1 #include <ceed.h> 2 #include <sstream> 3 4 class Tab { 5 private: 6 CeedInt _num_tabs{0}; 7 const CeedInt _width{2}; 8 9 template <class OStream> 10 friend OStream &operator<<(OStream &os, const Tab &tab); 11 12 public: push()13 Tab &push() { 14 _num_tabs++; 15 return *this; 16 } pop()17 Tab &pop() { 18 if (_num_tabs > 0) _num_tabs--; 19 return *this; 20 } 21 }; 22 23 template <class OStream> 24 OStream &operator<<(OStream &os, const Tab &tab) { 25 os << std::string(tab._num_tabs * tab._width, ' '); 26 return os; 27 } 28