Remove lazy_static dependency (#268)

Author: prehner

Cargo.toml

@@ -43,7 +43,6 @@ conv = "0.3"
 num-traits = "0.2"
 serde = "1.0"
 serde_json = "1.0"
-lazy_static = { version = "1.4", optional = true }
 indexmap = "2.0"
 rayon = { version = "1.7", optional = true }
 itertools = "0.14"
@@ -76,7 +75,7 @@ association = []
 pcsaft = ["association"]
 epcsaft = ["association"]
 gc_pcsaft = ["association"]
-uvtheory = ["lazy_static"]
+uvtheory = []
 pets = []
 saftvrqmie = []
 saftvrmie = []

src/uvtheory/parameters.rs

@@ -1,6 +1,5 @@
 use feos_core::parameter::{Identifier, ParameterError};
 use feos_core::parameter::{Parameter, PureRecord};
-use lazy_static::lazy_static;
 use ndarray::concatenate;
 use ndarray::prelude::*;
 use ndarray::Array2;
@@ -9,6 +8,7 @@ use serde::{Deserialize, Serialize};
 use std::collections::HashMap;
 use std::fmt;
 use std::fmt::Write;
+use std::sync::LazyLock;
 
 #[derive(Debug, Clone, Serialize, Deserialize, Default)]
 pub struct NoRecord;
@@ -74,9 +74,9 @@ impl std::fmt::Display for UVTheoryBinaryRecord {
     }
 }
 
-lazy_static! {
 /// Constants for BH temperature dependent HS diameter.
-    static ref CD_BH: Array2<f64> = arr2(&[
+static CD_BH: LazyLock<Array2<f64>> = LazyLock::new(|| {
+    arr2(&[
         [0.0, 1.09360455168912E-02, 0.0],
         [-2.00897880971934E-01, -1.27074910870683E-02, 0.0],
         [
@@ -89,8 +89,8 @@ lazy_static! {
             5.05384813757953E-03,
             4.91003312452622E-02,
         ],
-    ]);
-}
+    ])
+});
 
 #[inline]
 pub fn mie_prefactor<D: DualNum<f64> + Copy>(rep: D, att: D) -> D {