hash functions

group turbo_hash_function

Functions

template<int&... ExplicitArgumentBarrier, typename ...Types>
size_t hash_of(const Types&... values)

hash_of() is a helper that generates a hash from the values of its arguments.

It dispatches to turbo::Hash directly, as follows:

• hash_of(t) == turbo::Hash<T>{}(t)

• hash_of(a, b, c) == hash_of(std::make_tuple(a, b, c)) hash_of(a1, a2, …) == hash_of(b1, b2, …) is guaranteed when

• The argument lists have pairwise identical C++ types

• a1 == b1 && a2 == b2 && …

The requirement that the arguments match in both type and value is critical. It means that a == b does not necessarily imply hash_of(a) == hash_of(b) if a and b have different types. For example, hash_of(2) != hash_of(2.0). Example:

#include <turbo/hash/hash.h>
int main() {
  std::string s = "hello";
  std::string_view sv = s;
  std::cout << turbo::hash_of(s) << std::endl;
  std::cout << turbo::hash_of(sv) << std::endl;
}

Output: 10074652746429307112

Template Parameters:

• ExplicitArgumentBarrier – ExplicitArgumentBarrier

• Types – Types

Parameters:

values – values

Returns:

size_t