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Rollup merge of - clarcharr:log_const, r=dtolnay

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Add more logarithm constants

Right now, we have `ln(2)` and `ln(10)`, but only `log2(e)` and `log10(e)`. This also adds `log2(10)` and `log10(2)` for consistency.
This commit is contained in:
kennytm 2018-05-09 17:24:44 +08:00
commit 8e7f6dbdd7
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2 changed files with 16 additions and 0 deletions
src/libcore/num
f32.rsf64.rs

8
src/libcore/num/f32.rs

@ -128,10 +128,18 @@ pub mod consts {
#[stable(feature = "rust1", since = "1.0.0")]
pub const LOG2_E: f32 = 1.44269504088896340735992468100189214_f32;
/// log<sub>2</sub>(10)
#[unstable(feature = "extra_log_consts", issue = "50540")]
pub const LOG2_10: f32 = 3.32192809488736234787031942948939018_f32;
/// log<sub>10</sub>(e)
#[stable(feature = "rust1", since = "1.0.0")]
pub const LOG10_E: f32 = 0.434294481903251827651128918916605082_f32;
/// log<sub>10</sub>(2)
#[unstable(feature = "extra_log_consts", issue = "50540")]
pub const LOG10_2: f32 = 0.301029995663981195213738894724493027_f32;
/// ln(2)
#[stable(feature = "rust1", since = "1.0.0")]
pub const LN_2: f32 = 0.693147180559945309417232121458176568_f32;

8
src/libcore/num/f64.rs

@ -124,10 +124,18 @@ pub mod consts {
#[stable(feature = "rust1", since = "1.0.0")]
pub const E: f64 = 2.71828182845904523536028747135266250_f64;
/// log<sub>2</sub>(10)
#[unstable(feature = "extra_log_consts", issue = "50540")]
pub const LOG2_10: f64 = 3.32192809488736234787031942948939018_f64;
/// log<sub>2</sub>(e)
#[stable(feature = "rust1", since = "1.0.0")]
pub const LOG2_E: f64 = 1.44269504088896340735992468100189214_f64;
/// log<sub>10</sub>(2)
#[unstable(feature = "extra_log_consts", issue = "50540")]
pub const LOG10_2: f64 = 0.301029995663981195213738894724493027_f64;
/// log<sub>10</sub>(e)
#[stable(feature = "rust1", since = "1.0.0")]
pub const LOG10_E: f64 = 0.434294481903251827651128918916605082_f64;