reference

问题 I have the code below. I want to change $b to use it again with values. If I do so it changes $a as well. How can I assign a value to $b again after previously assigning it as a reference to $a? $a = 1; $b = &$a; // later $b = null; 回答1: See explanation inline $a = 1; // Initialize it $b = &$a; // Now $b and $a becomes same variable with just 2 different names unset($b); // $b name is gone, vanished from the context But $a is still available $b = 2; // Now $b is just like a new variable with

问题 My question is related to I didn't find "ZipFile" class in the "System.IO.Compression" namespace But I have referenced the DLL's for my 4.5.1 webforms project: Properties of my project give me: Target framework: .Net Framework 4.5.1. and the web.config: <compilation debug="true" targetFramework="4.5" /> What am I missing? The solution was to manually reference the assemblies in the web.config But why? Why wasn't the checkbox in the add reference dialog insufficient? <assemblies> <add assembly

问题 sorry for asking you a stupid question, but I just can't figure out why I keep on getting this output. So here is my code: #include <cstdio> #include <iostream> using namespace std; unsigned n = 4242; int getRemainderOf(int m, int n, int& quotient); static int l = 0; int main() { int quotient; // the value of which should be changed after calling the func. for(int i=-1; i<=1; ++i) { for(int j=-1; j<=1; ++j) { if( i && j ) { cout << "("<< i*3 << "," << j*7 << ") " <<( getRemainderOf(i*3, 7*j,

问题 Is it possible to reference resource files (e.g. layout files) in javadoc? I could not find this in the developer docs. 回答1: Yup it is, In your javadoc: {@link com.yourApp.R.layout#layoutName} 回答2: I've used # {@link R.layout#dialog_player_info} instead of a dot {@link R.layout.dialog_player_info} And now it's all OK. Before I was getting this error in Android Studio Cannot resolve symbol 'R.layout.dialog_player_info' less... (Ctrl+F1) This inspection points out unresolved references inside

问题 I created a homemade assembly and I think I installed it correctly in the GAC using the .Net 2.0 configuration tool (mscorcfg.msu) However, when I want to reference it in visual studio, where do I find it? ( I know, I should not use the GAC anyway, but indulge me ;-)) EDIT: I did not ask the question clear enough: After installing the assembly to the GAC, it does not show up on the .NET tab of the Project-Add Reference menu. 回答1: The add reference dialog actually looks at the registry, in

问题 I'm trying to implement a zip function. zip 's parameters are each wrapped<Ti> , where Ti varies from parameter to parameter. zip takes these wrapped<Ti> s and produces a wrapped<tuple<T1&,T2&,...TN&>> , or in other words a wrapped tuple of references to its parameters. The references should preserve const -ness. Here's my first stab at zip with one parameter, which doesn't work in general: #include <utility> #include <tuple> // implement forward_as_tuple as it is missing on my system

问题 I haven't seemed to run into a problem yet, but I'm trying to make sure I'm using some best practices. Say I have a UITableViewController with a data source of an NSArray of MyObject objects. So in my UITableViewController I declare my data source like: @property (strong, nonatomic) NSArray *dataSource; Then after I touch a cell I want to push a new view that shows a detail view of something, using that cell's MyObject. So in the new UIViewController I have this: @property (strong, nonatomic)

问题 I am developing an iPhone app and there will be a Full as well as a Lite version of that app. In order get both bundles from the same source code and xcode project I added another target to the xcode project. Now, I want to have the Lite target copy only a subset of the resource files to the bundle. But, xcode won't simply let me delete individual files from the "Copy Files to Bundle" build step, since I imported all my resources as folder references. I need this in order to maintain a

问题 This question already has answers here : Closed 6 years ago . Possible Duplicate: Returning the address of local or temporary variable Can a local variable’s memory be accessed outside its scope? Even knowing what happens as a result of the following snips it would be helpful to understand how it is happening. Four questions follow. Given: int& foo() { int i = 1; return i; } And knowing that in the following a reference to the local named i is de-referenced into a temp that is assigned to

问题 I've come across a strange issue that I've just now noticed. If you have a solution with 3 projects ** NOTE Edited after discussion ** Project LibA - Has a ClassA namespace LibA { public class ClassA { public override string ToString() { return "The logic in class A!"; } } } Project LibB - Has a ClassB using LibA; namespace LibB { public class ClassB { public ClassA a; public ClassB() { a = new ClassA(); } public object Foo() { return a; } } } Project LibC - Has a ClassC using LibB; namespace