Many times, we have a sequence of templated declarations, with the
same template<template-parameter-list[opt]>. For example, a class
definition and the definition of member functions defined outside the
class body. It is tedious (both while reading and writing code) to
repeat the template<template-parameter-list[opt]> before each
declaration. Consider:

template-group:
 template<template-parameter-list[opt]> { declaration-seq[opt] }


This can be defined to have the same effect as the code produced by
preceding each declaration in the declaration-seq with the
template<template-parameter-list[opt]>. If any declaration in the
declaration in the declaration-seq cannot be templated (eg. int x;),
the result would be the same as if it was outside a template-group and
preceded by a template<template-parameter-list[opt]> -- a compile
error.

This is analogous to applying a linkage specification to a group of
declarations( eg. extern "C" {/*...*/}).

The only purpose of a template-group would be as a synctatic
convnience.

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