What does the "R + 'static" syntax mean in "F: FnOnce(&mut Resource<S>) -> R + 'static"

What does the "R + 'static" syntax mean in "F: FnOnce(&mut Resource<S>) -> R + 'static"

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What does the "R + 'static" syntax mean in "F: FnOnce(&mut Resource<S>) -> R + 'static"
Tag : development , By : Steve O.
Date : November 29 2020, 04:01 AM

hop of those help? R is the return value of f.
If you look inside the actix-web source, you can see that this value is discarded/not used. I think this is mostly a convenience thing; rather than specifying a () return value, actix is making it easy by not caring what you return from your f.

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How to bind "OnDataBound" event of "DropDownList" in declarative syntax to a static method in some o

Tag : chash , By : RyanMcG
Date : March 29 2020, 07:55 AM
this will help This is not possible. The event handler must be declared in the code behind.

Including a section with "dynamic prototypes" in a static Tableview with "static cells"

Tag : objective-c , By : TheDave1022
Date : March 29 2020, 07:55 AM
I wish did fix the issue. I have a partial solution for this problem
In the Table view data source methods I return the superclasses result for the static cells, for the dynamic cells I return the needed dynamic values.
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
  switch (section) 
      return  [super tableView:tableView numberOfRowsInSection:section];


- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
  static NSString *CellIdentifier = @"ItemCellBasic";
  UITableViewCell *cell; 

  switch (indexPath.section)
      return [super tableView:tableView cellForRowAtIndexPath:indexPath];

      cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
      if (!cell) 
      {  cell=[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] ;

      return cell;    


Difference between "load static from staticfiles" and "django.core.context_processors.static" in Dja

Tag : django , By : user143729
Date : March 29 2020, 07:55 AM
Does that help Both methods are essentially the same when using Django's default StaticFilesStorage. Both methods are ignorant of any actual files. Both methods just join together the STATIC_URL setting and the actual file path.
There can be a difference when using a custom file storage backend. If you need flexibility, e.g. if some files are stored with different static urls, you can override the backend's url method to return an url based on the actual location of the file. That won't be possible using the STATIC_URL setting. However, this situation is quite rare: most servers store their static files in a single location either on the same server or with a third-party service.

Should I explicitly declare static methods in Java 8 interfaces as "public static" instead of "static&quo

Tag : development , By : Suresh S
Date : March 29 2020, 07:55 AM
wish helps you The Java 8 Language specification states clearly that:

Difference between "public static" and "private static" for storing simple data. What is better?

Tag : java , By : alexmajy
Date : March 29 2020, 07:55 AM
like below fixes the issue Simply spoken:
Avoid static in the first place Avoid exposing internal state, too
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