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rust source #1
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mrustc (master)
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pub fn try_from_secs_f64(secs: f64) -> Result<Duration, FromSecsError> { const MAX_NANOS_F64: f64 = ((u64::MAX as u128 + 1) * (NANOS_PER_SEC as u128)) as f64; const NANOS_PER_SEC: u32 = 1_000_000_000; let nanos = secs * (NANOS_PER_SEC as f64); if !nanos.is_finite() { Err(FromSecsError { kind: FromSecsErrorKind::NonFinite }) } else if nanos >= MAX_NANOS_F64 { Err(FromSecsError { kind: FromSecsErrorKind::Overflow }) } else if nanos < 0.0 { Err(FromSecsError { kind: FromSecsErrorKind::Negative }) } else { let nanos = nanos as u128; Ok(Duration { secs: (nanos / (NANOS_PER_SEC as u128)) as u64, nanos: (nanos % (NANOS_PER_SEC as u128)) as u32, }) } } pub struct Duration { secs: u64, nanos: u32, // Always 0 <= nanos < NANOS_PER_SEC } pub struct FromSecsError { kind: FromSecsErrorKind, } enum FromSecsErrorKind { // Value is not a finite value (either infinity or NaN). NonFinite, // Value is too large to store in a `Duration`. Overflow, // Value is less than `0.0`. Negative, }
rust source #2
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mrustc (master)
rustc 1.0.0
rustc 1.1.0
rustc 1.10.0
rustc 1.11.0
rustc 1.12.0
rustc 1.13.0
rustc 1.14.0
rustc 1.15.1
rustc 1.16.0
rustc 1.17.0
rustc 1.18.0
rustc 1.19.0
rustc 1.2.0
rustc 1.20.0
rustc 1.21.0
rustc 1.22.0
rustc 1.23.0
rustc 1.24.0
rustc 1.25.0
rustc 1.26.0
rustc 1.27.0
rustc 1.27.1
rustc 1.28.0
rustc 1.29.0
rustc 1.3.0
rustc 1.30.0
rustc 1.31.0
rustc 1.32.0
rustc 1.33.0
rustc 1.34.0
rustc 1.35.0
rustc 1.36.0
rustc 1.37.0
rustc 1.38.0
rustc 1.39.0
rustc 1.4.0
rustc 1.40.0
rustc 1.41.0
rustc 1.42.0
rustc 1.43.0
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rustc 1.45.0
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rustc 1.48.0
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rustc 1.51.0
rustc 1.52.0
rustc 1.53.0
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rustc 1.56.0
rustc 1.57.0
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rustc 1.8.0
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rustc beta
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rustc-cg-gcc (master)
x86-64 GCCRS (GCC master)
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Source code
pub fn try_from_secs_f64(secs: f64) -> Result<Duration, FromSecsError> { const NANOS_PER_SEC: u32 = 1_000_000_000; const FRACT_BITS: u64 = 52; const FRACT_MASK: u64 = (1 << FRACT_BITS) - 1; const EXP_BITS: u64 = 11; const EXP_MASK: u64 = (1 << EXP_BITS) - 1; const DIV: u128 = 1u128 << FRACT_BITS; if secs.is_sign_negative() { return Err(FromSecsError { kind: FromSecsErrorKind::Negative }); } else if !secs.is_finite() { return Err(FromSecsError { kind: FromSecsErrorKind::NonFinite }); } let bits = secs.to_bits(); let fract = (bits & FRACT_MASK) | (FRACT_MASK + 1); let exp = ((bits >> FRACT_BITS) & EXP_MASK) as i32 - 1023; let (secs, nanos) = match exp { -1023..=-33 => (0, 0), -32..=-1 => { let t = fract >> exp.abs(); let nanos = (NANOS_PER_SEC as u128 * (t as u128)) / DIV; (0, nanos as u32) } 0..=51 => { let secs = fract >> (FRACT_BITS - exp as u64); let t = (fract << exp) & FRACT_MASK; let nanos = (NANOS_PER_SEC as u128 * (t as u128)) / DIV; (secs, nanos as u32) } 52..=63 => { let secs = fract << (exp as u64 - FRACT_BITS); (secs, 0) } _ => return Err(FromSecsError { kind: FromSecsErrorKind::Overflow }), }; Ok(Duration { secs, nanos }) } pub struct Duration { secs: u64, nanos: u32, // Always 0 <= nanos < NANOS_PER_SEC } pub struct FromSecsError { kind: FromSecsErrorKind, } enum FromSecsErrorKind { // Value is not a finite value (either infinity or NaN). NonFinite, // Value is too large to store in a `Duration`. Overflow, // Value is less than `0.0`. Negative, }
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