Merge pull request korken89#56 from oblique/const-new

Make `StateMachine::new` and `StateMachine::new_with_state` const functions

CHANGELOG.md

@@ -15,6 +15,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 - [breaking] Actions now take owned values
 - [breaking] `state()` now returns a `Result`
+- `StateMachine::new` and `StateMachine::new_with_state` are now const functions
 
 ## [v0.6.0] - 2022-11-02
 

macros/src/codegen.rs

@@ -410,15 +410,15 @@ pub fn generate_code(sm: &ParsedStateMachine) -> proc_macro2::TokenStream {
     let starting_state_name = starting_state.to_string();
     let new_sm_code = match sm.state_data.data_types.get(&starting_state_name) {
         Some(st) => quote! {
-            pub fn new(context: T, state_data: #st ) -> Self {
+            pub const fn new(context: T, state_data: #st ) -> Self {
                 StateMachine {
                     state: Some(States::#starting_state (state_data)),
                     context
                 }
             }
         },
         None => quote! {
-            pub fn new(context: T ) -> Self {
+            pub const fn new(context: T ) -> Self {
                 StateMachine {
                     state: Some(States::#starting_state),
                     context
@@ -521,7 +521,7 @@ pub fn generate_code(sm: &ParsedStateMachine) -> proc_macro2::TokenStream {
 
             /// Creates a new state machine with an initial state.
             #[inline(always)]
-            pub fn new_with_state(context: T, initial_state: States <#state_lifetimes_code>) -> Self {
+            pub const fn new_with_state(context: T, initial_state: States <#state_lifetimes_code>) -> Self {
                 StateMachine {
                     state: Some(initial_state),
                     context