| Rust Type | C++ Type |
|---|
String | rust::String |
&str | rust::Str |
CxxString | std::string |
&[T]/&mut [T] | rust::Slice |
Box<T> | rust::Box<T> |
UniquePtr<T> | std::unique_ptr<T> |
Vec<T> | rust::Vec<T> |
CxxVector<T> | std::vector<T> |
- These types can be used in the fields of shared structs and the arguments and
returns of extern functions.
- Note that Rust’s
String does not map directly to std::string. There are a
few reasons for this:
std::string does not uphold the UTF-8 invariant that String requires.- The two types have different layouts in memory and so can’t be passed
directly between languages.
std::string requires move constructors that don’t match Rust’s move
semantics, so a std::string can’t be passed by value to Rust.