Local type as template arguments in C++ [duplicate]

Answer 1

Which part of the standard says that this is wrong?

That would be §14.3.1/2 from the 2003 C++ Standard:

A local type, a type with no linkage, an unnamed type or a type compounded from any of these types shall not be used as a template-argument for a template type-parameter.

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How can make this code work?

Don't use a local type as a template argument.

Note that this restriction has been lifted in C++11, so using that language standard you are able to use a local type as a template argument.

Answer 2

14.3.1/2

A local type, a type with no linkage, an unnamed type or a type compounded from any of these types shall not be used as a template-argument for a template type-parameter.

Try compiling your code with -std=c++0x option (gcc 4.5.1). C++0x lifts the restriction and so you can use a local type as template argument.