SHAMapHash.h

#pragma once
 
#include <xrpl/basics/base_uint.h>
#include <xrpl/basics/partitioned_unordered_map.h>
 
#include <cstddef>
#include <ostream>
#include <string>
 
namespace xrpl {
 
// A SHAMapHash is the hash of a node in a SHAMap, and also the
// type of the hash of the entire SHAMap.
 
class SHAMapHash
{
    uint256 hash_;
 
public:
    SHAMapHash() = default;
    explicit SHAMapHash(uint256 const& hash) : hash_(hash)
    {
    }
 
    [[nodiscard]] uint256 const&
    asUInt256() const
    {
        return hash_;
    }
    uint256&
    asUInt256()
    {
        return hash_;
    }
    [[nodiscard]] bool
    isZero() const
    {
        return hash_.isZero();
    }
    [[nodiscard]] bool
    isNonZero() const
    {
        return hash_.isNonZero();
    }
    [[nodiscard]] int
    signum() const
    {
        return hash_.signum();
    }
    void
    zero()
    {
        hash_.zero();
    }
 
    friend bool
    operator==(SHAMapHash const& x, SHAMapHash const& y)
    {
        return x.hash_ == y.hash_;
    }
 
    friend bool
    operator<(SHAMapHash const& x, SHAMapHash const& y)
    {
        return x.hash_ < y.hash_;
    }
 
    friend std::ostream&
    operator<<(std::ostream& os, SHAMapHash const& x)
    {
        return os << x.hash_;
    }
 
    friend std::string
    to_string(SHAMapHash const& x)
    {
        return to_string(x.hash_);
    }
 
    template <class H>
    friend void
    hash_append(H& h, SHAMapHash const& x)
    {
        hash_append(h, x.hash_);
    }
};
 
template <>
inline std::size_t
extract(SHAMapHash const& key)
{
    return *reinterpret_cast<std::size_t const*>(key.asUInt256().data());
}
 
}  // namespace xrpl