named-parameters

Previously, I worked with python. In Python I used named parameter(keyword argument) for function calls. Wikipedia page about named parameter tells that C++ doesn't support it. Why C++ doesn't support named parameter?. Does it support in future version of C++ standard? Why C++ doesn't support named parameter Because such feature has not been introduced to the standard. The feature didn't (and doesn't) exist in C either, which is what C++ was originally based on. Does it support in future version of C++ standard? Maybe. A proposal has been written for it. It depends on whether the proposal is

We're currently using .NET 3.5 and part of our application uses dynamic invocation (using MethodBase.Invoke ) I am wondering if it is possible to mix in Named Parameters (in .NET 4) with dynamic invocation, to perform something similar to: // Dictionary that holds parameter name --> object mapping var parameters = new Dictionary<string, object>(); // Add parameters .... // Invoke where each parameter will match the one from the method signature. methodInfo.Invoke(obj, parameters); Is there any API that allows this option out of the box? If not, is it possible to develop some solution to

I'm working on a Scala API (for Twilio, by the way) where operations have a pretty large amount of parameters and many of these have sensible default values. To reduce typing and increase usability, I've decided to use case classes with named and default arguments. For instance for the TwiML Gather verb: case class Gather(finishOnKey: Char = '#', numDigits: Int = Integer.MAX_VALUE, // Infinite callbackUrl: Option[String] = None, timeout: Int = 5 ) extends Verb The parameter of interest here is callbackUrl . It is the only parameter which is really optional in the sense that if no value is

I am trying to run the following code in VBScript but it is not compiling the last statement. Is it because VBScript doesn't allow named arguments? Filename_Argument = WScript.Arguments(0) Set objExcel = CreateObject("Excel.Application") objExcel.Visible = True Set objWorkbook = objExcel.Workbooks.Add() Workbooks.OpenText Filename:=Filename_Argument, Origin _ :=xlMSDOS, StartRow:=1, DataType:=xlDelimited, TextQualifier:= _ xlDoubleQuote, ConsecutiveDelimiter:=False, Tab:=False, Semicolon:=False _ , Comma:=False, Space:=False, Other:=True, OtherChar:="|", FieldInfo _ :=Array(Array(1, 1), Array

I would like to create a function that has optional arguments with default values def my_function(a = nil, b=nil, c=500) end and call the function with the arguments I would like to specify only my_function(b=100) How do I accomplish this in Ruby 1.9.2? You cannot do that (or something similar) in Ruby < 2.0. The best you could do is: def my_function(h = {}) h[:c] ||= 500 # Use h[:a], h[:b], h[:c] ... end my_function(b: 100) Arguments are bound to parameters like this: As long as there are unbound mandatory parameters at the beginning of the parameter list, bind arguments left-to-right As long

How would I specify a JPA query like: Query q = em.createQuery( "SELECT x FROM org.SomeTable x WHERE x.someString LIKE '%:someSymbol%'" ); followed by: q.setParameter("someSymbol", "someSubstring"); and not triggering a org.hibernate.QueryParameterException: could not locate named parameter [id] Much appreciated! How about Query q = em.createQuery( "SELECT x FROM org.SomeTable x WHERE x.someString LIKE :someSymbol" ); q.setParameter("someSymbol", "%someSubstring%"); I'm pretty sure I once solved your problem like that. For reference, you could also use CONCAT: like CONCAT('%', :someSymbol, '%'

So an optional parameter expected in the web POST request of an API I'm using is actually a reserved word in python too. So how do I name the param in my method call: example.webrequest(x=1,y=1,z=1,from=1) this fails with a syntax error due to 'from' being a keyword. How can I pass this in in such a way that no syntax error is encountered? Pass it as a dict. func(**{'as': 'foo', 'from': 'bar'}) args = {'x':1, 'y':1, 'z':1, 'from':1} example.webrequest(**args) // dont use that library 来源： https://stackoverflow.com/questions/4179175/python-named-argument-is-keyword