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  1. #include <string>
  2. #include <sstream>
  3. #include <iostream>
  4.  
  5. struct node
  6. {
  7.     node( const std::string& d, node* lc, node* rc )
  8.         : data(d), left_child(lc), right_child(rc) {}
  9.  
  10.     ~node() { delete left_child ; delete right_child ; }
  11.  
  12.     std::string data ;
  13.     node* left_child ; // unique owning pointer
  14.     node* right_child ; // unique owning pointer
  15.  
  16.     private: node( const node& ) ; void operator= ( const node& ) ; // non-copyable
  17. };
  18.  
  19. std::ostream& write( std::ostream& stm, node* tree )
  20. {
  21.     if(tree)
  22.     {
  23.         stm << tree->data << ' ' ;
  24.         write( stm, tree->left_child ) ;
  25.         return write( stm, tree->right_child ) ;
  26.     }
  27.     else return stm << "# " ;
  28. }
  29.  
  30. node* make_tree( std::istream& stm )
  31. {
  32.     std::string data ;
  33.     if( stm >> data && data != "#" )
  34.     {
  35.         /*auto*/ node* left_child = make_tree(stm) ;
  36.         return new node( data, left_child, make_tree(stm) ) ;
  37.     }
  38.     else return 0 ;
  39. }
  40.  
  41. int main()
  42. {
  43.     std::istringstream stm( "root aaa C # # D # # string 1231 # # #" ) ;
  44.     /*auto*/node* tree = make_tree(stm) ;
  45.     write( std::cout, tree ) << '\n' ;
  46.     delete tree ;
  47. }
  48.  
Success #stdin #stdout 0s 3476KB
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root aaa C # # D # # string 1231 # # #
https://ideone.com/nE2QTZ
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
public

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