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#pragma once
#include <cstdint>
#include <functional>
#include <limits>
template <typename T>
struct ID
{
public:
using IDType = uint32_t;
static constexpr IDType invalid_value = std::numeric_limits<IDType>::max();
ID(IDType id = invalid_value) : id(id) {}
operator IDType() const { return id; }
IDType operator+(ID<T> other) const { return id + other.id; }
IDType operator+(int offset) const { return id + offset; }
IDType operator+(size_t offset) const { return id + offset; }
IDType operator-(ID<T> other) const { return id - other.id; }
IDType operator-(int offset) const { return id - offset; }
IDType operator/(int div) const { return id/div; }
IDType operator+=(ID<T> other) { return id += other.id; }
IDType operator-=(ID<T> other) { return id -= other.id; }
IDType operator=(ID<T> other) { return id = other.id; }
IDType operator++() { return ++id; }
IDType operator--() { return --id; }
bool operator!=(ID<T> other) const { return id != other.id; }
bool valid() const { return id != invalid_value; }
void invalidate() { id = invalid_value; }
private:
IDType id;
};
namespace std
{
template <typename T>
struct hash<ID<T>>
{
using IDType = typename ID<T>::IDType;
std::size_t operator()(ID<T> const& id) const noexcept
{
return std::hash<IDType>()(id);
}
};
}
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