constructor

问题 Research tells me that raising an event from the constructor itself is not feasible as the object may not be fully initialised... so where can I fire an event from as soon as the constructor has fired? 回答1: One thing you can do is add a method to handle additional post ctor tasks: Friend Class FooBar Public Sub New ' your code here End Sub Public Sub Create ' do anything you want End Sub End Class Elsewhere: Friend WithEvents Foo As Foobar ' ... Foo = New FooBar ' Foo doesnt exist until ctor

问题 Research tells me that raising an event from the constructor itself is not feasible as the object may not be fully initialised... so where can I fire an event from as soon as the constructor has fired? 回答1: One thing you can do is add a method to handle additional post ctor tasks: Friend Class FooBar Public Sub New ' your code here End Sub Public Sub Create ' do anything you want End Sub End Class Elsewhere: Friend WithEvents Foo As Foobar ' ... Foo = New FooBar ' Foo doesnt exist until ctor

问题 Research tells me that raising an event from the constructor itself is not feasible as the object may not be fully initialised... so where can I fire an event from as soon as the constructor has fired? 回答1: One thing you can do is add a method to handle additional post ctor tasks: Friend Class FooBar Public Sub New ' your code here End Sub Public Sub Create ' do anything you want End Sub End Class Elsewhere: Friend WithEvents Foo As Foobar ' ... Foo = New FooBar ' Foo doesnt exist until ctor

问题 Research tells me that raising an event from the constructor itself is not feasible as the object may not be fully initialised... so where can I fire an event from as soon as the constructor has fired? 回答1: One thing you can do is add a method to handle additional post ctor tasks: Friend Class FooBar Public Sub New ' your code here End Sub Public Sub Create ' do anything you want End Sub End Class Elsewhere: Friend WithEvents Foo As Foobar ' ... Foo = New FooBar ' Foo doesnt exist until ctor

问题 Hello I'm using inherited controllers. These are my controllers: -baseAdminController: <?php if (!defined('BASEPATH')) exit('No direct script access allowed'); class _BaseAdminController extends CI_Controller { public function __construct() { parent::__construct(); $this->load->library('session'); $calledFunction= $this->router->fetch_method(); if ($calledFunction!= 'loginView' && $calledFunction!= 'doLogin') { $this->checkSession(); } } public function checkSession() { if ($this->session-

问题 Hello I'm using inherited controllers. These are my controllers: -baseAdminController: <?php if (!defined('BASEPATH')) exit('No direct script access allowed'); class _BaseAdminController extends CI_Controller { public function __construct() { parent::__construct(); $this->load->library('session'); $calledFunction= $this->router->fetch_method(); if ($calledFunction!= 'loginView' && $calledFunction!= 'doLogin') { $this->checkSession(); } } public function checkSession() { if ($this->session-

问题 Hello I'm using inherited controllers. These are my controllers: -baseAdminController: <?php if (!defined('BASEPATH')) exit('No direct script access allowed'); class _BaseAdminController extends CI_Controller { public function __construct() { parent::__construct(); $this->load->library('session'); $calledFunction= $this->router->fetch_method(); if ($calledFunction!= 'loginView' && $calledFunction!= 'doLogin') { $this->checkSession(); } } public function checkSession() { if ($this->session-

问题 Forgive me if this has already been asked, I didn't find any answers to my specific question. I have a class in a library I'm making that I want certain classes to be able to create and destroy, and other classes to be able to access other public functions. Having a friend class is not what I want either as the friend class will get access to member variables and member functions which I don't want. I stumbled upon this idiom which almost works, except for the destructor since it can't take

问题 Problem I have a Matrix class that is able to do some math. It holds its data in a double nested std::array as a variable. I have a constructor that takes an array reference as a variadic template. I did this so i could add some SFINAE more easily (omitted here). #include <array> template <std::size_t N, std::size_t M, typename T> class Matrix{ public: template <typename... TArgs> Matrix(TArgs const(&&... rows)[M]) { // ?? } // ... private: std::array<std::array<T,M>, N> data; }; Question How

问题 Consider a diamond inheritance graph (i.e., virtual base class). We know from previous questions that on construction the most derived class directly calls the default (0-arg) constructor of the (virtual) base. But we also know from answers to the previous question (e.g., here that if the "middle" classes in the diamond have constructors that are used by the most-derived class and those constructors "call" non-default constructors of their (virtual) base class (via the initialization list)