I have the following code compiled by gcc: #include <iostream> using namespace std; class Buffer { public: operator char *() { cout << "operator const * called" << endl; return buff; } private: char buff[1024]; }; int main(int, char**) { Buffer b; (char *)b; // Buffer::operator char * is called here return 0; } ...
I have a varchar field that looks like (sadly I have no control over the data): Fri, 30 Oct 2009 06:30:00 EDT Is there a way to cast this into a timestamp format so that I can then sort based on it? ...
Suppose class B extends class A. I have a List<A> that I happen to know only contains instances of B. Is there a way I can cast the List<A> to a List<B>? It seems my only option is to iterate over the collection, casting one element at time, creating a new collection. This seems like an utter waste of resources given type erasure makes ...
java.lang.ClassCastException: java.lang.Long cannot be cast to java.lang.Float Why is this a problem? The numbers that I'm trying to cast are decimals in the domain [-10.0, 10.0]. They start out as Object instances returned using JFormattedTextField.getValue(). But they must be converted to floats. stack trace: Exception in thread "AW...
Hi I am exploring ways to implement something Visitor Patterns alike without all the decorating visit methods. Sofar I found out I could use Option Strict Off in VB.NET but it has some side effects. I have a set of Shape classes that inherit from a baseclass Shape. Assume we have the following class that Accept's shapes: Public Class Sh...
I'm developing an application with plugins. I have a separate API assembly with all the API interfaces. The main application dynamically loads the plugins from dlls: object pi = Assembly.LoadFrom(plugin.AssemblyPath) .CreateInstance(plugin.ClassName); and then i'm casting it to the actual plugin type: IPlugin pluginIns...
Hello, I am trying to populate a dropdownlist with data pulled from a .resx file. Instead of having 5 different functions I'd like to be able to pass in the name of the .resx file and cast it somehow so I can retrieve it using GetReourceSet. Here's what I'm currently doing: protected void populateCountryPickList(DropDownList whatDropD...
Is there a better way of testing if a string can be converted to an integer other than something like the following? Public Function IsInt(ByVal value As Object) As Boolean Try Dim temp As Integer = CInt(value) Return True Catch ex As Exception Return False End Try End Function by "better" I mean l...
Considering following code public class A { public static void main(String[] args) { new A().main(); } void main() { B b = new B(); Object x = getClass().cast(b); test(x); } void test(Object x) { System.err.println(x.getClass()); } class B extends A { } } ...
Yes, it's a trivial piece of code to write, but I still wonder if there's a built-in replacement. Here's the code: /** * Cast x to int, throw an exception if there's loss of information */ public static int safeLongToInt(long x) { int result = (int) x; if (result != x) throw new RuntimeException("long doesn't fit in an int: "...
I have an external Web Service that returns back its own object, and I would like to get it to compile to my interfaces is this possible? (IGetPerson)testAPI.GetPersons(); Where testAPI is the external web service testAPI.GetPerson returns webservice.GetCarResponse, which is of course from the external webservice. I need to get the ...
Let's say I have type A, and a derived type B. When I perform a dynamic cast from A* to B*, what kind of "runtime checks" the environment performs? How does it know that the cast is legal? I assume that in .Net it's possible to use the attached metadata in the object's header, but what happen in C++? ...
I have a piece of C code that looks like this: const char (*foo)[2] = bar(); Now bar() is a function that returns a (const void *). How do I properly cast this const pointer? The code produces this warning from GCC : "initialization discards qualifiers from pointer target type". Here are some of my unsuccessful attempts: const char (...
I've got a method that receives an Object[] and then performs actions on that array. At first I was passing in this array as an IEnumerable<T> however the T can be of two different types. The T's will always have the same properties, even thought they're different types. Is it possible to cast to a a type at runtime so that I can use...
Again disclaimer disclaimer still learning C# and OOP generally so I hope you'll be patient with me :) I am currently working with a CMS that has a class called FileVersion which basically contains a list of properties pertaining to a file such as filename, filetype, size in bytes, id, date uploaded, is-latest-version, etc. A list of F...
The following code throws an exception. If there is no easy answer or stuff to check, I'll try to produce something that reproduces the error (though I don't know where to upload it). public static XMLobj Load(string FileName) { if (File.Exists(FileName) == false) { return null; } IRDnet.XMLobj def; XmlSerializer ...
I'm trying to figure out what the following code in C does? ((void(*)())buf)(); where 'buf' is a char array. ...
When casting a varchar value to MONEY it is rounding the value to the nearest 0.10, how do I prevent this rounding up? UPDATE: I found the problem. In a subquery, the value is being CAST from varchar to FLOAT and then I was trying to CAST from FLOAT to MONEY. ...
What is the difference between these two ways of casting in Java? (CastingClass) objectToCast; CastingClass.class.cast(objectToCast); The source of Class#cast(Object) is as follows: public T cast(Object obj) { if (obj != null && !isInstance(obj)) throw new ClassCastException(); return (T) obj; } So, cast is basically a generic...
I have a function which returns the inner text of an xml element. It returns it, however, as a const wchar_t*. I wish to return this value as an integer (And a float in some other cases). What is the best method for doing so? ...