copy

问题 I'd like to take a UITextView and allow the user to enter text into it and then trigger a copy of the contents onto a quartz bitmap context. Does anyone know how I can perform this copy action? Should I override the drawRect method and call [super drawRect] and then take the resulting context and copy it? If so, does anyone have any reference to sample code to copy from one context to another? Update: from reading the link in the answer below, I put together this much to attempt to copy my

问题 I wonder is there any good way to extract blocks/ROIs from Eigen::SparseMatrix? More precisely, what I want to extract is inner vectors . What I want to do is like: typedef Eigen::SparseMatrix<double,Eigen::RowMajor> SpMat; // Prepare some sparse matrix SpMat spmat; // Extract lines from it const SpMat& row_i = spmat.innerVector(i); const SpMat& row_j = spmat.innerVector(j); // Some calculation with row_i and row_j... As I tested, the data of row_i and row_j is copied (!!) from spmat .

问题 I would like to copy some files in Gradle and the resulting files should not contain any blank lines, i.e., the blank lines are not copied. I assume that can be done with filter(...) and maybe with the TokenFilter from ant. However, I am not sure how to the syntax would look like. Thanks. 回答1: Gradle uses Ant for filtering, because of its powerful implementation. For example, you can use the LineContainsRegExp Ant filter to filter out any line that is only empty or whitespaces. The

问题 I have a simple script which copies a file from one SMB mount to another. The source file system is the same, but the web server is different. I'm using PHP to process the file by copying it to a temp directory, then performing additional tasks on it. This setup was working at one point in time but it seems that it's no longer working correctly. Can someone point me in the right direction? fstab mounts : //192.168.0.x/share /media/folder smbfs username=user,password=mypass //192.168.0.x

问题 I am currently using the zclip/jquery code to allow copying to the clipboard. It is currently attached to a span button. It seems to use a swf file over the button to provide the flash based copy to clipboard feature. The problem that I have is that when I dynamically add new elements to the page, the button position moves down but the SWF position stays the same. Is there anything I can do to have the zclip "follow" the button? Zclip snippet below: $("#copyToClip").zclip({ path:'include

问题 I have got the array containing some data, say, a header and a real data. I need to pass the data contained in the array to a method, but I definitely want to avoid copying it to another array. I thought of something like ArraySegment, but it seems not to work in my case (or maybe I'm wrong?). So, how to pass a part of an array to a method, as it was an array itself? Thank you for your replies! Cheers 回答1: Skip and Take: var subArray = array.Skip(5).Take(10); 回答2: If you want to stick to just

问题 I met a quiz saying that the code in line 18 below is ill-formed because "It is ill-formed to use an implicitly defined assignment operator when one of the members that will need to be copied is a reference. " I couldn't understand that. Why reference could not be copied? Why Line 16 is legal? Line 16 is quite similar to line 18, a copy constructor still need to do the copy, right? 1 #include <iostream> 2 3 struct A 4 { 5 A(int& var) : r(var) {} 6 7 int &r; 8 }; 9 10 int main(int argc, char**

问题 I'm having a little trouble understanding the pass-by-reference properties of data.table . Some operations seem to 'break' the reference, and I'd like to understand exactly what's happening. On creating a data.table from another data.table (via <- , then updating the new table by := , the original table is also altered. This is expected, as per: ?data.table::copy and stackoverflow: pass-by-reference-the-operator-in-the-data-table-package Here's an example: library(data.table) DT <- data.table

问题 I wrote the following code: class MyObjectHolder { public: std::vector<int> getMyObject() const { return myObject; } private: std::vector<int> myObject; }; At some point of my program I attempt to use the getMyObject method and use only const methods on the retrieved object: const std::vector<int> myObject = myObjectHolder.getMyObject(); myObject.size(); int a = myObject.front(); Now, is it possible that the compiler will optimize this code so that no copies of the std::vector<int> are done?

问题 I'm a bit puzzled by question 4 in section 3.36 of "Advanced R" (https://adv-r.hadley.nz/names-values.html). The chapter that I have linked to explains the conventions I've used in the images I attached. I'll summarize them briefly. For those not familiar with the book and those who do not feel like clicking on the link and reading the authors description of diagrams similar to mine, I've added a brief explanation of the conventions I've used in the image below the rest of this post. What