c++ - Incomplete Type of Nested Class -


i have code in following form:

class trie{ public:     trie( ) : root( new trienode( ) ){ };      // inserts word trie.     void insert( std::string word );      // returns if word in trie.     bool search( std::string word );      // returns if there word in trie     // starts given prefix.     bool startswith( std::string prefix );  private:     class trienode;     std::unique_ptr<trienode> root; };  class trie::trienode{ public:     trienode( ) : eow( false ){ };      trienode* appendchar( char tar );      void end( );      bool isend( );      trienode* getchar( char tar );      int getind( char tar );  private:     std::array<std::unique_ptr<trienode>, 26> data;     bool eow;                        // end of word };

however, @ third line, trie(): root( new trienode() ), compiler continue complains trienode incomplete. how can fix it?

thanks!

define trie's constructor after trienode definition

class trie::trienode{...}  // must aftter class trie defined trie::trie( ) : root( new trienode( ) ){ };

otherwise constructor of trie needs full definition of trienode, needs construct new object, hence error.


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