1 files changed, 53 insertions, 0 deletions
diff --git a/vendor/derive_builder/examples/custom_defaults.rs b/vendor/derive_builder/examples/custom_defaults.rs
new file mode 100644
index 000000000..bf493d9e5
--- /dev/null
+++ b/vendor/derive_builder/examples/custom_defaults.rs
@@ -0,0 +1,53 @@
+#[macro_use]
+extern crate derive_builder;
+
+#[derive(Builder, PartialEq, Debug)]
+struct Lorem {
+    ipsum: String,
+    #[builder(default = "self.default_dolor()?")]
+    dolor: String,
+    #[builder(default = "self.default_sit()?")]
+    sit: String,
+    #[builder(setter(skip), default = "self.default_amet()")]
+    amet: String,
+}
+
+impl LoremBuilder {
+    fn default_dolor(&self) -> Result<String, String> {
+        self.ipsum
+            .clone()
+            .ok_or_else(|| "ipsum must be initialized to build dolor".to_string())
+    }
+
+    fn default_sit(&self) -> Result<String, String> {
+        match self.ipsum {
+            Some(ref x) if x.chars().count() > 3 => Ok(format!("sit {}", x)),
+            _ => Err("ipsum must at least 3 chars to build sit".to_string()),
+        }
+    }
+
+    fn default_amet(&self) -> String {
+        if let Some(ref x) = self.ipsum {
+            format!("amet {}", x)
+        } else {
+            "..nothing there".to_string()
+        }
+    }
+}
+
+fn main() {
+    let x = LoremBuilder::default()
+        .ipsum("ipsum".to_string())
+        .build()
+        .unwrap();
+
+    assert_eq!(
+        x,
+        Lorem {
+            ipsum: "ipsum".to_string(),
+            dolor: "ipsum".to_string(),
+            sit: "sit ipsum".to_string(),
+            amet: "amet ipsum".to_string(),
+        }
+    );
+}