Static initializers are useful as cletus mentioned and I use them in the same manner. If you have a static variable that is to be initialized when the class is loaded, then a static initializer is the way to go, especially as it allows you to do a complex initialization and still have the static … Read more
If you see this error on a struct that has an automatic property, just call the parameterless contructor from your parameterized one by doing : this() example below: struct MyStruct { public int SomeProp { get; set; } public MyStruct(int someVal) : this() { this.SomeProp = someVal; } } By calling :this() from your constructor … Read more
Overloading constructors isn’t special for case classes: case class Foo(bar: Int, baz: Int) { def this(bar: Int) = this(bar, 0) } new Foo(1, 2) new Foo(1) However, you may like to also overload the apply method in the companion object, which is called when you omit new. object Foo { def apply(bar: Int) = new … Read more
We’ll start by declaring that GCC follows the Itanium C++ ABI. According to the ABI, the mangled name for your Thing::foo() is easily parsed: _Z | N | 5Thing | 3foo | E | v prefix | nested | `Thing` | `foo`| end nested | parameters: `void` You can read the constructor names similarly, as … Read more
This is not undefined behavior. Although foo is uninitialized, you are using it a way that is allowed by the standard. After space is allocated for an object but before it is fully initialized, you are allowed to use it limited ways. Both binding a reference to that variable and taking its address are allowed. … Read more
The line: Time t (12, 0, 0); … allocates a variable of type Time in local scope, generally on the stack, which will be destroyed when its scope ends. By contrast: Time* t = new Time(12, 0, 0); … allocates a block of memory by calling either ::operator new() or Time::operator new(), and subsequently calls … Read more
Edit: This question was answered in 2016 and is kind of outdated. Look at @Nenad up-to-date answer below. Solution from typescript interfaces reference: interface ClockConstructor { new (hour: number, minute: number): ClockInterface; } interface ClockInterface { tick(); } function createClock(ctor: ClockConstructor, hour: number, minute: number): ClockInterface { return new ctor(hour, minute); } class DigitalClock implements … Read more
The problem is that the base class foo has no parameterless constructor. So you must call constructor of the base class with parameters from constructor of the derived class: public bar(int a, int b) : base(a, b) { c = a * b; }
The Type class is reflection. You can do: Type theType = myobject.GetType(); // if you have an instance // or Type theType = typeof(MyObject); // if you know the type var constructor = theType.GetConstructor(Type.EmptyTypes); It will return null if a parameterless constructor does not exist. If you also want to find private constructors, use the … Read more
In order to pass the parameters you create new intent and put a parameter map: Intent myIntent = new Intent(this, NewActivityClassName.class); myIntent.putExtra(“firstKeyName”,”FirstKeyValue”); myIntent.putExtra(“secondKeyName”,”SecondKeyValue”); startActivity(myIntent); In order to get the parameters values inside the started activity, you must call the get[type]Extra() on the same intent: // getIntent() is a method from the started activity Intent myIntent … Read more