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#pragma once
#include "compat/assert.hpp"
#include <compare>
namespace floormat {
// todo! move to .inl
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}); }
#if 0
template<typename T>
requires std::is_same_v<T, float>
explicit constexpr Ns(T x) : stamp{}
{
constexpr float max{uint64_t{1} << 24};
fm_assert(x >= 0);
fm_assert(x <= max);
stamp = uint64_t(x);
}
template<typename T>
requires std::is_same_v<T, double>
explicit constexpr Ns(T x) : stamp{}
{
constexpr double max{uint64_t{1} << 53};
fm_assert(x >= 0);
fm_assert(x <= max);
stamp = uint64_t(x);
}
#endif
explicit constexpr operator uint64_t() const { return stamp; }
explicit constexpr operator double() const = delete;
explicit constexpr operator float() const = delete;
template<typename T>
requires (std::is_same_v<T, double>)
friend Ns operator*(const Ns& lhs, T b)
{
constexpr double max{uint64_t{1} << 53};
auto a = lhs.stamp;
fm_assert(b >= 0);
fm_assert(b <= max);
auto x = double(a) * b;
fm_assert(x <= max);
fm_assert(x >= 0);
return Ns{(uint64_t)x};
}
friend constexpr Ns operator+(const Ns& lhs, const Ns& rhs)
{
constexpr auto max = (uint64_t)-1;
auto a = lhs.stamp, b = rhs.stamp;
fm_assert(max - a >= b);
return Ns{a + b};
}
friend constexpr Ns operator-(const Ns& lhs, const Ns& rhs)
{
auto a = lhs.stamp, b = rhs.stamp;
fm_assert(a >= b);
return Ns{a - b};
}
friend Ns operator*(const Ns&, const Ns&) = delete;
template<typename T>
requires (std::is_integral_v<T> && std::is_unsigned_v<T>)
friend constexpr Ns operator*(const Ns& lhs, T rhs)
{
auto a = lhs.stamp, b = uint64_t{rhs};
auto x = a * b;
fm_assert(b == 0 || x / b == a);
return Ns{x};
}
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& lhs, T rhs)
{
fm_assert(rhs >= T{0});
auto b = uint64_t(rhs);
auto x = lhs.stamp * b;
fm_assert(b == 0 || x / b == lhs.stamp);
return Ns{x};
}
template<typename T>
friend constexpr Ns operator*(T lhs, const Ns& rhs) { return rhs * lhs; }
template<typename T>
requires std::is_same_v<float, T>
friend constexpr Ns operator*(const Ns& lhs, T rhs)
{
constexpr float max{uint64_t{1} << 24};
auto a = lhs.stamp;
auto x = float(a) * float{rhs};
fm_assert(x >= 0);
fm_assert(x <= max);
return Ns{uint64_t(x)};
}
#if 0
template<typename T> requires (!std::is_same_v<Ns, T>)
friend constexpr Ns operator*(const T& lhs, const Ns& rhs) { return rhs * lhs; }
#endif
friend constexpr uint64_t operator/(const Ns& lhs, const Ns& rhs)
{
auto a = lhs.stamp, b = rhs.stamp;
fm_assert(b != 0);
return a / b;
}
friend constexpr Ns operator/(const Ns& lhs, uint64_t b)
{
auto a = lhs.stamp;
fm_assert(b != 0);
return Ns{a / b};
}
#if 0
template<typename T>
requires std::is_floating_point_v<T>
friend constexpr double operator/(const Ns& lhs, double b)
{
fm_assert(b != 0.);
auto x = double{lhs.stamp / b};
constexpr auto max = double{uint64_t{1} << 53};
fm_assert(x <= max);
return x;
}
#endif
friend constexpr uint64_t operator%(const Ns& lhs, const Ns& rhs)
{
auto a = lhs.stamp, b = rhs.stamp;
fm_assert(b != 0);
return a % b;
}
friend constexpr Ns operator%(const Ns& lhs, uint64_t b)
{
auto a = lhs.stamp;
fm_assert(b != 0);
return Ns{a % b};
}
friend constexpr Ns& operator+=(Ns& lhs, const Ns& rhs)
{
constexpr auto max = (uint64_t)-1;
auto b = rhs.stamp;
fm_assert(max - lhs.stamp >= b);
lhs.stamp += b;
return lhs;
}
friend constexpr bool operator==(const Ns& lhs, const Ns& rhs) = default;
friend constexpr std::strong_ordering operator<=>(const Ns& lhs, const Ns& rhs)
{
auto a = lhs.stamp, b = rhs.stamp;
return a <=> b;
}
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};
struct Time final
{
static Time now() noexcept;
bool operator==(const Time&) const noexcept;
std::strong_ordering operator<=>(const Time&) const noexcept;
friend Ns operator-(const Time& lhs, const Time& rhs) noexcept;
[[nodiscard]] Ns update(const Time& ts = now()) & noexcept;
static float to_seconds(const Ns& ts) noexcept;
static float to_milliseconds(const Ns& ts) noexcept;
uint64_t stamp = init();
private:
static uint64_t init() noexcept;
};
constexpr inline size_t fm_DATETIME_BUF_SIZE = 32;
const char* format_datetime_to_string(char(&buf)[fm_DATETIME_BUF_SIZE]);
} // namespace floormat
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