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digitalmars.D.learn - Default argument for template tuple function parameter

reply "Vladimir Panteleev" <vladimir thecybershadow.net> writes:
AddressInfo[] getAddressInfo(T...)(string node, string service = null, T  
options)

DMD complains: "default argument expected for options".

What's the syntax for an empty tuple?

-- 
Best regards,
  Vladimir                            mailto:vladimir thecybershadow.net
Sep 06 2011
next sibling parent Timon Gehr <timon.gehr gmx.ch> writes:
On 09/06/2011 01:01 PM, Vladimir Panteleev wrote:
 AddressInfo[] getAddressInfo(T...)(string node, string service = null, T
 options)

TypeTuple!() emptyTuple; AddressInfo[] getAddressInfo(T...)(string node, string service = null, T options=emptyTuple) {} Error: cannot implicitly convert expression (tuple()) of type () to () And this smells like a compiler bug. Workaround: AddressInfo[] getAddressInfo()(string node){return getAddressInfo(node,cast(string)null);} AddressInfo[] getAddressInfo(T...)(string node, string service, T options);
Sep 06 2011
prev sibling parent "Vladimir Panteleev" <vladimir thecybershadow.net> writes:
On Tue, 06 Sep 2011 14:37:55 +0300, Timon Gehr <timon.gehr gmx.ch> wrote:

 Workaround:

 AddressInfo[] getAddressInfo()(string node){return  
 getAddressInfo(node,cast(string)null);}
 AddressInfo[] getAddressInfo(T...)(string node, string service, T  
 options);

Thanks, I tried this at first as well, but was turned off by having to cast null to string. In the end I just made the string parameter part of the variadic tuple.
 And this smells like a compiler bug.

Posted http://d.puremagic.com/issues/show_bug.cgi?id=6613. -- Best regards, Vladimir mailto:vladimir thecybershadow.net
Sep 06 2011