52 lines
1.3 KiB
C++
52 lines
1.3 KiB
C++
/** @file generation.hpp
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*
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* @author Roland Conybeare, Dec 2025
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**/
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#pragma once
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#include <cstddef>
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#include <cstdint>
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namespace xo {
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namespace mm {
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/** hard maximum number of generations **/
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static constexpr uint32_t c_max_generation = 3;
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/** @class generation
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* @brief type-safe generation number
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**/
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struct Generation {
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using value_type = std::uint32_t;
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constexpr Generation() = default;
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explicit constexpr Generation(value_type x) : value_{x} {}
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static Generation nursery() { return Generation{0}; }
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static Generation sentinel() { return Generation(c_max_generation); }
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bool is_sentinel() const noexcept { return value_ == c_max_generation; }
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constexpr operator value_type() const { return value_; }
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Generation & operator++() { ++value_; return *this; }
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std::uint32_t value_ = 0;
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};
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inline bool operator==(Generation lhs, Generation rhs) {
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return lhs.value_ == rhs.value_;
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}
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inline bool operator<(Generation lhs, Generation rhs) {
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return lhs.value_ < rhs.value_;
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}
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inline bool operator>(Generation lhs, Generation rhs) {
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return lhs.value_ > rhs.value_;
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}
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}
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}
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/* end generation.hpp */
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