Question

GCC has a very verbose format for certain template error messages:

... some_class<A,B,C> [with int A = 1, int B = 2, int C = 3]

Any chance to make it show something like:

... some_class<1,2,3>

Answer 1

You will lose track from what template the specialization comes from:

template<int A, int B> class X {
  void f();
};

template<int A> class X<A, 2> {
  void f();
};

int main() {
  X<1, 2>().f();
  X<2, 1>().f();
}

GCC outputs

m.cpp: In function 'int main()':
m.cpp:6:12: error: 'void X<A, 2>::f() [with int A = 1]' is private
m.cpp:10:19: error: within this context
m.cpp:2:12: error: 'void X<A, B>::f() [with int A = 2, int B = 1]' is private
m.cpp:11:19: error: within this context

If it just said X<1, 2> and X<2, 1> you would lose an important information that this diagnostic contains.