Module c_wrapper_builder 

Unified C wrapper generation for standalone functions and impl methods.

This module provides shared infrastructure for generating C wrappers that:

• Handle worker thread vs main thread execution strategies
• Perform parameter conversion from SEXP to Rust types
• Convert Rust return values back to SEXP
• Properly handle panics and R errors

The same infrastructure is used by both #[miniextendr] on standalone functions and #[miniextendr(env|r6|s3|s4|s7)] on impl blocks.

Structs

CWrapperContext

All information needed to generate a C wrapper function for an R-exported Rust item.

CWrapperContextBuilder

Builder for CWrapperContext.

Enums

ErrPartsMode

How the generated Err arm turns an error value into condition parts (message, class vector, structured data).

ReturnHandling

Strategy for converting a Rust return value into an R SEXP.

ThreadStrategy

Thread execution strategy for C wrappers.

Functions

detect_return_handling

Detects the ReturnHandling strategy from a return type: the one rule for standalone functions, inherent methods and trait methods.

detect_return_handling_from_type 🔒

Determines the ReturnHandling variant for a concrete syn::Type.

first_type_argument 🔒

Extracts the first generic type argument from a path segment’s angle-bracketed arguments.