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. class Matrix { // Some static assertions and useful types static_assert(std::is_arithmetic_v<T>, “Matrix template parameter type must be arithmetic”); using DataType = std::vector<T>; … Read more
Can we overload operator++ for pre-increment and post-increment? i.e. calling SampleObject++ and ++SampleObject gives the correct results. class CSample { public: int m_iValue; // just to directly fetch inside main() CSample() : m_iValue(0) {} CSample(int val) : m_iValue(val) {} // Overloading ++ for Pre-Increment int /*CSample& */ operator++() { // can also adopt to return … Read more
In C# you can do this: foo = string.Format(“{0} {1} {2} {3} …”, “aa”, “bb”, “cc” …); This method Format() accepts infinite parameters, being the first one how the string should be formatted and the rest are values to be put in the string. Today I’ve come to a situation where I had to get … Read more
According to the Groovy docs, the == is just a “clever” equals() as it also takes care of avoiding NullPointerException: Java’s == is actually Groovy’s is() method, and Groovy’s == is a clever equals()! […] But to do the usual equals() comparison, you should prefer Groovy’s ==, as it also takes care of avoiding NullPointerException, … Read more
I can not understand why the constructor is executed with the parameter Double[]? using System.Collections.Generic; using System.Linq; using System.Text; namespace MyConsoleApp { class Program { static void Main(string[] args) { D myD = new D(null); Console.ReadLine(); } } public class D { public D(object o) { Console.WriteLine(“Object”); } public D(double[] array) { Console.WriteLine(“Array”); } public … Read more
Consider this piece of code: #include <iostream> #include <vector> #include <algorithm> #include <functional> using namespace std; struct MyStruct { int key; std::string stringValue; MyStruct(int k, const std::string& s) : key(k), stringValue(s) {} bool operator < (const MyStruct& other) { return (key < other.key); } }; int main() { std::vector < MyStruct > vec; vec.push_back(MyStruct(2, “is”)); … Read more
First example: int main(){ using namespace std; vector<int> v1{10, 20, 30, 40, 50}; vector<int> v2{10, 20, 30, 40, 50}; if(v1==v2) cout<<“equal”; else cout<<“unequal”; } // it returns equal Second example: int main(){ using namespace std; vector<int> v1{10, 20, 30, 40, 50}; vector<int> v2{10, 20, 100000, 40, 50}; if(v1==v2) cout<<“equal”; else cout<<“unequal”; } // it returns … Read more
template <typename CRTP> struct Pre { CRTP & operator++(); }; template <typename CRTP> struct Post { CRTP operator++(int); }; struct Derived : Pre<Derived> , Post<Derived> {}; int main() { Derived d; d++; ++d; } I get these errors from GCC: <source>: In function ‘int main()’: <source>:18:10: error: request for member ‘operator++’ is ambiguous d++; ^~ … Read more
It’s difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center. Closed 12 years ago. As function overloading says: Function overloading is absent … Read more
Code public class TestOverload { public TestOverload(int i){System.out.println(“Int”);} public TestOverload(char… c){System.out.println(“char”);} public static void main(String[] args) { new TestOverload(‘a’); new TestOverload(65); } } Output Int Int Is it expected behaviour? If so, then why? I am expecting: char, Int Note: I am using Java 8 Answer Methods with varargs (…) have the lowest priority when … Read more
