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You don't even need to define a constructor

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

To commentors below: why wouldn't I be able to use a brace-or-equal-initializer here? Isn't this the same as below, a struct definition followed by an instantiation of an object?

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

foo bar;

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.

You don't even need to define a consructor

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

To commentors below: why wouldn't I be able to use a brace-or-equal-initializer here? Isn't this the same as below, a struct definition followed by a an instantiation of an object?

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

foo bar;

You don't even need to define a constructor

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

To commentors below: why wouldn't I be able to use a brace-or-equal-initializer here? Isn't this the same as below, a struct definition followed by an instantiation of an object?

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

foo bar;