Expand description
Macros and helper functions for the C FFI layer.
This module provides the internal infrastructure used by the *_c modules to implement
extern "C" functions. It defines:
- Return code constants:
DIFFSOL_OK(0),DIFFSOL_ERR(-1),DIFFSOL_BAD_ARG(-2). - Conversion traits
CMapTo<Out>/CMapFrom<In>for mapping between Rust and C types. - Helper functions for common patterns:
map_get,map_set,invalid_arg_at,error_at,null_err_at,valid_f64_ptr. - Convenience macros:
c_invalid_arg!,c_error!,c_null_err!,c_getter_simple!,c_setter_simple!.
This module is not intended for external use; it exists to share boilerplate across the
_c modules.