Enum ReturnStrategy 

pub enum ReturnStrategy {
    ReturnSelf,
    ChainableMutation,
    Direct,
}

Return handling strategy for class methods.

Determines how the R wrapper function processes and returns the .Call() result. Each class system generator uses this to produce idiomatic R return code.

Variants

ReturnSelf

The method returns Self. The wrapper wraps the raw pointer result with the appropriate class attribute or creates a new class object (e.g., R6Class$new(.ptr = result) or structure(result, class = "...")).

ChainableMutation

The method is a &mut self method returning (). The wrapper calls the .Call() for its side effect and returns the receiver (self/x) for method chaining (e.g., invisible(self) for R6).

Direct

Default strategy: return the .Call() result directly without wrapping.

Implementations

impl ReturnStrategy

pub fn for_method(method: &ParsedMethod) -> Self

Determine the return strategy for a parsed method.

• Methods that return Self, Result<Self, E>, or Option<Self> use ReturnSelf. For the latter two, the C wrapper already raised on Err / None (see crate::c_wrapper_builder::ReturnHandling::ResultExternalPtr and crate::c_wrapper_builder::ReturnHandling::OptionExternalPtr), so a successful .val is a bare ExternalPtr — identical in shape to the bare-Self case — and gets the same class-wrapping tail.
• In-place builders (&mut self -> &mut Self / &self -> Self) and &mut self -> () methods use ChainableMutation. Both return the receiver object (x / invisible(self)) so the call composes under the native pipe (obj |> set_a(1) |> set_b(2)); the C wrapper hands back the same ExternalPtr handle (see crate::c_wrapper_builder::ReturnHandling::SelfHandle).
• All other methods use Direct

Trait Implementations

impl Clone for ReturnStrategy

fn clone(&self) -> ReturnStrategy

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for ReturnStrategy

impl Debug for ReturnStrategy

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for ReturnStrategy

#[doc(hidden)]

fn assert_fields_are_eq(&self)

🔬This is a nightly-only experimental API. (derive_eq_internals)

#[doc(hidden)]

fn assert_receiver_is_total_eq(&self)

👎Deprecated since 1.95.0:

implementation detail of #[derive(Eq)]

impl PartialEq for ReturnStrategy

fn eq(&self, other: &ReturnStrategy) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for ReturnStrategy

impl TrivialClone for ReturnStrategy

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 1 byte

Size for each variant:

• ReturnSelf: 0 bytes
• ChainableMutation: 0 bytes
• Direct: 0 bytes