CODEWITHSUNDEEP
c++
yoyoy
yoyoy

Reputation: 395

Defining class members with structured bindings

I would like to define class members a, b using structured bindings, in something like the following way:

struct AB {
  int a;
  int b;
};

class MyClass {
  public:
    MyClass(AB ab) : ab{ab} {}

  private:
    AB ab;
    const auto [a, b] = ab;
}

However, with gcc 9.2.0 this causes the compiler error:

error: expected unqualified-id before ‘[’ token
   12 |     const auto [a, b] = ab;

Is there some way I can rewrite this with structured bindings so that it compiles? Or must I give up using structured bindings and define each member separately:

  const int a = ab.a;
  const int b = ab.b;

Upvotes: 1

Views: 143

Answers (1)

eerorika
eerorika

Reputation: 238361

I would like to define class members ... using structured bindings

Is there some way I can rewrite this with structured bindings so that it compiles?

No. You cannot have structured bindings as members.

Or must I give up using structured bindings and define each member separately:

That would be well-formed.

Regardless of how you declare the members, it is unclear why you'd want to have copies of the members of member as direct members. I recommend reconsidering your design.

Upvotes: 5

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