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

Question

This question was already asked in the context of C#/.Net.

Now I\'d like to learn the differences between a struct and a class in C++. Please discuss the technical d

Answer 1

**UPDATE: ** Please ignore this reply. I did not consider the possibility that for the struct, the value was uninitialized but just happened to be 0. There is not an initialization difference between struct and class.

---

I am seeing another different between structs and classes having to do with default initialization.

struct Foo {
    int a;
};

class Bar {
    int a;
};

class Tester {
    Foo m_Foo = Foo();
    Bar m_Bar = Bar();

public:
    Tester() {}
};

int main() {
    auto myTester = Tester();
}

Run that code and examine myTester. You'll find that for m_Foo, the struct, m_Foo.a has been initialized to 0, but for m_Bar, the class, m_Bar.a is uninitialized. So there does appear to be a difference in what the default constructor does for struct vs. class. I'm seeing this with Visual Studio.