create constructors for VmcThru

src/lib.rs

@@ -1664,13 +1664,13 @@ impl VmcExtConfig {
 }
 
 #[derive(Clone, Copy, Debug)]
-enum ThruType {
+pub enum ThruType {
     Float(f32),
     Int(i32),
 }
 
 #[derive(Debug)]
-struct VmcThru {
+pub struct VmcThru {
     addr: String,
     arg1: String,
     arg2: Option<ThruType>
@@ -1712,6 +1712,18 @@ impl VmcMessage for VmcThru {
     }
 }
 
+impl VmcThru {
+    pub fn new(addr: String, arg1: String, arg2: Option<ThruType>) ->MsgNewResult<Self> {
+        Ok(Self { addr, arg1, arg2})
+    }
+    pub fn new_vmc_message(addr: String, arg1: String, arg2: Option<ThruType>) ->TraitMsgNewResult {
+        match Self::new(addr, arg1, arg2) {
+            Ok(val) => Ok(Box::new(val)),
+            Err(val) => Err(val),
+        }
+    }
+}
+
 #[derive(Debug)]
 struct VmcExtSetPeriod {
     status: i32,