reflection

问题 What kind of animal is an empty argument? Consider the following piece of code. > f <- function(...) match.call() > l <- as.list(f(,3)) > l [[1]] f [[2]] [[3]] [1] 3 > typeof(l[[2]]) [1] "symbol" > identical(l[[2]],``) Error: attempt to use zero-length variable name > as.character(l[[2]]) [1] "" What sorcery is that? 回答1: If looks like l[[2]] 's value is a special object: the empty symbol. Some facts about the empty symbol (speculated based on casual experimentation). (1) The empty symbol is

问题 Is there a possibility to check if two python functions are interchangeable? For instance, if I have def foo(a, b): pass def bar(x, y): pass def baz(x,y,z): pass I would like a function is_compatible(a,b) that returns True when passed foo and bar, but False when passed bar and baz, so I can check if they're interchangeable before actually calling either of them. 回答1: Take a look at inspect.getargspec(): inspect.getargspec(func) Get the names and default values of a function’s arguments. A

问题 I have been searching for a newbie question, but can't find a simple example. Can anyone give me a simple example how to get MethodBody into most available string result? Like: using Mono.Cecil; using Mono.Cecil.Cil; namespace my { public class Main { public Main() { // phseudo code, but doesnt work Console.Write( getMethod("HelloWorld").GetMethodBody().ToString() ); } public void HelloWorld(){ MessageBox.Show("Hiiiiiiiiii"); } } } 回答1: Start with reading your assembly: var path = "... path

问题 I have a method which compares two objects and returns a list of all the property names which are different. public static IList<string> GetDifferingProperties(object source, object target) { var sourceType = source.GetType(); var sourceProperties = sourceType.GetProperties(); var targetType = target.GetType(); var targetProperties = targetType.GetProperties(); var properties = (from s in sourceProperties from t in targetProperties where s.Name == t.Name && s.PropertyType == t.PropertyType &&

问题 I have a method which compares two objects and returns a list of all the property names which are different. public static IList<string> GetDifferingProperties(object source, object target) { var sourceType = source.GetType(); var sourceProperties = sourceType.GetProperties(); var targetType = target.GetType(); var targetProperties = targetType.GetProperties(); var properties = (from s in sourceProperties from t in targetProperties where s.Name == t.Name && s.PropertyType == t.PropertyType &&

问题 I have a method which compares two objects and returns a list of all the property names which are different. public static IList<string> GetDifferingProperties(object source, object target) { var sourceType = source.GetType(); var sourceProperties = sourceType.GetProperties(); var targetType = target.GetType(); var targetProperties = targetType.GetProperties(); var properties = (from s in sourceProperties from t in targetProperties where s.Name == t.Name && s.PropertyType == t.PropertyType &&

问题 I'm not sure of the terminology for this kind of code, but I want to know if it's possible to instantiate variables after the parentheses, but whilst using reflection. I have a map which gets loaded from an XML file. This is a collection of (int X, int Y, string S) where the X,Y is the position of some terrain, and S is a string representing the type of the terrain. I have a dictionary to pass between the strings and the relevant types; for example one key-value pair might be "Tree", typeof

问题 Based on another post I am trying to get a companion object for a class given the class name. But I cannot get it to compile: val clazz = Class.forName(className) val rootMirror = scala.reflect.runtime.universe.runtimeMirror(clazz.getClassLoader) val classSymbol = rootMirror.classSymbol(clazz) val classMirror = rootMirror.reflectClass(classSymbol) val moduleMirror = classMirror.companion.get But the last line gives me the following compiler error: - value companion is not a member of reflect

问题 Closed. This question is not reproducible or was caused by typos. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 4 years ago . Improve this question Say I have this enum: public enum MyEnum{ ValueOne = 1, ValueTwo = 2, ValueThree = 3 } And then this field/variable: public MyEnum myEnumInstance = MyEnum.ValueTwo; I need to get the name of myEnumInstance via reflection from another class . I tried:

问题 Closed. This question is not reproducible or was caused by typos. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 4 years ago . Improve this question Say I have this enum: public enum MyEnum{ ValueOne = 1, ValueTwo = 2, ValueThree = 3 } And then this field/variable: public MyEnum myEnumInstance = MyEnum.ValueTwo; I need to get the name of myEnumInstance via reflection from another class . I tried: