whereis name

Use whereis to print a list of all occurrences of function or class instantiations for a function or class template.

For a class template:

(dbx) whereis Array
class template instance: a.out`Array<int>
class template instance: a.out`Array<double>
class template:	a.out`template_doc_2.cc`Array

For a function template:

(dbx) whereis square
function template instance: a.out`square(double, double*)
function template instance: a.out`square(int, int*)
function template: a.out`square