integer(int arg) { cout<<"2"; num = arg; } int getValue() { cout<<"3"; return num; } }; int main() { Integer i; i = 10; // calls parameterized constructor why?? cout<<i.getValue(); return 0; } In the ..
class base { public: // base(const base&) = delete; base():b(16) { cout << "construct" << endl; } ~base() { cout << "destruct" << endl; } int a; int b; void operator=(base&& other) // base& operator=(base&& other) // this needs to collaborate with "return *this" { this->a = other.a; this->b = other.b; // return *this; } ..
class base { public: base(const base&) = delete; base() { cout << "construct" << endl; } ~base() { cout << "destruct" << endl; } int a; int b; /* The difference explanation I desired is here */ void operator=(base&& other) // base& operator=(base&& other) // this needs to collaborate with "return *this" { this->a = ..
I want to be able to assign an object to any already existing datatype. Here’s an example of what I’m trying to achieve: class MyInt { public: int x; MyInt (const int y) : x(y) {} /// constructor } void func () { MyInt mc(8); int a = mc; char b = mc; long long ..
I have 4 classes in a diamond inheritance hierarchy. Is it right to call both parents’ assignment operator for the assignment operator in der12 class? Wouldn’t it call the base operator= 2 times? Is there a better way to do it? protected: int a = 1; public: base& operator=(const base& ref){ … } }; class ..
I have a class that declares a vector of vectors in a .h header file as follows: #include <vector> class Mapper { public: … Mapper(const uint num_rows, const uint num_cols, const double initial_val); … private: … std::vector<std::vector<double>> grid_map_; … }; And the definition of the Mapper class is implemented in a corresponding .cpp. However, I’m ..
I’m currently learning C and am now at the part of structs and lists. I just wondered, if there ist something like "a = a+b" = "a += b" for this case. Source: Windows Que..
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