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c_double
source link: https://doc.rust-lang.org/stable/std/ffi/type.c_double.html
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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, and it may be f32 or something entirely different from the IEEE-754 standard.
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