reference

问题 string foo() { return "hello"; } int main() { //below should be illegal for binding a non-const (lvalue) reference to a rvalue string& tem = foo(); //below should be the correct one as only const reference can be bind to rvalue(most important const) const string& constTem = foo(); } GCC is the good one to give a compile error : invalid initialization of non-const reference of type std::string& from a temporary of type std::string VS2008 is not too bad as at least it gives a compile warning :

问题 string foo() { return "hello"; } int main() { //below should be illegal for binding a non-const (lvalue) reference to a rvalue string& tem = foo(); //below should be the correct one as only const reference can be bind to rvalue(most important const) const string& constTem = foo(); } GCC is the good one to give a compile error : invalid initialization of non-const reference of type std::string& from a temporary of type std::string VS2008 is not too bad as at least it gives a compile warning :

问题 *because the child is released within the dealloc of the parent, wouldn't that imply that the parent object still exists, and that the child's weak reference back to the parent should still be valid? I have a parent object, a NSViewController subclass, which owns another object, a NSWindowController subclass. @interface MyViewController : NSViewController @property (strong) MyWindowController *myWindowController; The NSWindowController subclass has a weak reference back to the

问题 *because the child is released within the dealloc of the parent, wouldn't that imply that the parent object still exists, and that the child's weak reference back to the parent should still be valid? I have a parent object, a NSViewController subclass, which owns another object, a NSWindowController subclass. @interface MyViewController : NSViewController @property (strong) MyWindowController *myWindowController; The NSWindowController subclass has a weak reference back to the

问题 I'd like to place a formula 3 cells to the left of the last column. Is there a way to do this? Perhaps through a column address? lc = .Cells(3, Columns.count).End(xlToLeft).Column .Cells(3, lc + 3).Formula = "=CountCcolor(E3:N" & lrPT & ", " & .Cells(0, lc + 2) & "3)" Regards, 回答1: lc + 3 is three columns to the right, not the left but that is almost assuredly a typo. This should square your formula construction away. lc = .Cells(3, Columns.count).End(xlToLeft).Column .Cells(3, lc + 3)

问题 I have a collection of Movie objects in a HashSet<Movie> . Movie type has properties such has Name , Year , Length , Genre , etc. I also has user profiles stored in individual files. I want to have each user to have a number of favorite movies. But I am not sure how to "connect"/reference these movies inside the user profiles. Should I just rely on names? What's the best way to store the favorite movies in these individual user profiles? I can't think of any other than using names, but this

问题 So i am working on the same WPF project on two different computers. I am using bitbucket (git) to push and pull to an online repository. Now ive just collected the project on a new computer and want to run the program. but i get the following error: The invocation of the constructor on type 'Henvendelser.MainWindow' that matches the specified binding constraints threw an exception.' Line number '5' and line position '9'. now this is my XML: <Window x:Class="Henvendelser.MainWindow" xmlns=

问题 I'm new to ASP.NET Web API and want to make HttpResponseMessage instance from a utility class I made. Then I made very simple class. But following compile error occurred. CS0246: The type or namespace name 'HttpResponseMessage' could not be found (are you missing a using directive or an assembly reference?) using System; using System.Collections.Generic; using System.Linq; using System.Net.Http; using System.Web; namespace myapplication.App_Code.Utils { public class HttpUtility { // compile

问题 Currently : I have the following Using in my program. using Mtx; which allows me to use Mtx.* properties. It refers to a file in "Externals" folder. Path is : Externals/Mtx.dll Needed : However, for debugging purposes, I'd like to now have the whole mtx solution in external and use it. Path is : Externals/Mtx/(solution in there with all folders) How can I do so, so instead of Using refers to the Mtx.dll , it now refers to the solution and build it has part of its own? 回答1: I think that you

问题 I want to use the value of a cell in a reference formula. For example: I have a sheet with name '815108' which has all the data I need. Now in the sheet1(new sheet), in A1 I type in ='815108'!A3 which gets the data from A3 in the sheet '815108'. But the question I have - In my new sheet 815108 is a defined attribute (For example: SO = 815108 is defined in cell F5.) Instead of using '815108'!A3 I want to use the location in the current sheet. I tried ='=F5'!A3 which doesn't work. Any help is