utils.hpp

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#pragma once
 
#include <cstdint>
#include <string>
#include <tuple>
#include <vector>
 
namespace bb::utils {
 
std::vector<uint8_t> hex_to_bytes(const std::string& hex);
 
template <typename... Ts> size_t hash_as_tuple(const Ts&... ts)
{
    // See https://stackoverflow.com/questions/7110301/generic-hash-for-tuples-in-unordered-map-unordered-set.
    size_t seed = 0;
    ((seed ^= std::hash<Ts>()(ts) + 0x9e3779b9 + (seed << 6) + (seed >> 2)), ...);
    return seed;
}
 
} // namespace bb::utils
 
// Define std::hash for any type that has a hash() method.
template <typename T>
concept Hashable = requires(const T& t) {
    { t.hash() } -> std::same_as<std::size_t>;
};
 
template <Hashable T> struct std::hash<T> {
    std::size_t operator()(const T& t) const noexcept { return t.hash(); }
};