CODEWITHSUNDEEP
c++function-pointersfunction-reference
JWCS
JWCS

Reputation: 1211

C++Niche Syntax: Function Reference Type Declaration: const reference?

This is a niche question, but I'm struggling to find a sufficient answer.

Struct members can be const, but can a function pointer/reference member be declared const? Based off my reading of C++17 section 9.3, I don't think so:

struct Ex {
  const int i;
  void (*pfn)(int i); // 1. can pfn be a const member?
  void (&rfn)(int i); // 2. can rfn be a const member?
};

Upvotes: 3

Views: 88

Answers (1)

Ted Lyngmo
Ted Lyngmo

Reputation: 117812

  1. Yes: 
    struct Ex {
    const int i;
    void (*const pfn)(int i); // 1. can pfn be a const member?
    void (&rfn)(int i);       // 2. can rfn be a const member?
};
  2. It already is - You can't assign to a member referencing a function.

Upvotes: 5

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