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How to make assignable, number-like class in Java?


How to make assignable, number-like class in Java?

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How to make assignable, number-like class in Java?
Tag : java , By : Fernando
Date : November 23 2020, 04:01 AM

around this issue Is it possible to create a number-like class in Java that would allow objects to be created like this: , For your first example:

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How do I make a class assignable to primitives? Or, how do I make a scalar class?


Tag : cpp , By : Robin Buitenhuis
Date : March 29 2020, 07:55 AM
hope this fix your issue You have to write/override an operator. In this case the cast-operator. Define a method
operator double() { return double_however_computed_from_your_time; };

How to check if a scala class is assignable from a java class


Tag : java , By : joshboles
Date : March 29 2020, 07:55 AM
it should still fix some issue I want to be able to check if a certain Scala class is assignable from a certain Java class. As stated here it is not always possible to do D.class.isAssignableFrom(A.class). , I managed to solve it like this:
def isAssignableFrom(scalaClass: Class[_], javaClass: Class[T]): Boolean = {
    val javaClassType: ru.Type = getType(javaClass)
    val scalaClassType: ru.Type = getType(scalaClass)
    scalaClassType.<:<(javaClassType)
}

def getType[T](clazz: Class[T]): ru.Type = {
    val runtimeMirror = ru.runtimeMirror(clazz.getClassLoader)
    runtimeMirror.classSymbol(clazz).toType
}

How can I make a class, with a member variable that contains unique pointers, copy assignable?


Tag : cpp , By : Ken
Date : March 29 2020, 07:55 AM
seems to work fine If you're holding items in a unique_ptr, it normally implies that you're not looking to copy them. If you want to copy them you'll have to provide the mechanism to do so:
struct my_thing {
};

using my_thing_ptr = std::unique_ptr<my_thing>;

struct my_container
{
  my_container() {}

  // the presence of _thing will implicitly delete copy constructor 
  // and copy operator so we need to provide them. 
  // Since we're defining copy operators, these will disable 
  // the automatic move operators so we need to define them too!

  my_container(const my_container& rhs)
  : _thing { rhs._thing ? new thing { *(rhs._thing) } : nullptr }
  {}

  my_container(my_container&& rhs) = default;

  my_container& operator=(const my_container&& rhs) {
    auto tmp = rhs;
    swap(tmp, *this);
    return *this;
  }

  my_container& operator=(my_container&& rhs) = default;

  // and an implementation of swap for good measure
  void swap(my_container& other) noexcept {
    using std::swap;
    swap(_thing, other._thing);
  }


  my_thing_ptr _thing;

};

How to make class with const properties assignable?


Tag : cpp , By : gorbiz
Date : March 29 2020, 07:55 AM
I wish this help you Instead of making the variables const you could just not provide any way for the user to change the values by:
making them private only allowing assignment to a another instance as the only way to change the values.
#include <iostream>

class Point {
public:
    Point(const double x_ = 0, const double y_ = 0) : x(x_), y(y_) {}
    double getX() const { return x; }
    double getY() const { return y; }
private:
    double x;
    double y;
};

int main()
{
    Point a{1,5};
    Point p;
    p = a;
    std::cout << p.getX() << ", " << p.getY();  // no error here
    //p.x = 5; // error here now
    //p.y = 7; // error here now
}

Why is a subclass in Java an instance of the super class but not assignable to it?


Tag : java , By : ponchopilate
Date : March 29 2020, 07:55 AM
may help you . If you suppose there is a function assignableTo, this is that you say but assignableFrom is reverse:
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