Something interesting about two overloaded constructors of FileInputStream in Java 7 API
Your error is here: Now, if "name" is indeed null, this(name != null ? new File(name) : null); evaluates to this(null); which in turn is equivalent to invocation of FileInputStream(null); It actually evaluates to this((File) null) -- that is, a null value explicitly typed as File. This is because the...
Chaining overloaded constructors
vb.net,constructor-overloading,constructor-chaining
What you are looking is a factory method Public Class Foo Public Shared Function GetFooFromGuid(ByVal userGUID As Guid) As Foo ' Query db return New Foo(dt.Rows(0)("FirstName").ToString(), dt.Rows(0)("LastName").ToString()) End Function End Class Or an initialization function Public Class Foo Public Sub New(ByVal userGUID As Guid) ' query DB to get firstName...
How constructor overloading works
Create a public factory static method on Task class, and make constructors private, or package private public static class Task { private Callable callable; private SubType subType; private Task(SubType subType) { System.out.println("Subtype"); this.subType = subType; } private Task(Callable callable) { System.out.println("callable"); this.callable = callable; } public static Task create (...
Maintain Object State Information when Calling Overloaded Constructor from Default Constructor
c++,cohesion,constructor-overloading
@dyp Pointed me in the right direction. HashTable(53); was creating a temporary local object - not setting the object in main to my desired size of 53. To call the overloaded constructor on my object in main rather than create a temporary object, this->HashTable::HashTable(53); worked (in Visual Studio) to force...
“Overloading” constructors with SFINAE
c++,templates,c++11,sfinae,constructor-overloading
You can't overload the constructors that way because default arguments are not part of the signature. Effectively, you have: template <typename, typename> Foo(); template <typename, typename> Foo(); This rule may be clearer outside of the template world, where these two functions cannot overload each other: void foo(int x = 42);...
In C#, how could I correctly overload this constructor?
java,c#,constructor,constructor-overloading
Warning, the code you are about to see is not suitable for most viewers. The code shown here is purely for entertainment purposes, and should not be used in actual production code. If you really want to run arbitrary code, in line, before the call to the other constructor, you...
Forward integral argument to one constructor, floatingpoint to another
c++,templates,c++11,constructor-overloading
You can do a template constructor to redirect an undeclared types to a constructor of your choosing. Lets say you want long to be your default. Using SFINAE you can check if a type T is able to be casted as a long and then pass it to the long...
Is it possible to overload a constructor that accepts a list in scala?
list,scala,constructor,constructor-overloading
create functions on a companion object which do the construction for you in a typesafe way that can be checked at compile time: class myClass(){ var someStrings: List[String]=List[String]() println("hello!") } object myClass { def fromStrings(strings: List[String]) = { val c = new myClass c.someStrings = strings } def fromInts(ints: List[Int])...