variables

问题 In the following code , I am initializing a reference variable with a literal. class ABC { public: const int& a; ABC():a(43) { } void newfoo() { printf("NEWFOO %d",a); } }; int main() { ABC obj; obj.newfoo(); } The output of this program is NEWFOO 32767 which seems illogical when I know that the following code works just fine. int main() { const int& b=3; printf("%d",b); } What is happening here ? If compiler declares some temp variable during initializing of the reference variable , then isn

问题 I know we are able to use ternary for attr but I am wondering if we can do it with plain text? let's say I have something like this button.btn.btn-round.btn-info | if image | Change Image else | Add Image the button will have the text either Change Image or Add image if image variable exists Is this possible to use ternary? Thanks in advance for any help and suggestions 回答1: Yes, it's absolutely possible. Just use the equals sign at the end of the element definition to get pug to evaluate

问题 I am trying to pass a variable from an asp project (written in c#) to a desktop c# application. I know using Javascript you can use a JavaScriptSerializer, but is there an equivalent for asp? 回答1: Depends on what you want to send back to the app or what is already being sent back by the server. i.e. let's say the result of a web page request were the "parameters" you speak of (you're not very clear, in the context of http and web communications). An ASP page can pass back the data to an app

问题 I am trying to copy values from sheet1 to sheet2. The number of rows of sheet1 varies so I need to store it in a variable. I need something like: Worksheets("Sheet1").Range("A2:Ab").Select , where "b" is a variable that stores the number of rows in Sheet1. Thank you. 回答1: You can actually store the UsedRange of a worksheet. Or just copy to another sheet directly. e.g. Set oWS1 = Worksheets("Sheet1") Set oWS2 = Worksheets("Sheet2") oWS2.UsedRange.Clear ' Clear used range in Sheet2 oWS1

问题 I'm changing my multiline variables to Template Literals and it's amazing, but then I noticed that the indents I do are converted (minified) into \n with the indentation I did on the original code. How can I avoid that? Ex: var $div = $(`<div class='proj' id='projects'> <div class='bot-nav'>${txt}</div> </div>`); It's converted to: var $div = $("<div class='proj' id='projects'>\n <div class='bot-nav'>"+txt+"</div>\n </div>"); And I want this: var $div = $("<div class='proj' id='projects'><div

问题 I'd like to clear all variables from workspace, but with some exceptions defined by regular expressions. The function clear has an additional option -regexp clear -regexp expr1 ... exprN clears all variables that match any of the regular expressions listed. This option only clears variables. So I'm looking for the opposite. Also there is clearvars -regexp p1 p2 ... clears all variables that match regular expression patterns p1, p2, and so on. clearvars -except v1 v2 ... clears all variables

问题 I'd like to clear all variables from workspace, but with some exceptions defined by regular expressions. The function clear has an additional option -regexp clear -regexp expr1 ... exprN clears all variables that match any of the regular expressions listed. This option only clears variables. So I'm looking for the opposite. Also there is clearvars -regexp p1 p2 ... clears all variables that match regular expression patterns p1, p2, and so on. clearvars -except v1 v2 ... clears all variables

问题 I'd like to clear all variables from workspace, but with some exceptions defined by regular expressions. The function clear has an additional option -regexp clear -regexp expr1 ... exprN clears all variables that match any of the regular expressions listed. This option only clears variables. So I'm looking for the opposite. Also there is clearvars -regexp p1 p2 ... clears all variables that match regular expression patterns p1, p2, and so on. clearvars -except v1 v2 ... clears all variables

问题 Let's say I have 3 files in group_vars: abc.yml all.yml xyz.yml And the same variable defined in them: - my_var: abc - my_var: all - my_var: xyz Ansible documentation says: Within any section, redefining a var will overwrite the previous instance. If multiple groups have the same variable, the last one loaded wins. If you define a variable twice in a play’s vars: section, the 2nd one wins. Does it mean that load order is alphabetical one and abc.yml has the lowest priority, whereas xyz.yml

问题 I am hoping that someone will be able to help me out, basically I have a text file that I need to split based on a variable that will be contained within the file….. I have added below an example of how the source file would look… What I need to do is ignore the header and footer and then split the file in to separate files based on the second delimiter so for the first row this would be “1001” the files should group all of the matching references into the file and then apply a header and