code: def test_using():
      v = Type("std::vector")
      u1 = using(v)
      assert cxxcode(u1) == "using std::vector"
  
      u2 = using(v, "vec")
      assert cxxcode(u2) == "using vec = std::vector"
  
imports: from sympy.core.symbol import Symbol
  from sympy.codegen.ast import Type
  from sympy.codegen.cxxnodes import using
  from sympy.printing.codeprinter import cxxcode
label_desc: Use image node_id 1 for calling a global function with example usage: test_using() without return types