diff options
Diffstat (limited to 'absl/hash/hash.h')
| -rw-r--r-- | absl/hash/hash.h | 29 |
1 files changed, 17 insertions, 12 deletions
diff --git a/absl/hash/hash.h b/absl/hash/hash.h index 339b685ffd20..297dc9cb22ac 100644 --- a/absl/hash/hash.h +++ b/absl/hash/hash.h @@ -42,23 +42,28 @@ // // Example: // -// // Suppose we have a class `Circle` for which we want to add hashing +// // Suppose we have a class `Circle` for which we want to add hashing: // class Circle { -// public: -// ... -// private: -// std::pair<int, int> center_; -// int radius_; -// }; -// -// // To add hashing support to `Circle`, we simply need to add an ordinary -// // function `AbslHashValue()`, and return the combined hash state of the -// // existing hash state and the class state: +// public: +// ... +// private: +// std::pair<int, int> center_; +// int radius_; +// }; // +// // To add hashing support to `Circle`, we simply need to add a free +// // (non-member) function `AbslHashValue()`, and return the combined hash +// // state of the existing hash state and the class state. You can add such a +// // free function using a friend declaration within the body of the class: +// class Circle { +// public: +// ... // template <typename H> // friend H AbslHashValue(H h, const Circle& c) { // return H::combine(std::move(h), c.center_, c.radius_); // } +// ... +// }; // // For more information, see Adding Type Support to `absl::Hash` below. // @@ -239,7 +244,7 @@ using Hash = absl::hash_internal::Hash<T>; // } // private: // virtual void HashValue(absl::HashState state) const = 0; -// }; +// }; // // class Impl : Interface { // private: |