c++ - Initializing default values in a struct

Question

If I needed to initialize only a few select values of a C++ struct, would this be correct:

struct foo {
    foo() : a(true), b(true) {}
    bool a;
    bool b;
    bool c;
 } bar;

Am I correct to assume I would end up with one struct item called bar with elements bar.a = true, bar.b = true and an undefined bar.c?

Answer 1

You don't even need to define a constructor

struct foo {
    bool a = true;
    bool b = true;
    bool c;
 } bar;

To clarify: these are called brace-or-equal-initializers (because you may also use brace initialization instead of equal sign). This is not only for aggregates: you can use this in normal class definitions. This was added in C++11.