Type Alias c_double 

pub 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; some 16-bit systems use [f32], for example. Esoteric systems could use something entirely different from the IEEE-754 standard.