Add more example

examples/reference-wrappers/build.rs

@@ -9,7 +9,8 @@
 fn main() -> miette::Result<()> {
     let path = std::path::PathBuf::from("src");
     let mut b = autocxx_build::Builder::new("src/main.rs", &[&path]).build()?;
-    b.flag_if_supported("-std=c++14").compile("autocxx-reference-wrapper-example");
+    b.flag_if_supported("-std=c++14")
+    .file("src/input.cc").compile("autocxx-reference-wrapper-example");
 
     println!("cargo:rerun-if-changed=src/main.rs");
     println!("cargo:rerun-if-changed=src/input.h");

examples/reference-wrappers/src/input.cc

@@ -0,0 +1,11 @@
+// Copyright 2020 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+#include "input.h"
+
+Goat the_goat;

examples/reference-wrappers/src/input.h

@@ -22,10 +22,21 @@ class Goat {
     uint32_t horns;
 };
 
+
 inline void Goat::add_a_horn() { horns++; }
 inline std::string Goat::describe() const {
     std::ostringstream oss;
     std::string plural = horns == 1 ? "" : "s";
     oss << "This goat has " << horns << " horn" << plural << ".";
     return oss.str();
 }
+
+class Field {
+public:
+    const Goat& get_goat() const {
+        return the_goat;
+    }
+
+private:
+    Goat the_goat;
+};

examples/reference-wrappers/src/main.rs

@@ -11,6 +11,7 @@ include_cpp! {
     #include "input.h"
     safety!(unsafe_references_wrapped)
     generate!("Goat")
+    generate!("Field")
 }
 
 fn main() {
@@ -26,4 +27,6 @@ fn main() {
             .to_string_lossy(),
         "This goat has 2 horns."
     );
+    let mut field = ffi::Field::new().within_box();
+    let another_goat = field.get_goat();
 }