Support for new error handling.

src/static_data/libraries/growth_rate_library.rs

@@ -1,3 +1,4 @@
+use anyhow::Result;
 use std::fmt;
 use std::fmt::{Debug, Formatter};
 
@@ -12,7 +13,7 @@ pub trait GrowthRateLibrary: Debug + ValueIdentifiable {
     /// Calculates the level for a given growth key name and a certain experience.
     fn calculate_level(&self, growth_rate: &StringKey, experience: u32) -> LevelInt;
     /// Calculates the experience for a given growth key name and a certain level.
-    fn calculate_experience(&self, growth_rate: &StringKey, level: LevelInt) -> u32;
+    fn calculate_experience(&self, growth_rate: &StringKey, level: LevelInt) -> Result<u32>;
     /// Adds a new growth rate with a name and value.
     fn add_growth_rate(&mut self, key: &StringKey, value: Box<dyn GrowthRate>);
 }
@@ -41,7 +42,7 @@ impl GrowthRateLibrary for GrowthRateLibraryImpl {
         self.growth_rates[growth_rate].calculate_level(experience)
     }
     /// Calculates the experience for a given growth key name and a certain level.
-    fn calculate_experience(&self, growth_rate: &StringKey, level: LevelInt) -> u32 {
+    fn calculate_experience(&self, growth_rate: &StringKey, level: LevelInt) -> Result<u32> {
         self.growth_rates[growth_rate].calculate_experience(level)
     }
 
@@ -89,7 +90,7 @@ pub mod tests {
         pub GrowthRateLibrary{}
         impl GrowthRateLibrary for GrowthRateLibrary {
             fn calculate_level(&self, growth_rate: &StringKey, experience: u32) -> LevelInt;
-            fn calculate_experience(&self, growth_rate: &StringKey, level: LevelInt) -> u32;
+            fn calculate_experience(&self, growth_rate: &StringKey, level: LevelInt) -> Result<u32>;
             fn add_growth_rate(&mut self, key: &StringKey, value: Box<dyn GrowthRate>);
         }
         impl ValueIdentifiable for GrowthRateLibrary {
@@ -109,7 +110,7 @@ pub mod tests {
     #[test]
     fn add_growth_rate_to_library_and_calculate_experience() {
         let lib = build();
-        assert_eq!(lib.calculate_experience(&"test_growthrate".into(), 1), 0);
-        assert_eq!(lib.calculate_experience(&"test_growthrate".into(), 3), 10);
+        assert_eq!(lib.calculate_experience(&"test_growthrate".into(), 1).unwrap(), 0);
+        assert_eq!(lib.calculate_experience(&"test_growthrate".into(), 3).unwrap(), 10);
     }
 }