C question on casting
Can anybody explain me this statement! pin.sin_addr.s_addr = ((struct in_addr *)(hp->h_addr))->s_addr; ...
casting
Why does null need an explicit type cast here?
The following code does not compile: //int a = ... int? b = (int?) (a != 0 ? a : null); In order to compile, it needs to be changed to int? b = (a != 0 ? a : (int?) null); Since both b = null and b = a are legal, this doesn't make sense to me. Why do we have to cast the null into an int? and why can't we simply provide an explicit...
Casting pointer to object to void * in C++
I've been reading StackOverflow too much and started doubting all the code I've ever written, I keep thinking "Is that undefined behavour?" even in code that has been working for ages. So my question - Is it safe and well defined behavour to cast a pointer to an object (In this case abstract interface classes) to a void* and then later ...
AS3 Accessing Variables of Parent Class From Child
i'm trying to assign a parent's variable from the parent's child //Parent public class Main extends Sprite { public var selectedSquare:Sprite; public function Main() { //inits and adds new Square child class to display list } ... ------- //Child public function dragSquare(evt:MouseEvent):void ...
Casting interfaces in java
I had two separate interfaces, one 'MultiLingual' for choosing language of text to return, and second 'Justification' to justify returned text. Now I need to join them, but I'm stuck at 'java.lang.ClassCastException' error. Class Book is not important here. Data.length and FormattedInt.width correspond to the width of the line. The code ...
sqrt(int_value + 0.0) -- Does it have a purpose?
Hello, while doing some homework in my very strange C++ book, which I've been told before to throw away, had a very peculiar code segment. I know homework stuff always throws in extra "mystery" to try to confuse you like indenting 2 lines after a single-statement for-loop. But this one I'm confused on because it seems to serve some real-...
How to ANSI-C cast from unsigned int * to char *?
I want these two print functions to do the same thing: unsigned int Arraye[] = {0xffff,0xefef,65,66,67,68,69,0}; char Arrage[] = {0xffff,0xefef,65,66,67,68,69,0}; printf("%s", (char*)(2+ Arraye)); printf("%s", (char*)(2+ Arrage)); where Array is an unsigned int. Normally, I would change the type but, the proble...
In a class with no virtual methods or superclass, is it safe to assume (address of first member variable) == this?
Hi all, I made a private API that assumes that the address of the first member-object in the class will be the same as the class's this-pointer... that way the member-object can trivially derive a pointer to the object that it is a member of, without having to store a pointer explicitly. Given that I am willing to make sure that the co...
Casting objects to Integer,string ,...
Hello everybody! I have one small problem. I have list of types(int,string,..) ArrayList<Class> typeList; and I have some input values; ArrayList<Object> values; How to cast some value to some type if I know which type from the typeList is the values; typeList.get(i).cast(values.get(i)); <- this is not working??? Actualy I gene...
Why can't I enter an integer value into a decimal field?
I'm trying to write an insert statement for a SQL Server table that inserts the value 1 into a decimal field. The field is of the type decimal(10, 10) which, as far as I understand, means that it can have up to 10 digits altogether, and up to 10 of those digits can be after the decimal point. But, when I try to run the insert statement I...
Casting a object to a base class , return the extented object??
My Code: public class Contact { public string id{ get; set; } public string contact_type_id { get; set; } public string value{ get; set; } public string person_id { get; set; } public Contact() { } } public class Contact:Base.Contact { public ContactType ContactType { get; set; } public Person Perso...
Is There an Easy Way to Convert a Boolean to an Integer?
I am new to scala and I am finding the need to convert a boolean value to an integer. I know i can use something like if (x) 1 else 0 but I would like to know if there is a preferred method, or something built into the framework (ie toInt()) ...
java.lang.classcastExcption
Hi, I have an array list of objects in my application. private static ArrayList<Player> userList=new ArrayList<Player>(); In my application, I am converting this list to byte array and then sending it to other clients. At client When I am trying to cast it back to the ArrayList, its giving me casting error. I am doing this in client...
Cast array in Object variable to type in System.Type variable
I have this function: Public Sub DoStuff(ByVal type as System.Type, ByVal value as Object) End Sub The 'value' argument is always an array of the same type as 'type'. How can I loop through the values of the array? I'd like to be able to do something like this: DoStuff(GetType(Integer), New Integer(){1,2,3}) Public Sub DoStuff(ByV...
How to cast an array to an array with another primitive type
Hi, Can someone complete the code on an easy way? float[] floats = {...}; // create an array // Now I want to create a new array of ints from the arrays floats int[] ints = ????; I know I can simply cast element by element to a new array. But is it possible on an easier way? Thanks ...
Which cast am I using?
I'm trying to cast away const from an object but it doesn't work. But if I use old C-way of casting code compiles. So which casting I'm suppose to use to achieve this same effect? I wouldn't like to cast the old way. //file IntSet.h #include "stdafx.h" #pragma once /*Class representing set of integers*/ template<class T> class IntSet {...
Microsoft SQL Server 2005 cast bigint to string
How can I cast a bigint variable to a string? DECLARE @id bigint ...
Microsoft SQL Server 2005 cast date/time to string
How can I convert @lastEndTime to a string formated YYYY-MM-DD HH:MM:SS.MS? DECLARE @lastEndTime datetime ...
Casting SelectedItem of WPF Combobox to Color causes exception
I have a combobox databound to the available system colors. When the user selects a color the following code is fired: private void cboFontColour_SelectionChanged(object sender, SelectionChangedEventArgs e) { Color colour = (Color)(cboFontColour.SelectedItem); } This throws a Casting Exception with the following message: "Specifie...
Java Generic Casting Type Mismatch
public class MaxHeap<T extends Comparable<T>> implements Heap<T>{ private T[] heap; private int lastIndex; public void main(String[] args){ int i; T[] arr = {1,3,4,5,2}; //ERROR HERE ******* foo } public T[] Heapsort(T[]anArray, int n){ // build initial heap T[]sortedArray = anArray; for (int i = n-1; i< 0; i--)...