I'm trying to implement specification in one of my use cases.
As u can see in the function dateValueBetween, I'm trying to get from the root the transient property valueDate. But when calling this service with real data it give the error downside.
My original problem was how to call the builder.between method but the value I have is a String value and need to be parsed.
but it seems that the first argument need to be a property of the table and not a function.
How can I achieve my goal?
I wondering how to get object property value given name of property in string in Scala? I saw examples when you get all fields of object using Reflection and iterate over it. But is it possible to call it without iteration? Or may be there is a way to pass object.field to another function without evaluation and evaluate it there and return result?
Kolmar comment give me right direction to call by name function.
func displaySomething(something:UIView) {} -> "displaySomething"
I am crazy about seletor type parameter in Swift. It just pass a string of the function name! I want to implement a function that pass in a function and give out a string, so I can use this function when I want pass a "selector type".
Swift does not currently include runtime APIs to make this possible.
If you're interested in a feature to do this, you can file a feature request at http://bugreport.apple.com.
I'm using Eclipse JDT AST to parse a given java source code. While parsing the code, when it hits a method invocation, I want to find out whether that particular method returns or sets a value of an instance variable (basically to find out whether the callee method is a getter/setter of the same class of caller method).
E.g.:
public void test(){
//when parsing the following line I want to check whether "getName"
//returns a value of an instance variable.
String x = getName();
//when parsing the following line I want to check whether "setName"
//sets the value of an instance variable.
setName("some-name");
}
I've used the AST plugin also find out a possible path which would help me to refer it from the API, but couldn't.
Please let me know whether this is possible and if so, which approach that would help me to get the required information.
Don't think that there is an api which tells you whether a method is a getter or a setter.
You will have to write code to do this. For a getter, you can probably simply check if the last statement in the method is a return statement which returns an instance variable.
Normally, to call a method from its reference, it should go something like below:
$methodref->(#args)
But when invoke a method from its reference returned from "can", it seems inconsistent.
$methodref = $my_obj->can(my_method);
$my_obj->$methodref(#args) if $methodref; # why it isn't $my_obj->$methodref->(#args)?
Can someone please shed some light on this?
Thanks,
CC
The reason is that the object has to be the first thing passed in to the function. This is automatically done for you if you make a method call. But $methodref->($my_obj, #args) will also work.
The CODE ref returned by can doesn’t have an object associated with it once that can is done. That’s why you still need to use an object as an invocant.
Note that this is dangerous, because there is no longer any guarantee that this is method that is supposed to be called on that object. I suppose you might do something like this:
$objmethref = $my_obj->can("methname") && sub { $my_obj->methname(#_) };
# then later
$objmethref->(#args);
but I’m not sure what it is you really want to do.
$my_obj->$methodref->(#args)
is
( $my_obj->$methodref() )->(#args)
In other words, it would call the method with no args, and attempt to use the result as a function reference. It's not what you want at all
The obvious means of calling it is
$methodref->($my_obj, #args)
but Perl provides a syntax that looks like a method-call for your pleasure.
$my_obj->$methodref(#args)
$methodref->(#args) is a function call, not a method call, so won't have the object automatically passed.
$my_obj->$methodref->(#args) would call $methodref with no parameters other than the object parameter, and use its return value as a coderef, calling that and passing it the indicated args.