[cfe-dev] Clang 3.0 variadic template pack expansion error

Nick Smith nickrmc83 at gmail.com
Mon Jan 9 13:36:25 PST 2012


I have been looking at some basic variadic template uses and so decided 
to give clang a go.

I downloaded the latest binaries from 
http://llvm.org/releases/download.html for Ubuntu 11.10 and have tried 
compiling the below code without success. The error returned is Error: 
too many template parameters in template redeclaration. I believe the 
syntax is correct. Can somebody confirm whether the error is a compiler 
bug or simply incorrect implementation.

#include <iostream>

template<typename ...ArgTypes>
class Tuple;

class Tuple<>

template<typename FirstType, typename ...RestTypes> // Too many template 
class Tuple : public Tuple<RestTypes...>
         FirstType Value;
         Tuple( FirstType ValueIn, RestTypes ...Others )
         :Tuple<RestTypes...>( Others ), Value( ValueIn )

         FirstType GetValue() const
             return Value;

int main( int argc, char **argv )
     Tuple<std::string> TestTuple( std::string( "Hello Tuple World!" ) );
     std::cout << TestTuple.GetValue() << std::endl;
     return 0;

clang -I /opt/clang/libcxx/include -I /media/Source/Generic -L 
/opt/clang/libcxx/lib hello_world.cpp -o hello_world -Wall -v -m64 
-std=c++0x -stdlib=libc++ -ferror-limit=1

clang version 3.0 (tags/RELEASE_30/final)
Target: x86_64-unknown-linux-gnu
Thread model: posix



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