Type Definition std::os::raw::c_double

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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