CODEWITHSUNDEEP
c++functionstruct
John
John

Reputation: 4706

Function for C++ struct

Usually we can define a variable for a C++ struct, as in

struct foo {
  int bar;
};

Can we also define functions for a struct? How would we use those functions?

Upvotes: 128

Views: 278880

Answers (2)

Luchian Grigore
Luchian Grigore

Reputation: 258578

Yes, a struct is identical to a class except for the default access level (member-wise and inheritance-wise). (and the extra meaning class carries when used with a template)

Every functionality supported by a class is consequently supported by a struct. You'd use methods the same as you'd use them for a class.

struct foo {
  int bar;
  foo() : bar(3) {}   //look, a constructor
  int getBar() 
  { 
    return bar; 
  }
};

foo f;
int y = f.getBar(); // y is 3

Upvotes: 212

David G
David G

Reputation: 96810

Structs can have functions just like classes. The only difference is that they are public by default:

struct A {
    void f() {}
};

Additionally, structs can also have constructors and destructors.

struct A {
    A() : x(5) {}
    ~A() {}

    private: int x;
};

Upvotes: 60

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