c_double in std::ffi - Rust
Description: Equivalent to C’s `double` type.

## c_double

# Type Alias c_double

1.64.0 · Source

    pub type c_double = f64;

Expand description

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.