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Move sqrt from std to core #63455

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Move sqrt from std to core #63455

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35705fe
move f32::sqrt
Lokathor Aug 11, 2019
c069773
update example usage
Lokathor Aug 11, 2019
fe2812a
move f64::sqrt to core
Lokathor Aug 11, 2019
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27 changes: 27 additions & 0 deletions src/libcore/num/f32.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -576,4 +576,31 @@ impl f32 {
pub fn from_ne_bytes(bytes: [u8; 4]) -> Self {
Self::from_bits(u32::from_ne_bytes(bytes))
}

/// Takes the square root of a number.
///
/// Returns NaN if `self` is a negative number.
///
/// # Examples
///
/// ```
/// use core::f32;
///
/// let positive = 4.0_f32;
/// let negative = -4.0_f32;
///
/// let abs_difference = (positive.sqrt() - 2.0).abs();
///
/// assert!(abs_difference <= f32::EPSILON);
/// assert!(negative.sqrt().is_nan());
/// ```
#[stable(feature = "rust1", since = "1.0.0")]
#[inline]
pub fn sqrt(self) -> f32 {
if self < 0.0 {
NAN
} else {
unsafe { intrinsics::sqrtf32(self) }
}
}
}
25 changes: 25 additions & 0 deletions src/libcore/num/f64.rs
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Expand Up @@ -589,4 +589,29 @@ impl f64 {
pub fn from_ne_bytes(bytes: [u8; 8]) -> Self {
Self::from_bits(u64::from_ne_bytes(bytes))
}

/// Takes the square root of a number.
///
/// Returns NaN if `self` is a negative number.
///
/// # Examples
///
/// ```
/// let positive = 4.0_f64;
/// let negative = -4.0_f64;
///
/// let abs_difference = (positive.sqrt() - 2.0).abs();
///
/// assert!(abs_difference < 1e-10);
/// assert!(negative.sqrt().is_nan());
/// ```
#[stable(feature = "rust1", since = "1.0.0")]
#[inline]
pub fn sqrt(self) -> f64 {
if self < 0.0 {
NAN
} else {
unsafe { intrinsics::sqrtf64(self) }
}
}
}
27 changes: 0 additions & 27 deletions src/libstd/f32.rs
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Expand Up @@ -350,33 +350,6 @@ impl f32 {
return unsafe { intrinsics::powf32(self, n) };
}

/// Takes the square root of a number.
///
/// Returns NaN if `self` is a negative number.
///
/// # Examples
///
/// ```
/// use std::f32;
///
/// let positive = 4.0_f32;
/// let negative = -4.0_f32;
///
/// let abs_difference = (positive.sqrt() - 2.0).abs();
///
/// assert!(abs_difference <= f32::EPSILON);
/// assert!(negative.sqrt().is_nan());
/// ```
#[stable(feature = "rust1", since = "1.0.0")]
#[inline]
pub fn sqrt(self) -> f32 {
if self < 0.0 {
NAN
} else {
unsafe { intrinsics::sqrtf32(self) }
}
}

/// Returns `e^(self)`, (the exponential function).
///
/// # Examples
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25 changes: 0 additions & 25 deletions src/libstd/f64.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -317,31 +317,6 @@ impl f64 {
unsafe { intrinsics::powf64(self, n) }
}

/// Takes the square root of a number.
///
/// Returns NaN if `self` is a negative number.
///
/// # Examples
///
/// ```
/// let positive = 4.0_f64;
/// let negative = -4.0_f64;
///
/// let abs_difference = (positive.sqrt() - 2.0).abs();
///
/// assert!(abs_difference < 1e-10);
/// assert!(negative.sqrt().is_nan());
/// ```
#[stable(feature = "rust1", since = "1.0.0")]
#[inline]
pub fn sqrt(self) -> f64 {
if self < 0.0 {
NAN
} else {
unsafe { intrinsics::sqrtf64(self) }
}
}

/// Returns `e^(self)`, (the exponential function).
///
/// # Examples
Expand Down