copy

问题 In C++, how to make a copy of an existing vector pointing to the same allocated memory ? e.g : vector<int> o1; o1.push_back(1); vector<int> o2; //Make o2 share same memory as o1 o2[0]=2; cout << o1[0]; //display 2 EDIT : I haven't been clear about the objective : if o1 is allocated on the heap and gets destroyed, how can I create an object o2 that would point to the same allocated memory as o1 to keep it outside of the o1 scope ? 回答1: There is a boost::shared_array template. This however

问题 I am trying to copy a list to another list using AddRange or other ways but nothing seems to work correctly. No matter whatever way I try if, I modify the copied list it modifies the original list too. The only way it work if I copy using foreach loop. static void Main(string[] args) { var test = new List<Employee>{ new Employee { ID = "101", Name ="ABC1"}, new Employee{ID = "102", Name = "ABC2"}, new Employee{ ID = "103", Name = "ABC3"}}; var tets2 = new List<Employee>(test); tets2[0].ID =

问题 Example below: As you cansee the FBR00001 s/w beef bacon i just do the manual paste but the others i wanto to copy in easy way in one time not in manual.. can anyone please answer this below as i really need to learn this tricks.. many thanks Position Type FBR00001 S/W BEEF BACON FBR00001 S/W BEEF BACON FBR00001 S/W BEEF BACON FBR00001 S/W BEEF BACON FBR00001 S/W BEEF BACON FBR00001 S/W BEEF BACON FBR00001 S/W BEEF BACON FBR00006 S/W BEEF PASTRAMI OATMEAL PANINI Item Item Item Item Item Item

问题 I'm trying to copy an edge from a graph and add it to another (with all his vertices and properties), I make something like: if (!dataG.empty()) { auto const& gr = dataG.front(); // firslt graph in G_list auto ep = edges(gr).first; //first edge in gr vertex_t from = source(*ep, gr); vertex_t to = target(*ep, gr); boost::property_map<Graph, int VertexProperties::*>::type idmap = boost::get(&VertexProperties::id, testg); boost::property_map<Graph, int VertexProperties::*>::type labelmap = boost

问题 I would like to make a deep-copy all the instances of a class, but without copying the definitions and rules of given class. The intended use is, given I have the class "OriginalClass", its instances are the variables I am storing. While the program goes on, I want to be able to use previous "snapshots" of OriginalClass, from which I will only be using the values (I wont store new ones there, so no rules are needed to be inherited). The above simple example works, and is very similar to what

问题 I have problem with COPY command in Cassandra. I try move my old database on new server but when I use COPY FROM I receives error: Failed to import 1 rows: ParseError - invalid literal for int() with base 10: 'null', given up without retries Some fields are null and the need to keep this informations. CSV I created with COPY TO: COPY tabel TO './db.csv' WITH NULL='null' If I try make CSV without NULL='null' I receives error: Failed to import 1 rows: ParseError - invalid literal for int() with

问题 I'm trying to make a custom MSBuild script to build all solutions in our repository: <Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003"> <PropertyGroup> <SourceHome Condition=" '$(SourceHome)'=='' ">..\</SourceHome> <ToolsHome Condition=" '$(ToolsHome)'=='' ">.\Tools\</ToolsHome> <Configuration Condition=" '$(Configuration)'=='' ">Release</Configuration> <DestFolder Condition=" '$(DestFolder)'=='' ">.\$(Configuration)\</DestFolder> </PropertyGroup> <ItemGroup> <AllSolutions

问题 I am writing a program that copies certain files needed from one folder to another. However, I only want it to copy files that fit certain criteria, More specifically, it should only copy files that are not in the banned files, banned extensions, or banned folders list as stored in an array like this: Public BannedExtensions As String() = {".bak", ".bak2", ".cry", ".max", ".psd", "log", ".lib", "pdb", ".exp"} Public BannedFolders As String() = {"Tools", "Editor", "Code", "LogBackups",

问题 Is it possible to copy all the files contained recursively from a specific folder and its subfolders directly to a only one flat directory without respecting anymore the source hierarchy folders? 回答1: Of course that's possible. Why not? Counter = 0 Get-ChildItem -Path <Path> -Filter * -Recurse -File | Copy-Item -Destination <Destination Path> -PassThru | Foreach-Object{ $counter++ Rename-Item -Path $_.FullName -NewName ($_.BaseName + '_' + ("{0:000}" -f $Counter) + $_.Extension) } 来源： https:/

问题 thanks for taking the time to read this (sorry for the wall of text). Background Yes, this is a school project. No, I'm not asking you to do this for me. I've done all the work myself I've just been stumped by Java itself, not so much the problem. The project is about the basics of genetic programming. I randomly generate trees (which represent basic mathematical expressions), evaluate their fitness against data from the target function (x, y values), then manipulate the set by eliminating