Recent questions tagged Generics

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Is there ever a difference between an unbounded wildcard e.g. <?> and a bounded wildcard whose bound is ... cannot find that source anymore. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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generics - F# Static Member Type Constraints

I'm trying to define a function, factorize, which uses structural type constraints (requires static members Zero, One, +, ... One + ^NUM.One) [] See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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generics - What is the difference between a compile time type vs run time type for any object in Java?

What is the difference between compile time and run time type of any object in Java ? I am reading Effective Java ... for any type of object . See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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generics - Swift equivalent for MIN and MAX macros

In C / Objective-C it is possible to find the minimum and maximum value between two numbers using MIN and MAX ... on generics like this one? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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generics - Is this valid Java?

Is this valid Java? import java.util.Arrays; import java.util.List; class TestWillThatCompile { public static String ... is saying about it. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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generics - Why does the C# compiler complain that "types may unify" when they derive from different base classes?

My current non-compiling code is similar to this: public abstract class A { } public class B { } public ... single possible TA derived type? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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generics - How does Scala's (2.8) Manifest work?

I have some Scala code that makes fairly heavy use of generics, and I have gleaned from the docs that using ... sure those are still accurate. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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generics - Specify `Fn` trait bound on struct definition without fixing one of the `Fn` parameters

I have a struct that contains a function object: struct Foo<F> { func: F, } I want to add an Fn ... impl blocks, the compiler has difficulties. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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generics - C++ : Vector of template class

I have a template class named Cell as follows:- template<class T>class Cell { string header, T data; } Now I ... I do that? Thanks in advance. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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generics - Returning a default value. (C#)

I'm creating my own dictionary and I am having trouble implementing the TryGetValue function. When the key isn't found, I ... false; } .... } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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generics - find common items across multiple lists in C#

I have two generic list : List<string> TestList1 = new List<string>(); List<string> TestList2 = new List ... common items across these lists? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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668 views

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generics - Java interfaces and return types

Consider I have the following interface: public interface A { public void b(); } However I want each of the ... so that this was possible? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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generics - What does the question mark mean in a type parameter bound?

I found the definition for std::borrow::BorrowMut: pub trait BorrowMut<Borrowed>: Borrow<Borrowed> where Borrowed: ? ... section 6.1.9 Traits See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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generics - C# List<Interface>: why you cannot do `List<IFoo> foo = new List<Bar>();`

If you have an Interface IFoo and a class Bar : IFoo, why can you do the following: List<IFoo> foo = new List< ... IFoo> foo = new List<Bar>(); See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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455 views

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generics - Why was IEnumerable<T> made covariant in C# 4?

In earlier versions of C# IEnumerable was defined like this: public interface IEnumerable<T> : IEnumerable Since ... will behave different now? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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662 views

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generics - How to interpret "public <T> T readObjectData(... Class<T> type)" in Java?

I have this Java code. public <T> T readObjectData(ByteBuffer buffer, Class<T> type) { ... T retVal = (T) ... the 2nd argument (Class<T> type)? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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generics - Is this a covariance bug in C# 4?

In the following piece of code I expected to be able to implicitly cast from elements to baseElements because TBase is ... in the C# 4 compiler? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.3k views

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generics - C# - static types cannot be used as type arguments

I've a generic class, that helps me to do checks on argument values internal sealed class Argument<T> where T ... What I'm doing wrong? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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generics - WPF textblock binding with List<string>

does anyone know if there is a simple way to bind a textblock to a List. What I've done so far is ... ["ShellWindowRegion"].Add(newView); thanks See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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723 views

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generics - TypeScript: self-referencing return type for static methods in inheriting classes

With Polymorphic this in TypeScript 1.7, as I discovered here, we can define a method in a class with ... .com/Microsoft/TypeScript/issues/5863 See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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595 views

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generics - How do I return a Filter iterator from a function?

I want something like that: fn filter_one<'a, T: Int>(input: &'a Vec<T>) -> ??? { input.iter().filter(|&x ... that Fn(&T) -> bool is Sized?? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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660 views

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generics - Extend array types using where clause in Swift

I'd like to use the Accelerate framework to extend [Float] and [Double] but each of these requires a different ... )) } return result } } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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794 views

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generics - Sorting an IList in C#

So I came across an interesting problem today. We have a WCF web service that returns an IList. Not really ... solution to sorting an IList See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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generics - Why can't `&(?Sized + Trait)` be cast to `&dyn Trait`?

In the code below it is not possible to obtain a reference to a trait object from a reference to a ... the object type `dyn FooTrait` See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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460 views

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generics - Can you use "where" to require an attribute in c#?

I want to make a generic class that accepts only serializable classes, can it be done with the where ... /has the serializable attribute] See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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489 views

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generics - Scala 2.8 CanBuildFrom

Following on from another question I asked, Scala 2.8 breakout, I wanted to understand a bit more about the Scala ... are in scope for the call? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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