add test newtype_to_primitive

This commit is contained in:
Josh Stone 2018-06-20 13:49:57 -07:00
parent 21e3620999
commit 60924ecc70
1 changed files with 38 additions and 0 deletions

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@ -356,3 +356,41 @@ fn newtype_from_primitive() {
check!(i8 i16 i32 i64 isize); check!(i8 i16 i32 i64 isize);
check!(u8 u16 u32 u64 usize); check!(u8 u16 u32 u64 usize);
} }
#[test]
fn newtype_to_primitive() {
#[derive(PartialEq, Debug)]
struct New<T>(T);
// minimal impl
impl<T: ToPrimitive> ToPrimitive for New<T> {
fn to_i64(&self) -> Option<i64> {
self.0.to_i64()
}
fn to_u64(&self) -> Option<u64> {
self.0.to_u64()
}
}
macro_rules! assert_eq_to {
($( $to:ident )+) => {$(
assert_eq!(T::$to(&Bounded::min_value()),
New::<T>::$to(&New(Bounded::min_value())));
assert_eq!(T::$to(&Bounded::max_value()),
New::<T>::$to(&New(Bounded::max_value())));
)+}
}
fn check<T: PartialEq + Debug + Bounded + ToPrimitive>() {
assert_eq_to!(to_i8 to_i16 to_i32 to_i64 to_isize);
assert_eq_to!(to_u8 to_u16 to_u32 to_u64 to_usize);
assert_eq_to!(to_f32 to_f64);
}
macro_rules! check {
($( $ty:ty )+) => {$( check::<$ty>(); )+}
}
check!(i8 i16 i32 i64 isize);
check!(u8 u16 u32 u64 usize);
}