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use std::sync::Once; static ALREADY_INIT: Once = Once::new(); mod c_predicates { #[link(name = "predicates")] extern "C" { pub fn exactinit(); pub fn orient2d(pa: &[f64;2], pb: &[f64;2], pc: &[f64;2]) -> f64; pub fn orient3d(pa: &[f64;3], pb: &[f64;3], pc: &[f64;3], pd: &[f64;3]) -> f64; pub fn incircle(pa: &[f64;2], pb: &[f64;2], pc: &[f64;2], pd: &[f64;2]) -> f64; pub fn insphere(pa: &[f64;3], pb: &[f64;3], pc: &[f64;3], pd: &[f64;3], pe: &[f64;3]) -> f64; } } pub fn exactinit() { ALREADY_INIT.call_once(|| { unsafe { c_predicates::exactinit(); } }) } pub fn orient2d(pa: &[f64;2], pb: &[f64;2], pc: &[f64;2]) -> f64 { unsafe { c_predicates::orient2d(pa, pb, pc) } } pub fn orient3d(pa: &[f64;3], pb: &[f64;3], pc: &[f64;3], pd: &[f64;3]) -> f64 { unsafe { c_predicates::orient3d(pa, pb, pc, pd) } } pub fn incircle(pa: &[f64;2], pb: &[f64;2], pc: &[f64;2], pd: &[f64;2]) -> f64 { unsafe { c_predicates::incircle(pa, pb, pc, pd) } } pub fn insphere(pa: &[f64;3], pb: &[f64;3], pc: &[f64;3], pd: &[f64;3], pe: &[f64;3]) -> f64 { unsafe { c_predicates::insphere(pa, pb, pc, pd, pe) } }