Define a struct inside a class in C

Question

Can someone give me an example about how to define a new type of struct in a class in C     Thanks

User · Answer

Something like this   class Class          visibility will default to private unless you specify it     struct Struct             specify members here

User · Answer

Something like   class Tree     struct node      int data     node  llink     node  rlink

User · Answer

declare class  amp  nested struct probably in some header file  class C          struct will be private without  public   keyword     struct S              members will be public without  private   keyword         int sa          void func               void func S s        if you want to separate the implementation definition  maybe in some CPP file  void C  func S s           implementation here   void C  S  func         lt   note that you need the  full path  to the function        implementation here     if you want to inline the implementation  other answers will do fine

User · Answer

The other answers here have demonstrated how to define structs inside of classes  There   s another way to do this  and that   s to declare the struct inside the class  but define it outside  This can be useful  for example  if the struct is decently complex and likely to be used standalone in a way that would benefit from being described in detail somewhere else   The syntax for this is as follows   class Container                 struct Inner     Declare  but not define  the struct                struct Container  Inner         Define the struct here          You more commonly would see this in the context of defining nested classes rather than structs  a common example would be defining an iterator type for a collection class   but I thought for completeness it would be worth showing off here

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Yes you can  In c    class and struct are kind of similar  We can define not only structure inside a class  but also a class inside one  It is called inner class   As an example I am adding a simple Trie class   class Trie   private      struct node          node  alp 26           bool isend             node  root      node  createNode            node  newnode new node            for int i 0  i lt 26  i                 newnode- gt alp i  nullptr                    newnode- gt isend false          return newnode        public          Initialize your data structure here         Trie             root createNode                   Inserts a word into the trie         void insert string word            node  head root          for int i 0  i lt word length    i                 if head- gt alp int word i - a     nullptr                   node  newnode createNode                    head- gt alp int word i - a    newnode                            head head- gt alp int word i - a                       head- gt isend true                 Returns if the word is in the trie         bool search string word            node  head root          for int i 0  i lt word length    i                 if head- gt alp int word i - a     nullptr                   return false                            head head- gt alp int word i - a                       if head- gt isend  return true           return false                 Returns if there is any word in the trie that starts with the given prefix         bool startsWith string prefix            node  head root          for int i 0  i lt prefix length    i                 if head- gt alp int prefix i - a     nullptr                   return false                            head head- gt alp int prefix i - a                       return true                   Your Trie object will be instantiated and called as such     Trie  obj   new Trie       obj- gt insert word      bool param 2   obj- gt search word      bool param 3   obj- gt startsWith prefix

User · Answer

include lt iostream gt  using namespace std   class A       public          struct Assign                       public                  int a 10                  float b 20 5              private                  double c 30 0                  long int d 40                       struct Assign ALT      class B  public A   public      int x   10  private      float y   20 8      int main        B myobj     A obj       cout lt  lt myobj a lt  lt endl       cout lt  lt myobj b lt  lt endl       cout lt  lt obj a lt  lt endl       cout lt  lt obj b lt  lt endl     cout lt  lt myobj ALT a lt  lt endl       return 0         enter code here

[c++] Define a struct inside a class in C++

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