1 files changed, 44 insertions, 0 deletions
diff --git a/src/nanosecond.hpp b/src/nanosecond.hpp
new file mode 100644
index 00000000..94c30ba3
--- /dev/null
+++ b/src/nanosecond.hpp
@@ -0,0 +1,44 @@
+#pragma once
+#include <compare>
+
+namespace floormat {
+
+struct Ns
+{
+    explicit constexpr Ns(): stamp{0} {}
+
+    template<typename T> requires (std::is_integral_v<T> && std::is_unsigned_v<T>) explicit constexpr Ns(T x) : stamp{x} {}
+    template<typename T> requires (std::is_integral_v<T> && !std::is_unsigned_v<T>) explicit constexpr Ns(T x) : stamp{uint64_t(x)} { fm_assert(x >= T{0}); }
+
+    explicit constexpr operator uint64_t() const { return stamp; }
+    explicit constexpr operator double() const = delete;
+    explicit constexpr operator float() const = delete;
+    friend Ns operator*(const Ns&, const Ns&) = delete;
+
+    friend constexpr Ns operator+(const Ns& lhs, const Ns& rhs);
+    friend constexpr Ns operator-(const Ns& lhs, const Ns& rhs);
+    template<typename T> requires (std::is_same_v<T, double>) friend Ns operator*(const Ns& lhs, T b);
+    template<typename T> requires (std::is_integral_v<T> && std::is_unsigned_v<T>) friend constexpr Ns operator*(const Ns& lhs, T rhs);
+    template<typename T> requires (std::is_integral_v<T> && std::is_signed_v<T> && sizeof(T) < sizeof(uint64_t)) friend constexpr Ns operator*(const Ns&, T);
+    template<typename T> friend constexpr Ns operator*(T lhs, const Ns& rhs);
+    template<typename T> requires std::is_same_v<float, T> friend constexpr Ns operator*(const Ns& lhs, T rhs);
+
+    friend constexpr uint64_t operator/(const Ns& lhs, const Ns& rhs);
+    friend constexpr Ns operator/(const Ns& lhs, uint64_t b);
+    friend constexpr uint64_t operator%(const Ns& lhs, const Ns& rhs);
+
+    friend constexpr Ns operator%(const Ns& lhs, uint64_t b);
+    friend constexpr Ns& operator+=(Ns& lhs, const Ns& rhs);
+
+    friend constexpr bool operator==(const Ns& lhs, const Ns& rhs) = default;
+    friend constexpr std::strong_ordering operator<=>(const Ns& lhs, const Ns& rhs);
+
+    friend Debug& operator<<(Debug& dbg, const Ns& box);
+
+    uint64_t stamp;
+};
+
+constexpr inline Ns Minute{60000000000}, Second{1000000000}, Millisecond{1000000}, Microsecond{1000};
+constexpr inline const Ns& Minutes{Minute}, Seconds{Second}, Milliseconds{Millisecond}, Microseconds{Microsecond};
+
+} // namespace floormat