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Add example to function pointer.

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This commit is contained in:
Stephen Chung
2020-10-15 20:05:23 +08:00
parent a6fa94d946
commit ea9ef1091a
4 changed files with 62 additions and 10 deletions
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5
doc/src/rust/register-raw.md
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@@ -59,7 +59,8 @@ Function Signature
The function signature passed to `Engine::register_raw_fn` takes the following form:
> `Fn(engine: &Engine, lib: &Module, args: &mut [&mut Dynamic]) -> Result<T, Box<EvalAltResult>> + 'static`
> `Fn(engine: &Engine, lib: &Module, args: &mut [&mut Dynamic])`
> `-> Result<T, Box<EvalAltResult>> + 'static`
where:
@@ -117,7 +118,7 @@ engine.register_raw_fn(
std::any::TypeId::of::<FnPtr>(),
std::any::TypeId::of::<i64>(),
],
move |engine: &Engine, lib: &Module, args: &mut [&mut Dynamic]| {
|engine: &Engine, lib: &Module, args: &mut [&mut Dynamic]| {
// 'args' is guaranteed to contain enough arguments of the correct types
let fp = std::mem::take(args[1]).cast::<FnPtr>(); // 2nd argument - function pointer