BEGIN {
  line = 1;			# The line counter.
  saw_template = 0;		# Set if we saw 'template' on the previous line.
  entity = "";			# The current 'level 0' entity.
}

# Anything in column 0 is a level 0 entity, except accessibility keywords,
# or when it looks like a comment, is an opening brace, a prototype declaration,
# or a variable definition.
/^[^#[:space:]]/ && !/^public:/ && !/^private:/ && !/^[/*{]/ && !/;$/ {
  entity = $0
}

# A closing brace in column 0 means we left the current entity again.
/^}/ {
  entity = ""
}

# Do this for every line of the file.
{
  # If the previous line was "template<typename T>", then this line
  # contains the entity name, even if it is indented.
  if (saw_template)
  {
    entity = $0;
    saw_template = 0;
  }
  printf("%20s:\t%s\n", entity, $0);
  ++line
}

# Detect template declarations.
/^[[:space:]]*template<.*>$/ {
  saw_template = 1
}