hash_code.hpp

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#pragma once
#include "collections/generic/helpers/hasher.hpp"
#include "object.hpp"

namespace xtd {
  class hash_code : public xtd::object {
  public:
    
    hash_code() = default;
    
    
    template<typename type_t>
    hash_code& add(const type_t& value) noexcept {
      hash_code_ = hash_combine(hash_code_, xtd::collections::generic::helpers::hasher<type_t> {}(value));
      return *this;
    }
    
    bool equals(const xtd::object& other) const noexcept override;
    
    xtd::usize get_hash_code() const noexcept override;
    
    xtd::usize to_hash_code() const noexcept;
    
    
    template<typename ...args_t>
    static xtd::usize combine(args_t... values) noexcept {return combine_iterator(generate_uniqueness_seed(), values...);}
    
  private:
    template<typename type_t, typename ...args_t>
    static xtd::usize combine_iterator(xtd::usize seed, const type_t& value, args_t... values) noexcept {return combine_iterator(hash_combine(seed, xtd::collections::generic::helpers::hasher<type_t> {}(value)), values...);}
    static xtd::usize combine_iterator(xtd::usize seed) noexcept;
    static xtd::usize hash_combine(xtd::usize seed, xtd::usize value) noexcept;
    static xtd::usize generate_uniqueness_seed() noexcept;
    
    xtd::usize hash_code_ = generate_uniqueness_seed();
  };
}