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#[macro_export]
macro_rules! NewQuantity {
($quantity:ident, $units:ident, $tolerance:expr) => {
#[derive(Debug)]
pub struct $quantity<T: $units> {
base_unit: i64,
unit: PhantomData<T>,
}
macro_rules! ImplQuantityFromNumber {
($N:ty) => {
impl<T> From<$N> for $quantity<T>
where
T: $units,
{
fn from(n: $N) -> Self {
$quantity {
base_unit: (n as f64 * T::conv_factor_base_unit() as f64) as i64,
unit: PhantomData,
}
}
}
impl<T> From<$quantity<T>> for $N
where
T: $units,
{
fn from(t: $quantity<T>) -> $N {
(t.base_unit as f64 / (T::conv_factor_base_unit() as f64)) as $N
}
}
impl<T> From<&$quantity<T>> for $N
where
T: $units,
{
fn from(t: &$quantity<T>) -> $N {
(t.base_unit as f64 / (T::conv_factor_base_unit() as f64)) as $N
}
}
};
}
macro_rules! ImplOpsForNumber {
($N:ty) => {
impl<T> ops::Add<$N> for $quantity<T>
where
T: $units,
{
type Output = Self;
fn add(self, rhs: $N) -> Self::Output {
$quantity {
base_unit: self.base_unit
+ (rhs as f64 * T::conv_factor_base_unit() as f64) as i64,
unit: PhantomData,
}
}
}
impl<T> ops::Add<$quantity<T>> for $N
where
T: $units,
{
type Output = $quantity<T>;
fn add(self, rhs: $quantity<T>) -> Self::Output {
$quantity {
base_unit: rhs.base_unit
+ (self as f64 * T::conv_factor_base_unit() as f64) as i64,
unit: PhantomData,
}
}
}
impl<T> ops::Sub<$N> for $quantity<T>
where
T: $units,
{
type Output = Self;
fn sub(self, rhs: $N) -> Self::Output {
$quantity {
base_unit: self.base_unit
- (rhs as f64 * T::conv_factor_base_unit() as f64) as i64,
unit: PhantomData,
}
}
}
impl<T> ops::Mul<$N> for $quantity<T>
where
T: $units,
{
type Output = Self;
fn mul(self, rhs: $N) -> Self::Output {
$quantity {
base_unit: (rhs as f64 * self.base_unit as f64) as i64,
unit: PhantomData,
}
}
}
impl<T> ops::Mul<$quantity<T>> for $N
where
T: $units,
{
type Output = $quantity<T>;
fn mul(self, rhs: $quantity<T>) -> Self::Output {
$quantity {
base_unit: (self as f64 * rhs.base_unit as f64) as i64,
unit: PhantomData,
}
}
}
impl<T> ops::Div<$N> for $quantity<T>
where
T: $units,
{
type Output = Self;
fn div(self, rhs: $N) -> Self::Output {
$quantity {
base_unit: ((self.base_unit as f64) / rhs as f64) as i64,
unit: PhantomData,
}
}
}
impl<T> ops::Div<$quantity<T>> for $N
where
T: $units,
{
type Output = $N;
fn div(self, rhs: $quantity<T>) -> Self::Output {
((T::conv_factor_base_unit() as f64 * self as f64) / (rhs.base_unit as f64))
as $N
}
}
};
}
impl<'a, T1, T2> From<&'a $quantity<T1>> for $quantity<T2>
where
T1: $units,
T2: $units,
{
fn from(t1: &'a $quantity<T1>) -> Self {
$quantity {
base_unit: (t1.base_unit),
unit: (PhantomData),
}
}
}
impl<T1, T2> ops::Div<$quantity<T2>> for $quantity<T1>
where
T1: $units,
T2: $units,
{
type Output = f64;
fn div(self, rhs: $quantity<T2>) -> Self::Output {
(self.base_unit as f64) / (rhs.base_unit as f64)
}
}
impl<T1, T2> ops::Sub<$quantity<T2>> for $quantity<T1>
where
T1: $units,
T2: $units,
{
type Output = $quantity<T1>;
fn sub(self, rhs: $quantity<T2>) -> Self::Output {
$quantity {
base_unit: (self.base_unit - rhs.base_unit),
unit: (PhantomData),
}
}
}
impl<T1, T2> PartialEq<$quantity<T1>> for $quantity<T2>
where
T1: $units,
T2: $units,
{
fn eq(&self, other: &$quantity<T1>) -> bool {
(self.base_unit - other.base_unit).abs() < $tolerance
}
}
ImplQuantityFromNumber!(i64);
ImplQuantityFromNumber!(f64);
ImplOpsForNumber!(f64);
ImplOpsForNumber!(i64);
};
}