parameter-passing

问题 I have a dynamic amount of arrays in a specific array. Let's call this specific array: FatherArray This FatherArray has a dynamic amount of arrays in it, right now for example: Child1Array , Child2Array . Next time it gets called it could have more or less than those 2 Child(number)Arrays. So I want to use the function array_intersect() with the arrays (children) of FatherArray as parameters, so like array_intersect(Child1Array,Child2Array). I don't have a clue how i could do this dynamically

问题 Using ionic, I am trying to have a use case to select from a list and return back to the original view with some value. I'ved already done most of the part except detecting it has returned to the original view and passing a value back to the original view. Here's so far what i'ved accomplished: button that goes to a list <button class="button button-block button-outline button-positive" ng-click="performselectUnit()"> Select Unit </button> this is the trigger to go to the new view with the

问题 I am new to RoR and I am following this tutorial on making a user authentication system from scratch: http://railscasts.com/episodes/250-authentication-from-scratch. I've been hung up on this error message all weekend: ArgumentError in SessionsController#create: wrong number of arguments (1 for 2). Here is the code from my sessions controller: class SessionsController < ApplicationController def new end def create user = User.authenticate(:email => params[:email], :password => params[

问题 I'm making a template class that is a wrapper around some type of data. I would like to be able to set / construct this class the same way as I set that data when it's not wrapped. Here's the basic idea: template<typename T> class WrapperClass{ public: T data; WrapperClass(const T& _data) : data( _data) {} // others stuff }; Now with something like an integer, I can do this: WrapperClass<int> wrapped_data = 1; But with a struct or class I don't know how: struct SomeStruct{ int a, b, c;

问题 I'm making a template class that is a wrapper around some type of data. I would like to be able to set / construct this class the same way as I set that data when it's not wrapped. Here's the basic idea: template<typename T> class WrapperClass{ public: T data; WrapperClass(const T& _data) : data( _data) {} // others stuff }; Now with something like an integer, I can do this: WrapperClass<int> wrapped_data = 1; But with a struct or class I don't know how: struct SomeStruct{ int a, b, c;

问题 Recently I decided to migrate one of my WPF Windows desktop apps written in C# and targeting .NET Framework 4.5 to the newest .NET Core 3.1 . All was good until I had to add support for single instance application while being able to pass any parameters from the second instance to the first running instance. My previous WPF implementation for single instance application was using System.Runtime.Remoting which is not available in .NET Core . Therefore I had to do something new. Below is the

问题 I have a function, and I want to pass an array of char* to it, but I don't want to create a variable just for doing that, like this: char *bar[]={"aa","bb","cc"}; foobar=foo(bar); To get around that, I tried this: foobar=foo({"aa","bb","cc"}); But it doesn't work. I also tried this: foobar=foo("aa\0bb\0cc"); It compiles with a warning and if I execute the program, it freezes. I tried playing a bit with asterisks and ampersands too but I couldn't get it to work properly. Is it even possible?

问题 I'm a college student studying OS. I'm trying to add my own system call in Linux kernel, and something is going wrong. My environment is stated below: Linux Kernel v.4.19.1 64-bit Ubuntu LTS 18.04.1 with Intel Core i5-4210M CPU on Oracle VirtualBox 5.2.18 64-bit Windows 10 Home 1803 as a host machine Since I'm working on x86_64 machine, I started with arch/x86/entry/syscalls/syscall_64.tbl . In Linux kernel v.4.19.1, the last entry is 334 common rseq __x64_sys_rseq so I added those three

问题 code_0: (calling foo without parentheses) function foo(){ console.log('hello world'); } setTimeout(foo, 2000); This is how code_0 was executed: start -> wait for 2 seconds -> 'hello world' displayed -> end code_1: (calling foo with parentheses) function foo(){ console.log('hello world'); } setTimeout(foo(), 2000); And this is how code_1 was executed: start -> 'hello world' displayed immediately -> wait for 2 seconds -> end Why would the program perform so differently when I called the

问题 code_0: (calling foo without parentheses) function foo(){ console.log('hello world'); } setTimeout(foo, 2000); This is how code_0 was executed: start -> wait for 2 seconds -> 'hello world' displayed -> end code_1: (calling foo with parentheses) function foo(){ console.log('hello world'); } setTimeout(foo(), 2000); And this is how code_1 was executed: start -> 'hello world' displayed immediately -> wait for 2 seconds -> end Why would the program perform so differently when I called the