methods

问题 I have a simple question: what's the advantage of instantiating a C# delegate as opposed to just passing the function reference? What I mean is: Why do: Thread t = new Thread(new ThreadStart(SomeObject.SomeMethod)); When you can do: Thread t = new Thread(SomeObject.SomeMethod); Both will compile and work in my experience...am I missing something? 回答1: As long as the method group SomeObject.SomeMethod has a method with return type void and taking no parameters there is no difference. This is

问题 I store some Individual objects in a slice. Before appending it to the slice I print the name of the Individual object. After I have stored it in the slice, I then retrieve it as a pointer and want to change the name to "Peter" , but the change does not work since it still prints "Steve" . Why? type Individual interface { GetName() *string SetName(name string) } type Person struct { name string } // Implement functions of the Individual interface func (p Person) GetName() *string { return &p

问题 v is an object of Vertex , and Scale is a method for a pointer to Vertex . Then why is v.Scale(10) not wrong, given that v isn't a pointer to a Vertex object? Thanks. package main import ( "fmt" "math" ) type Vertex struct { X, Y float64 } func (v Vertex) Abs() float64 { return math.Sqrt(v.X*v.X + v.Y*v.Y) } func (v *Vertex) Scale(f float64) { v.X = v.X * f v.Y = v.Y * f } func main() { v := Vertex{3, 4} v.Scale(10) fmt.Println(v.Abs()) } 回答1: Spec: Calls: A method call x.m() is valid if the

问题 how to take the methods of other classes invoked in a specific method? EXAMPLE method getItem1() public String getItem1() throws UnsupportedEncodingException{ String a = "2"; a.getBytes(); a.getBytes("we"); System.out.println(a); int t = Integer.parseInt(a); return a; } The methods called in getItem1() are: String.getBytes() String.getBytes(String) PrintStream.println(String) Integer.parseInt(String) 回答1: I would do this with javassist. So let's say you have the following class accessible in

问题 class Child; class Parent { public: void (*funcPointer)(); void (*funcPointer2)(Parent* _this); void (Child::*funcPointer3)(); }; class Child: public Parent { public: void TestFunc(){ } void Do(){ Parent p; p.funcPointer=TestFunc; // error, '=': cannot convert from 'void (__thiscall Child::* )(void)' to 'void (__cdecl *)(void)' p.funcPointer2=TestFunc; // error too, '=': cannot convert from 'void (__thiscall Child::* )(void)' to 'void (__cdecl *)(Parent *)' p.funcPointer3=TestFunc; //this

问题 I'm working on a project in C#. The previous programmer didn't know object oriented programming, so most of the code is in huge files (we're talking around 4-5000 lines) spread over tens and sometimes hundreds of methods, but only one class. Refactoring such a project is a huge undertaking, and so I've semi-learned to live with it for now. Whenever a method is used in one of the code files, the class is instantiated and then the method is called on the object instance. I'm wondering whether

问题 I'm working on a project in C#. The previous programmer didn't know object oriented programming, so most of the code is in huge files (we're talking around 4-5000 lines) spread over tens and sometimes hundreds of methods, but only one class. Refactoring such a project is a huge undertaking, and so I've semi-learned to live with it for now. Whenever a method is used in one of the code files, the class is instantiated and then the method is called on the object instance. I'm wondering whether

问题 I don't understand how classes are used. The following code gives me an error when I try to use the class. class MyStuff: def average(a, b, c): # Get the average of three numbers result = a + b + c result = result / 3 return result # Now use the function `average` from the `MyStuff` class print(MyStuff.average(9, 18, 27)) Error: File "class.py", line 7, in <module> print(MyStuff.average(9, 18, 27)) TypeError: unbound method average() must be called with MyStuff instance as first argument (got

问题 Im just wondering whether there is a way to call a method where i build the name of the method on the fly with a string. e.g. I have a method called loaddata -(void)loadData; to call this i would normally call it like [self loadData]; But i want to be able to call it dynamically with a string e.g. NSString *methodName = [[NSString alloc] initWithString:@"loadData"]; [self methodName]; This is a stupid example but i hope you get my point. I am using it for databinding classes that I am setting

问题 This question already has answers here : How to execute a JavaScript function when I have its name as a string (33 answers) Closed 5 years ago . Is it possible to call a function by using the strings ? (i.e) I have a variable var target = 'next'; . Using this string I want to call the jquery method next() . Should i use target + '()' (this is bit foolish) to call next() ? I know it can be done using conditional statements. Since it is a string got from users, but it is difficult to use