[ns] how to include vector into ns

[Daniel Dekst]

Hi,
   
  I'm trying to use 
  vector<string> stl
  in ns.
   
  I add
  #include <string>
  #include <vector>
  in the file.
   
  but it claims:
  Error: vector is undeclared
   
  However, if I use a single file to try the program.
  $g++  test.cpp -g -o test
  It works well.
   
  So why ns cannot recognize it?
   
  Best,
  Pei

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