copy | 易学教程

How does copy constructor work?

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问题 How does a copy constructor work in c++ Error 1 error C2064: term does not evaluate to a function taking 1 arguments c:\users\thuan\dropbox\homework\css 342\lab2\lab2\lab2\lab2.cpp 26 #include "intset.h" int main() { IntSet object1; IntSet object2(9); object1(object2); //error here return 0; } //constructor IntSet::IntSet(int a, int b, int c, int d, int e) { numOfArray++; int tempArray[] = {a, b, c, d, e}; size = determineHighest(tempArray) + 1; arrayPtr = new bool[size](); for (int i = 0; i

Copying files based on date modified in batch file

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问题 I am trying to copy files from one directory to another using a DOS batch script. The files I want to copy are the 4 or 3 latest files. That number will be static, but yet to be determined. Is there anyway to copy based on date modified? Thank you 回答1: You could: 1) have the dir command sort files in the descending order of date modified; 2) use the output of the dir command in a `for loop to copy the corresponding files; 3) count to 3 (or 4) in the for loop to limit the number of files

Invalid Argument error when copying data from device to host

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问题 I am having problems copying data from my device back to the host. My data are arranged in a struct: typedef struct Array2D { double* arr; int rows; int cols; } Array2D; arr is a 'flat' array. rows and cols describes the dimensions. The code below shows how I am trying to copy the data back to the host: h_output = (Array2D*) malloc(sizeof(Array2D)); cudaMemcpy(h_output, d_output, sizeof(Array2D), cudaMemcpyDeviceToHost); double* h_arr = (double*) malloc(h_output->cols*h_output->rows*sizeof

The “trait Clone is is not implemented” when deriving the trait Copy for Enum

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The following code: #[derive(Copy)] enum MyEnum { Test } Is giving me this error: error: the trait core::clone::Clone is not implemented for the type MyEnum [E0277] Why is that the case, and how do I fix it? The Copy trait is a subtrait of Clone , so you always need to implement Clone if you implement Copy : #[derive(Copy, Clone)] enum MyEnum { Test } This makes sense, as both Copy and Clone are ways of duplicating an existing object, but with different semantics. Copy can duplicate an object by just copying the bits that make up the object (like memcpy in C). Clone can be more expensive, and

How to move folder/files with path names > 255 characters in Windows 8.1? [closed]

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问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 3 years ago . How can you copy/move a folder or file with path name length > 255 on windows? I have looked around for ages, and the only possible way I have found is to use the subst method. I wish I didn't have to mess about with this. I simply want to copy/move a file or directory, X , to location Y . I'm fine with making a

Msbuild copy to several locations based on list of destination parameter?

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问题 I got a directory I want to copy to a number of locations. Say I have home.aspx I want to copy it to abc/home.aspx def/home.aspx ghi/home.aspx so two questions for me: How do I define the list abc, def, ghi? How do I execute my Copy task with each element of this list? 回答1: Here is an actual example that I put together that shows what you were looking for: <?xml version="1.0" encoding="utf-8"?> <Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003" DefaultTargets="Test"

Can Visual Studio 2010 automatically copy a compiled file to another directory?

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I have two projects, one VB6 project which compiles to an EXE and one MSVC++2010 project which compiles to a DLL. The DLL needs to be in the same folder as the EXE file in order to work. Can I have Visual Studio 2010 automatically copy the compiled DLL to the VB6 project folder after a compilation? JaredPar The easiest way to set this up is to use a post build event. These run once a build is successfully completed and has a set of handy macros to make access to common outputs, like compiled files, very easy For example. Here are the steps to a compiled DLL / EXE into c:\temp Right Click on

Detecting whether a file is complete or partial in PHP

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In this system, SFTP will be used to upload large video files to a specific directory on the server. I am writing a PHP script that will be used to copy completely uploaded files to another directory. My question is, what is a good way to tell if a file is completely uploaded or not? I considered taking note of the file size, sleeping the script for a few seconds, reading the size again, and comparing the two numbers. But this seems very kludgy. In theory, in case you are allowed to run system commands from PHP you can try to get the pids of your sftp server processes with pidof command and

How do you create a copy of an UIImageView instance?

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How do I create a copy of an UIImageView instance that can be manipulated independently of the first instance? I've tried UIImageView *tempCopy = [instance copy] but it crashes. Is there another way? It probably crashes because UIImageView doesn't conform to the NSCopying protocol. So do it yourself: instantiate a new UIImageView and set any property from your original that you find of interest. UIImageView doesn't conform to NSCopying , but it does conform to NSCoding . Archive your view, and then de-archive it to get a brand new copy. For the lazily inclined, this looks like: NSData *archive

Create file in resources/source folder in java programmatically?

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I have two resources folders. src - here are my .java files resources - here are my resources files (images, .properties) organized in folders (packages). Is there a way to programmatically add another .properties file in that resources folder? I tried something like this: public static void savePropertiesToFile(Properties properties, File propertiesFile) throws IOException { FileOutputStream out = new FileOutputStream(propertiesFile); properties.store(out, null); out.close(); } and before that created: new File("/folderInResources/newProperties.properties"); But it looks for that path on the