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Static member is not accessible error on navbar component


Static member is not accessible error on navbar component

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Static member is not accessible error on navbar component
Tag : angular , By : user183275
Date : January 11 2021, 03:32 PM

this one helps. you don't need to inject AuthService,in the component just create a property to get the value from AuthService.isLoggedIn
export class NavbarComponent implements OnInit {

  constructor(){}

  get isLoggedIn () {
   return AuthService.isLoggedIn 
  }
}
<nav *ngIf="!isLoggedIn" class="navbar navbar-expand-lg navbar-dark" data-navbar="smart">
</nav>

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Web user control member variable not accessible when not declared static


Tag : chash , By : KingGuppy
Date : March 29 2020, 07:55 AM
Hope this helps I suspect the problem isn't that it can't be accessed, at all. I strongly suspect that the problem is that you've got two different requests, and therefore two different instances of WaveFilePlayer - so when you're executing ButtonPlay_Click, the files variable will be null unless you've written some code to persist it between requests.
Options here would be view state or some server-side session. You should not use a static variable, as that will basically mean you've got a single variable shared between all requests (for all users).

c++ error: invalid use of member 'calls_object::OBJECT' in static member function


Tag : cpp , By : scott.sizemore
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , I got the following error from the code below. , This function:
static void windows_function()
{
    OBJECT->call();
}
~calls_object() 
{ 
    delete object; // DON'T FORGET THIS!
}

Understanding error with taking address of non-static member to form pointer to member function?


Tag : cpp , By : Josh
Date : March 29 2020, 07:55 AM
hope this fix your issue Pointers to non-static member functions cannot be converted to plain function pointers. A void (MyClass::*)() requires a MyClass object to operate on. Raw pointers can't hold any sort of state though, so there's no way for a void(*)() to store the information about which MyClass object to operate on.
Luckily, the standard library has a class template designed for just this purpose: std::function. std::function is a more-or-less drop-in replacement for raw function pointers, but it can hold any type of callable object that's compatible with a given signature. That means it can hold the state required to call back to a specific instance of a class:
class State {
private:
  std::function<void()> on_enter;
  std::function<void()> func;
  std::function<void()> on_exit;

public:
  State(std::function<void()> on_enter, std::function<void()> func, std::function<void()> on_exit)
    : on_enter{std::move(on_enter)},
      func{std::move(func)},
      on_exit{std::move(on_exit)}
  {}

  void do_something() {
    on_enter();
    // stuff
    func();
    // more stuff
    on_exit();
  }
};

class MyClass {
private:
  void func_on_enter() {}
  void func() {}
  void func_on_exit(){}

  State state_a;

public:
  MyClass()
    : state_a([this]() { func_on_enter(); },
              [this]() { func(); },
              [this]() { func_on_exit(); })
  {}
};

Why does this static const int member variable appear to be accessible publicly in array definition?


Tag : cpp , By : changke
Date : March 29 2020, 07:55 AM
around this issue I make the following declarations: , This definition
Servo Servo::servos[Servo::maxServos]; //Array definition
Servo Servo::servos[maxServos]; //Array definition

error C2355: 'this' : can only be referenced inside non-static member functions or non-static data member initializers


Tag : cpp , By : kema
Date : March 29 2020, 07:55 AM
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