Question

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What are the differences between struct and class in C++

I am looking at somebody header file for a structure, but it looks like functions are a part of this structure… so then this is a class but how to abstantiate? or use?

struct Recording
{
    FLAG mode;  
    unsigned short intervals;   
      unsigned short saved_cycles;                                      
    virtual void SavetoFile( FILE *file, 
        bool Control, 
        PhaseData *__phaseData = NULL   
        );

    virtual bool LoadfromFile( FILE *file, 
        bool Control, 
        PhaseData *__phaseData = NULL 
        );
};

Answer 1

In C++ class and structare identical, except that the default access specifier for the former is private, while for the latter it is public.

class Base { /* .. */ };

class Foo : Base
{
  int i;
};

struct Bar : Base
{
  int i;
};

In the above code, Foo inherits privately from Base while Bar does so publicly. Similarly, Foo::i is private while Bar::i is public. Note that the visibility of i in both cases has nothing to do with inheritance i.e. it’d be the same even if Foo and Bar did not inherit from Base.

Other than these differences, everything that you can do with one, you can also do with the other.