extendr_api::robj::into_robj::repeat_into_robj

Macro impl_synonym_type

Source 
macro_rules! impl_synonym_type {
    ($type: ty, $synonym_type: ty) => { ... };
}
Expand description

Generates a ToVectorValue for a type, by inheriting the properties of another type’s ToVectorValue’s implementation.

This is meant to be used for wrappers of types that may be represented in R. The marshalling rules for this is represented in ToVectorValue, and this macro merely co-opts

Arguments:

  • $type - Target type
  • $synonym_type - A type that has a ToVectorValue-impl, and an inner-method.

Requirements: $type must have an inner-method to extract the wrapped value. It suffices that $type implements Scalar<T>.

Example usage:

ⓘ
impl_synonym_type(Rint, i32);

The example here implements

impl ToVectorValue for Rint,

this entails that Rint would be stored in R exactly as i32.