Implement From<RangeInclusive> for Uniform

Fixes #556.

Author: vks

Cargo.toml

@@ -12,6 +12,7 @@ Random number generators and other randomness functionality.
 """
 keywords = ["random", "rng"]
 categories = ["algorithms", "no-std"]
+build = "build.rs"
 
 [badges]
 travis-ci = { repository = "rust-lang-nursery/rand" }
@@ -53,5 +54,8 @@ fuchsia-zircon = { version = "0.3.2", optional = true }
 stdweb = { version = "0.4", optional = true }
 wasm-bindgen = { version = "0.2.12", optional = true }
 
+[build-dependencies]
+rustc_version = "0.2"
+
 [package.metadata.docs.rs]
 all-features = true

README.md

@@ -117,7 +117,7 @@ optional features are available:
 - `alloc` can be used instead of `std` to provide `Vec` and `Box`.
 - `i128_support` enables support for generating `u128` and `i128` values.
 - `log` enables some logging via the `log` crate.
-- `nightly` enables all unstable features (`i128_support`).
+- `nightly` enables all unstable features (`i128_support`, `simd_support`).
 - `serde1` enables serialization for some types, via Serde version 1.
 - `stdweb` enables support for `OsRng` on `wasm32-unknown-unknown` via `stdweb`
   combined with `cargo-web`.

build.rs

@@ -0,0 +1,8 @@
+extern crate rustc_version;
+use rustc_version::{version, Version};
+
+fn main() {
+    if version().unwrap() >= Version::parse("1.27.0").unwrap() {
+        println!("cargo:rustc-cfg=rust_1_27");
+    }
+}

src/distributions/uniform.rs

@@ -276,6 +276,13 @@ impl<X: SampleUniform> From<::core::ops::Range<X>> for Uniform<X> {
     }
 }
 
+#[cfg(rust_1_27)]
+impl<X: SampleUniform> From<::core::ops::RangeInclusive<X>> for Uniform<X> {
+    fn from(r: ::core::ops::RangeInclusive<X>) -> Uniform<X> {
+        Uniform::new_inclusive(r.start(), r.end())
+    }
+}
+
 /// Helper trait similar to [`Borrow`] but implemented
 /// only for SampleUniform and references to SampleUniform in
 /// order to resolve ambiguity issues.
@@ -1060,4 +1067,16 @@ mod tests {
         assert_eq!(r.inner.low, 2.0);
         assert_eq!(r.inner.scale, 5.0);
     }
+
+    #[cfg(rust_1_27)]
+    #[test]
+    fn test_uniform_from_std_range_inclusive() {
+        let r = Uniform::from(2u32..=6);
+        assert_eq!(r.inner.low, 2);
+        assert_eq!(r.inner.range, 5);
+        let r = Uniform::from(2.0f64..=7.0);
+        assert_eq!(r.inner.low, 2.0);
+        assert!(r.inner.scale > 5.0);
+        assert!(r.inner.scale < 5.0 + 1e-14);
+    }
 }