Function to_sexp 

pub unsafe fn to_sexp<T>(x: T) -> SEXP
where
    T: IntoR,

Convert a Rust value to an R SEXP.

Calls IntoR::into_sexp to produce an R value. Used in trait ABI method shims for the result, and by a trait’s View for each argument, which the shim reads back with TryFromSexp (or TryFromRoot for borrowed views). So a trait-method parameter type needs both directions: the reading markers cross as their inner value (AsNumeric as Option<f64>, and so on) and AsFromStr as its text; Missing<T> goes through missing_to_sexp instead. Parameter checks such as no_na run in the implementing method’s R-facing wrappers, so they check R arguments, not the typed values a View caller passes.

Type Parameters

• T - Source Rust type (must implement IntoR)

Arguments

• x - Rust value to convert

Returns

R SEXP representation of the value.

Safety

• Must be called on R’s main thread
• The returned SEXP must be protected if used across R allocations

Example

// In a method shim:
let result: f64 = self_ref.area();
unsafe { to_sexp(result) }