I know it's ridiculous but I need it for storage optimization. Is there any good way to implement it in C++ ? It has to be flexible enough so that I can use as normal data type e.g Vector< int20 >, operator overloading etc.. ...
I have encountered the following problem which proved to me that I know far too little about the workings of C++. I use a base class with pure virtual functions class Base ... and a derived classes of type class Derived : public Base{ private: Foo* f1; ... Both have assignment operators implemented. Among other things, t...
I have a conversion like this: Class1 *p1; Class2 *p2 = new Class2(); p1 = (Class1 *) p2; Can I override the typecast operator above to return a custom Class1 object pointer? If yes how? EDIT: My exact problem is that I have code like this: if (*$1 == ArrayType(AnyType())) { $$ = ((ArrayType *) $1)->getElementsType(); } Operat...
I'm porting code that uses a very large array of floats, which may trigger malloc failures from c to c++. I asked a question about whether I should use vectors or deques and Niki Yoshiuchi generously offered me this example of a safely wrapped type: template<typename T> class VectorDeque { private: enum TYPE { NONE, DEQUE, VECTOR }; ...
Hey, I am trying to preform operator overloading in C++; for some reason the compiles keeps on giving me the error error: ‘bool Matrix::operator==(const Matrix&, const Matrix&)’ must take exactly one argument Now, I know that there is some way to to it with one argument using this, but I understood that by using friend I can do i...
Hi , I have a problem with the operator < that i wrote: in Node.h : . .. bool operator<(const Node<T>& other) const; const T& GetData (); . .. template <class T> const T& Node<T>::GetData () { return m_data; } template <class T> bool Node<T>:: operator<(const Node<T>& other) const { return (*(this->GetData()) < *(other.GetData())); ...
Discriminated unions and other primitive types in F# uses structural equality by default, and provides a generated override for the .Equals method. The F# equality operator apparently differs from the C# one in that it uses the .Equals method even for reference types, but when F# discriminated unions are used from C#, the default operato...
hey i am a new programer in c++ and i have an abstract class A, and i implemented operators in it. and now i have two classes B and C that extend A. for some reason the compiler does not identify the operators. is it because that operators are not inherrited? or is it because that i have a code bug? here is the code: #ifndef A_ #d...
Note: as noted by sellibitze I am not up-to-date on rvalues references, therefore the methods I propose contain mistakes, read his anwser to understand which. I was reading one of Linus' rant yesterday and there is (somewhere) a rant against operator overloading. The complaint it seems is that if you have an object of type S then: S a...
I have a vector class with a properly overloaded Vect*float operator and am trying to create the global/non-member float*Vect operator as follows: (Note this is a heavily edited sample) class Vect { public: Vect::Vect(const float p_x, const float p_y, const float p_z, const float p_w); Vect operator*(const float p_sc...
I need to define an Interface which has to enforce certain operator overloading to the types which implements it. There doesn't seem an obvious way to do it since operator overloading has to be done using static methods in class. Is there any way to achieve the same effect (using abstract classes or anything else)? ...
I have defined a prolog file with the following code: divisible(X, Y) :- X mod Y =:= 0. divisibleBy(X, Y) :- divisible(X, Y). op(35,xfx,divisibleBy). Prolog is complaining that '$record_clause'/2: No permission to modify static_procedure `op/3' What am I doing wrong? I want to define an divisibleBy operator that will a...
I am trying to create a "value" template class, where additional properties can be assign to it easily. Properties are stored in std::map<std::string, std::string>, and operator[] has been overloaded to provide quick access to them. #if ! defined __VALUE_H__ #define __VALUE_H__ #include <string> #include <map> namespace Algorithm { ...
Let's say I have a class like so: class Gerbil{ int id; float x,y,z; } Let's further say this is part of a real-time simulation where I have a server/client setup and I change a property on the server-side: //... gerbil.x = 9.0; //... Now I want to send over this change to the client to synchronize the world state. However,...
Hey, I would like to know the difference between these 2 operator definitions: 1: class Rational{ //... public: //... Rational operator -() const{ return Rational(-t,b);} //... }; 2: class Rational{ //... public: //... friend Rational operator -(const Rational& v) {return Rational(-t,b);} //... }; as far as i understand, for the u...
How can I overload operator++ in two different ways (for a++ and ++a)? ...
Hey guys, So I have a class which overrides Equals(object obj) and GetHashCode() along with implementing IEquatable. To make working with this type a little more natural when checking for equality I thought, heck, I'd overload the equality operator and inequality operator, no worries... Uh oh, worries... consider the following - where ...
Possible Duplicate: Could anyone explain these undefined behaviors (i = i++ + ++i , i = i++, etc) Class test { public: int a=10; void operator ++(int) { a=a++; cout<<a; } }; after calling the function in main a displays same value? if i put only a++ in ++ function then its works or a=a++ is workin...
I have overloaded [] operator in my class Interval to return minutes or seconds. But I am not sure how to assign values to minutes or second using [] operator. For example : I can use this statement cout << a[1] << "min and " << a[0] << "sec" << endl; but I want to overload [] operator, so that I can even assign values to minutes or ...
hey, i got something that i cannot understand ,there are two types of solutions for overloading this operator 1 is including the friend at the start of the method and the other 1 goes without the friend. i would very much like if some1 explain whats the difference between them advantages / disadvantages. for example overloading the opera...