Rust Macro for slightly simplifying flatbuffers

[AndrewOfC]

The building of messages in Rust tends to be a bit tedious. In part of wanting to up my Rust 'macro game' and make building messages a bit easier I came up with this macro:

        use paste::paste;
        
        #[macro_export]
        macro_rules! build_flatbuffer {
            ($builder:expr, $typ:ident, $($field:ident, $value:expr),* ) => {
                {
                paste::paste! {
                let args = [<$typ Args>] {
                    $($field: $value,)*
                } ;
                $typ::create($builder, &args)
                } }
            }
        }

Typically, you do something like this to build a piece of a message:

    // given this struct:
     pub struct AddRequest {
         pub a: u32,
         pub b: u32,
     }
    
    // Build a flatbuffer
    let args = AddRequestArgs {
         a: 1,
         b: 2,
     } ;
    
     let req = AddRequest::create(&mut builder, &args) ;

With this macro, you can do this instead:

    let req = build_flatbuffer!(&mut builder, AddRequest, a, 1, b, 2) ;