I probably jumped to the conclusion that "template argument number" meant "number of template instantiations". Sorry for that mistake. I guess "template argument number" means the maximum arity of any template. IOW, if "template argument number" was 5, then any template taking over 5 arguments would cause the MSVC10/11 compiler to diagnose an error. IOW:
tuple<T1,T2,T3,T4,T5>
would be OK, but:
tuple<T1,T2,T3,T4,T5,T6>
would cause MSV10/11 to issue a compiler error. Is that right?
Yes, right.
Also, I also read somewhere that MSVC had not yet implemented variadic templates:
Variadic templates are implemented in the updated MSVC 11 toolchain ("Microsoft Visual C++ Compiler Nov 2012 CTP"). http://www.microsoft.com/en-us/download/details.aspx?id=35515