Module lua_convert 

FromLua / IntoLua — bidirectional conversion between Rust types and LuaValue.

These traits allow Lua function arguments and return values to be expressed with native Rust types instead of manually calling get_arg / push_value.

Built-in impls

• (), bool, i8..i64, u8..u64, f32, f64
• String, &str (via intermediate String)
• Option<T> where T: FromLua / T: IntoLua
• LuaValue (identity — zero-cost passthrough)

Usage in derive macros

The #[lua_methods] macro generates calls to FromLua::from_lua for each parameter and IntoLua::into_lua for the return value, keeping the codegen type-agnostic and user-extensible.

User extensibility

Users can implement FromLua / IntoLua for their own types:

impl FromLua for MyVec3 {
    fn from_lua(value: LuaValue, state: &LuaState) -> Result<Self, String> {
        // extract from userdata or table
    }
}

Traits

FromLua

Convert a LuaValue into a Rust type.

IntoLua

Convert a Rust type into a LuaValue and push it.