type c_double = f64;
Equivalent to C's double type.
This type will almost always be f64, which is guaranteed to be an IEEE-754 double-precision float in Rust. That said, the standard technically only guarantees that it be a floating-point number with at least the precision of a float, and it may be f32 or something entirely different from the IEEE-754 standard.
© 2010 The Rust Project Developers
Licensed under the Apache License, Version 2.0 or the MIT license, at your option.
https://doc.rust-lang.org/std/os/raw/type.c_double.html