Having being taught during my C++ days about evils of the C-style cast operator I was pleased at first to find that in Java 5 java.lang.Class had acquired cast method. I thought that finally we have an OO way of dealing with casting. Turns out Class.cast is not the same as static_cast in C++. It is more like reinterpret_cast. It will...
I have never used Informix before and I'm trying to write a query that will return records over the last 365 days. Here is the query I have been trying to use: Select * from Visit where vis_mod_dt between today-365 and today; That returns no records even though I know that there is data for the last 365 days. I am guessing that the ...
Hi to all. I have this scenario: A SQL Server table myTable with field1, xmlField (nvarchar(50) and xml sql server data type) Linq to entities Now I'd like to get a query like this: SELECT Field1, XmlField FROM MyTable WHERE CAST(XmlField AS nvarchar(4000)) = '<myXml />' Obviously this is a correct query in SQL Server but I can't...
I have a object graph that is setup like this Clients string Name List[Address] Addresses I would like to cast this to MyClients: Clients string Name List[MyAddress] Addresses MyAddress: Address String City I know that I can cast this by walking the whole object graph and in the given example that would not b...
I discovered the reason I was getting "Operation could destabilize the runtime" in a DynamicMethod I'm producing, and though I easily fixed it, it left me with a seemingly simple question: How do I cast an object reference of type "Object" into a specific type, so that I can call methods from that type on the object reference? Below ...
I am having trouble with a complex script which sometimes (About 2 or 3 times while calulating about 90'000 values), generates a '-0' and writes it into the database. I suspect it's a string (The values which are calulated can result in integers, floats or strings.)* Is there any PHP calculation which might result in a '-0'? * = Oh, ho...
I have a base class defined as: Public MustInherit Class BaseRepository(Of T As Class) and a class that inherits from this class, defined as: Public Class CommunicationTypeRepository Inherits BaseRepository(Of CommunicationType) For testing purposes I have created a helper method that will use Moq to help fetching some ...
Here's the situation: I am using ILMerge to merge an assembly & all it's references into 1 .dll file using this method (custom.dll). I have an application which dynamically loads this assembly at runtime (program.exe). Both application & assembly use a common library (common.dll). Abstract class ClassX is defined in common.dll whilst...
I have a place in the code that used to say const myType & myVar = someMethod(); The problem is that: someMethod() returns const myType I need to be able to change myVar later on, by assigning a default value if the object is in an invalid state. So I need to make myVar to be non-const. I assume I need to make myVar be non-referen...
What's the most idiomatic way in Java to verify that a cast from long to int did not lose any information? This is my current implementation: public static int safeLongToInt(long l) { int i = (int)l; if ((long)i != l) { throw new IllegalArgumentException(l + " cannot be cast to int without changing its value."); } ...
I have a dictionary object that I am pulling data out of. The field is supposed to be a string field but sometime all that it contains is a number. I get the info using: NSString *post = [[temp objectAtIndex:i] valueForKey:@"POSTDESCRIPTION"]; So it is going into a string object. However, when I try to assign that to a cell's text via...
I am working on a project that uses many web services. Many of them return the same class as a response. Right now, I am wanting to be able to pass the result from one web service in as a parameter to another. This isn't working though. When I try to implicitly cast it, it says it can't be implicitly cast. When I try to explicitly c...
Here's a thinned out version of the classes I have. public abstract class BaseParent { } public abstract class ChildCollectionItem<T> where T : BaseParent { // References a third-party object that acts as the parent to both the collection // items and the collection itself. public T parent; // References the collection to w...
In the Python documentation and on mailing lists I see that values are sometimes "cast", and sometimes "coerced". What is the difference? ...
Is there any reason to prefer static_cast<> over C style casting? Are they equivalent? Is their any sort of speed difference? ...
I have to pack and unpack a 16bit Int from/into a Ushort in VB.net This is how I thought I could do it (doesn't work, gives me overflow exception) 'Pack Int16 into ushort ' Dim usPacked = CType(Data, UShort) 'unpack Int16 from ushort ' Dim unpacked = CType(data,Int16) Thanks! ...
public Configuration(Node node, File file) { HashMap<String, String> conf = (HashMap<String, String>) SerializationUtils.deserialize(new FileInputStream(file)); } I understand why this gives an unsafe cast warning, but what's the best/accepted way to do this safely? Is there any good way? ...
Let's say you have yourself a class like the following: public sealed class StringToInt { private string _myString; private StringToInt(string value) { _myString = value; } public static implicit operator int(StringToInt obj) { return Convert.ToInt32(obj._myString); } public static im...
At some point in an algorithm I need to compare the float value of a property of a class to a float. So I do this: if (self.scroller.currentValue <= 0.1) { } where currentValue is a float property. However, when I have equality and self.scroller.currentValue = 0.1 the if statement is not fulfilled and the code not executed! I found o...
Hi I'm trying to convert from an int to a float in C and for some reason the cast changes the value and I'm not sure why. So: fprintf (stderr, "%d,%d\n", rgbValues->green, (float)rgbValues->green); produces two different numbers. Note that rgbValues->green is an int. Any idea why this is happening? Thanks ...