I was searching an MS-SQL Server 2005 database to make sure that a certain text field was always a multiple of 8 in length. When I ran the following query, I got that several rows were of length 30. But when I investigated those records, I found that they were longer than that. select distinct len(cast(textfield as varchar)) from tabl...
In C#, if a class has all the correct methods/signatures for an Interface, but doesn't explicitly implement it like: class foo : IDoo {} Can the class still be cast as that interface? ...
Hello! I encounter a totally strange behavior of the Java compiler. I can't cast a supertype to a subtype when cyclic generic type relation is involved. JUnit test case to reproduce the problem: public class _SupertypeGenericTest { interface ISpace<S extends ISpace<S, A>, A extends IAtom<S, A>> { } interface IAtom<S extends ISpac...
I've created two classes, with one of them having an implicit cast between them: public class Class1 { public int Test1; } public class Class2 { public int Test2; public static implicit operator Class1(Class2 item) { return new Class1{Test1 = item.Test2}; } } When I create a new list of one type and try t...
Is there a way to auto-cast Spring beans to the class defined in the application context XML? I'd like to avoid putting type information about the beans in 2 places.... in the xml configuration file and also in the code as a cast. For instance, given this config file <bean id="bean-name" class="SimpleSpringBean" scope="prototype"> ...
Say I have enum as follows (taken from MSDN example): enum Days {Sat=1, Sun, Mon, Tue, Wed, Thu, Fri}; I can then use is in the code as follows: int today = (int)Days.Sun; Question: Can I evaluate enums? Say I have a variable Day whose value is "Sun". Will Days.Day evaluate to Days.Sun? Thanks! Please don't get hung up on the d...
There was a passing comment in a book of mine about people inputting commas into integers and messing up your program, but it didn't elaborate. That got me thinking, so I tried writing a little algorithm to take an std::string and remove all non-integer characters. This code compiles but skips over output. Why isn't anything being assign...
In Java, suppose I have 3 classes, C extends from B which extends from A. And I have one method: public void f(A a); If I do something like this: C c = new C() B b = (B) c; f(b); f accepts b as type C since C and B both extend from A. I wanted f to receive b as type B and not type C. Is there anyway to force this upcasting? ...
Hi. What is the best way of converting a unsigned char array to a float array in c++? I presently have a for loop as follows for (i=0 ;i< len; i++) float_buff[i]= (float) char_buff[i]; I also need to reverse the procedure, i.e convert from unsigned char to float (float to 8bit conversion) for (i=0 ;i< len; i++) char_buff[i]...
Right... this one had me baffled for a while today so maybe one of you SQL Server bright sparks can shed some light on this behaviour. We have a table Phones. In it, the phone numbers are stored as nvarchars and it contains numbers in International format, in only numeric format... so a US number +1-(212)-999-9999 is stored as 121299999...
I need some help. I am creating a SelectItem class like this: public class SelectItem<T> where T : class { public bool IsChecked { get; set; } public T Item { get; set; } } I would like the following code to be valid SelectItem<String> obj = new SelectItem<String> { Item = "Value" }; obj.IsChecked = true; String objValue = ...
I need to recursively cast a PHP SimpleXMLObject to an array. The problem is that each sub element is also a PHP SimpleXMLElement. Is this possible? ...
I'm trying to add plugins to my program, and this looks good, except that I can't cast the correct type from the dll. I Have a solution with several projects on it. One of the project is a country Layer, that actually holds a CountryBase (defined as public abstract class CountryBase : CountryLayers.ICountryBase ) The Interface (public i...
I stumbled across this code. std::ostringstream str; /// (some usage) assert( ! str ); What does ostringstream signify when used in a bool context? Is this possibly an incorrect usage that happens to compile and run? ...
When a compiler finds a signed / unsigned mismatch, what action does it take? Is the signed number cast to an unsigned or vice versa? and why? ...
I am trying to debug an issue involving a ClassCastException in Java. In the interest of solving the issue I need to know what is going on when I cast from Object to a specific type. Can anyone explain to me how the Java cast operator works at the Java level and the JVM level? ...
I'm having an issue with pulling a Spring bean from an application context. When I try; InnerThread instance = (InnerThread) SpringContextFactory.getApplicationContext().getBean("innerThread", InnerThread.class); I get; org.springframework.beans.factory.BeanNotOfRequiredTypeException: Bean named 'innerThread' must be of type [com.g...
Consider the following piece of code :- class A {}; class B : private A {}; B* bPtr1 = new B; // A* aPtr1 = bPtr1; // error // A* aPtr2 = static_cast<A*>(bPtr1); // error A* aPtr3 = (A*)bPtr1; B* bPtr2 = (B*)aPtr3; The C-style cast discards the private inheritance while both the implicit and static_cast fail (also dynamic_cast). Why...
In C, in an Unix environment (Plan9), I have got an array as memory. uchar mem[32*1024]; I need that array to contain different fields, such as an int (integer) to indicate the size of memory free and avaliable. So, I've tried this: uchar* memp=mem; *memp=(int)250; //An example of size I want to assign. I know the size of an int i...
Last week a young student ask me if marshalling is the same as casting. My answer was definetly no. Marshalling is seralization, the way to transform a memory representation of an objet into bytes in order to be transmitted to a network whereas casting is related to type convertion / coercion. Later on, rethinking the question I was tho...