syntax

问题 I know there are lots of posts regarding this, but nothing worked for me. I am trying to run this command line in PowerShell: C:/Program Files (x86)/ClamWin/bin/clamd.exe --install I have this in PowerShell: &"C:/Program Files (x86)/ClamWin/bin/clamd.exe --install" But all this does is execute clamd.exe , ignoring the --install parameter How can I get the full command line to run? 回答1: Josef Z's comment on the question provides the solution: & "C:/Program Files (x86)/ClamWin/bin/clamd.exe" -

问题 This question already has answers here : How do I call New-Object for a constructor which takes a single array parameter? (2 answers) Closed 2 years ago . It seems that there is a bug in the O-O support in PowerShell . When instantiating an object of a class with a constructor that accepts a List< T > and this is the only parameter , PowerShell cannot find a proper constructor. Code sample: class MyClass { MyClass( #[int]$i, [System.Collections.Generic.List[string]] $theparams) { } }

问题 This question already has answers here : How do I call New-Object for a constructor which takes a single array parameter? (2 answers) Closed 2 years ago . It seems that there is a bug in the O-O support in PowerShell . When instantiating an object of a class with a constructor that accepts a List< T > and this is the only parameter , PowerShell cannot find a proper constructor. Code sample: class MyClass { MyClass( #[int]$i, [System.Collections.Generic.List[string]] $theparams) { } }

问题 In Python, a variable or literal followed by a hanging comma is a one- tuple : 1, # (1,) ...and a series of comma-separated variables/literals (whether or not they are followed by a hanging comma) is also a tuple : 1,2, # (1,2) 1,2 # (1,2) However, inside a callable/function, this syntax is treated differently, because the comma is used for separation of arguments: bool(5>6,) # False - 5>6 == False bool((5>6,)) # True - (5>6,) is a non-empty tuple (always True - contents ignored) The first

问题 Here is my Go program. package main import ( "fmt" ) type Person struct { Name string } func main() { p := &Person{"Jack"} // The following statement makes sense. We dereference the // pointer to reach the Person object and then retrieve its Name // field. fmt.Println((*p).Name) // But the following statement does not make sense. How does // this code work by retrieving the Name field directly from the // pointer without dereferencing it? fmt.Println(p.Name) } Here is the output. $ go run foo

问题 Today I saw this code: void CameraTree::dragMoveEvent(QDragMoveEvent *event) { QTreeWidget:dragMoveEvent(event); } I think the above code is wrong. But: void CameraTree::dragMoveEvent(QDragMoveEvent *event) { dragMoveEvent(event);//infinite recursion??? } void CameraTree::dragMoveEvent(QDragMoveEvent *event) { QTreeWidget::dragMoveEvent(event); // I understand is called dragMoveEvent in class QTreeWidget. // But dragMoveEvent is not static?? } And only warned "unused label QTreeWidget",

问题 Is there any way to call a function that is inside of a namespace without declaring the class inside c#. For Example, if I had 2 methods that are the exact same and should be used in all of my C# projects, is there any way to just take those functions and make it into a dll and just say 'Using myTwoMethods' on top and start using the methods without declaring the class? Right now, I do: MyClass.MyMethod(); I want to do: MyMethod(); Thanks, Rohit 回答1: You can't declare methods outside of a

问题 I was reading and reviewing the following site and had a question. https://www.geeksforgeeks.org/angle-bracket-in-java-with-examples/ In the explanations below they show class definitions followed by <T> and then when actually implementing these classes they use different types such as or as the parameters. My question is: is the '' notation actually a defined syntax in Java? In particular, is the T a necessary thing in order to define a "Generic"? And then does it basically mean that the

问题 I was reading and reviewing the following site and had a question. https://www.geeksforgeeks.org/angle-bracket-in-java-with-examples/ In the explanations below they show class definitions followed by <T> and then when actually implementing these classes they use different types such as or as the parameters. My question is: is the '' notation actually a defined syntax in Java? In particular, is the T a necessary thing in order to define a "Generic"? And then does it basically mean that the

问题 I would like to know what the a.*, c.name, ... a.access etc means. In other words, what exactly am I referring to when I add a letter before the dot and the funciton of the dot. Here is an example of code where I found this occurrence: $query = "SELECT a.*, c.name as categoryname,c.id as categoryid, ". "c.alias as categoryalias, c.params as categoryparams". " FROM #__k2_items as a". " LEFT JOIN #__k2_categories c ON c.id = a.catid"; $query .= " WHERE a.published = 1" ." AND a.access <= {$aid}