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Comment how the significand limits lossless int->float conversion

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Josh Stone 2015-10-28 16:05:51 -07:00
parent 00d8d7bc04
commit 1a19f9877a
1 changed files with 4 additions and 0 deletions
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src/libcore/num/mod.rs
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@ -1515,6 +1515,10 @@ impl_from! { u16, i32 }
impl_from! { u16, i64 }
impl_from! { u32, i64 }
// Note: integers can only be represented with full precision in a float if
// they fit in the significand, which is 24 bits in f32 and 53 bits in f64.
// Lossy float conversions are not implemented at this time.
// Signed -> Float
impl_from! { i8, f32 }
impl_from! { i8, f64 }