Type Definition serde::lib::core::ffi::c_double

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pub type c_double = f64;
🔬 This is a nightly-only experimental API. (core_ffi_c)
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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.