Why is forwarding variadic parameters invalid?

Posted by awesomeyi on Stack Overflow See other posts from Stack Overflow or by awesomeyi
Published on 2014-06-04T21:15:21Z Indexed on 2014/06/04 21:24 UTC
Read the original article Hit count: 209

Filed under:

swift-language

|

variadic-functions

Consider the variadic function parameter:

func foo(bar:Int...) -> () { }

Here foo can accept multiple arguments, eg foo(5,4). I am curious about the type of Int... and its supported operations. For example, why is this invalid?

func foo2(bar2:Int...) -> () {
    foo(bar2);
}

Gives a error:

Could not find an overload for '_conversion' that accepts the supplied arguments

Why is forwarding variadic parameters invalid?

What is the "conversion" the compiler is complaining about?

© Stack Overflow or respective owner

Related posts about swift-language

How can Swift be so much faster than Objective-C in these comparisons?

as seen on Programmers - Search for 'Programmers'
Apple launched its new programming language Swift at WWDC14. In the presentation, they made some performance comparisons between Objective-C and Python. The following is a picture of one of their slides, of a comparison of those three languages performing some complex object sort: There was an… >>> More
What change in mindset are needed for a Jave/C# programmer when learning Swift?

as seen on Programmers - Search for 'Programmers'
Swift seem to fit into the same “space” as Java/C# as it was created to make it easier to create end user applications. It is also used to target smart phones like Java/C#. However reading it’s documentation it seems to come from anther universe, you could say it is from Jupiter while C#/Java is… >>> More
how to learn ios game development using swift.. good starting point?

as seen on Programmers - Search for 'Programmers'
I've published a simple app on the app store using objective-c. That was a good learning experience but I never grew to love the language. Later on I jumped into learning cocos2d in order to begin developing a game.. but objective-c always seemed really cumbersome to write. Eventually I put my… >>> More
Button postion not changing in View Controller. (Xcode)

as seen on Programmers - Search for 'Programmers'
I have a View controller in xcode 6 (beta 5). I have put 4 buttons in it through the Object library in a .xib. But when i open the app in iOS simulator the buttons are the right y position but not correct x-position()they are on the right edge. No matter where i move them in the xib they only change… >>> More
Will Swift or any upcoming Apple developer tools be incompatible with .xibs? [on hold]

as seen on Programmers - Search for 'Programmers'
I'm still letting the sudden announcement of a language change (Swift) sink in, and I'm wondering if the upcoming platform changes will still be highly compatible with using .xibs for interface development. I've used Storyboards in multiple production projects but I don't feel very productive with… >>> More

Related posts about variadic-functions

Qt and variadic functions

as seen on Stack Overflow - Search for 'Stack Overflow'
OK, before lecturing me on the use of C-style variadic functions in C++...everything else has turned out to require nothing short of rewriting the Qt MOC. What I'd like to know is whether or not you can have a "slot" in a Qt object that takes an arbitrary amount/type of arguments. The thing is that… >>> More
Odd behavior when recursively building a return type for variadic functions

as seen on Stack Overflow - Search for 'Stack Overflow'
This is probably going to be a really simple explanation, but I'm going to give as much backstory as possible in case I'm wrong. Advanced apologies for being so verbose. I'm using gcc4.5, and I realize the c++0x support is still somewhat experimental, but I'm going to act on the assumption that… >>> More
How can arguments to variadic functions be passed by reference in PHP?

as seen on Stack Overflow - Search for 'Stack Overflow'
Assuming it's possible, how would one pass arguments by reference to a variadic function without generating a warning in PHP? We can no longer use the '&' operator in a function call, otherwise I'd accept that (even though it would be error prone, should a coder forget it). What inspired this… >>> More
Variadic functions and arguments assignment in C/C++

as seen on Stack Overflow - Search for 'Stack Overflow'
I was wondering if in C/C++ language it is possible to pass arguments to function in key-value form. For example in python you can do: def some_function(arg0 = "default_value", arg1): # (...) value1 = "passed_value" some_function(arg1 = value1) So the alternative code in C could look like… >>> More
Calling cdecl Functions That Have Different Number of Arguments

as seen on Stack Overflow - Search for 'Stack Overflow'
I have functions that I wish to call based on some input. Each function has different number of arguments. In other words, if (strcmp(str, "funcA") == 0) funcA(a, b, c); else if (strcmp(str, "funcB") == 0) funcB(d); else if (strcmp(str, "funcC") == 0) funcC(f, g); This is a bit bulky and hard to… >>> More