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Constructors in C++ Language


By : chintu
Date : August 01 2020, 07:00 AM
may help you . In your main method, you create a Rectangle a;, which calls your default constructor Rectangle(). Then in the next line you create a temporary element with Rectangle(2,3);, which calls your initialization constructor Rectangle(int initial_w, int initial_h), but it is discarded immediately, as you have not assigned it to a variable. Finally, you output your default-constructed variable a.
It seems what you want to achieve is this:
code :
int main()
{
    Rectangle a(2, 3);
    cout << a.get_width() << endl;
}


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Passing fields to Scala subclass constructors that have Java parents without similar constructors


By : Anshad
Date : March 29 2020, 07:55 AM
Hope that helps I have an abstract base class, written in Scala, that extends a 3rd party (open source) Java 7 class: , You can just call setFoo in the body of Bar.
code :
abstract class Bar(val foo: Foo) extends Fizz {
  setFoo(foo)
}
abstract class Bar(foo: Foo) extends Fizz {
  setFoo(foo)
}
scala> class Bar(val foo: Foo) extends Fizz {
     |   setFoo(foo)
     | }
defined class Bar

scala> val bar = new Bar(Foo(1))
bar: Bar = Bar@3a384e3d

scala> bar.getFoo
res7: Foo = Foo(1)

scala> bar.foo
res8: Foo = Foo(1)

scala> bar.setFoo(Foo(2))

scala> bar.getFoo
res10: Foo = Foo(2)

scala> bar.foo
res11: Foo = Foo(1)  // still the old foo!!!

Resolving error-prone ConstructorLeaksThis warning on constructors which call other constructors


By : hardeep
Date : March 29 2020, 07:55 AM
like below fixes the issue Error-prone defines ConstructorLeaksThis problem:

Kotlin equivalent of class properties, constructors, empty parameter constructors, getters and setters


By : Richard
Date : March 29 2020, 07:55 AM
this one helps. I am currently practicing in developing kotlin and as of now I seem to get confused with kotlin's class structure. , This is the equivalent Kotlin code for your Java code:
code :
class SampleClass(var `var`: String? = null)

How do primary constructors, secondary constructors and class members interact with each other in Kotlin?


By : Lajos
Date : March 29 2020, 07:55 AM
around this issue
the class members rely on the arguments in the primary constructor to be implemented
code :
<init>(initialCapacity: Int)
<init>(elements: Collection<E>)

What is the difference between delegating constructors in the member initializer list and in the body of constructors


By : Celik Marberd
Date : March 29 2020, 07:55 AM
seems to work fine [class.base.init]/6 is fairly clear in how to delegate constructors, and it cannot be done in the body of the constructor.
An example
code :
#include <iostream>

struct A
{
    A() : a(42) {}
    A(int) : A() {}

    int a = 17;
};

struct B
{
    B() : b(42) {}
    B(int) { B(); }

    int b = 17;
};

int main()
{
    A a{0};
    B b{0};
    std::cout << a.a << " " << b.b << std::endl;
}
$ ./a.out
42 17
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