Testing how CXX works (and how to integrate with C++ code)

cxxtest/Cargo.lock

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cxxtest/Cargo.toml

@@ -0,0 +1,12 @@
+[package]
+name = "cxxtest"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+cxx = "1.0.66"
+
+[build-dependencies]
+cxx-build = "1.0.66"

cxxtest/build.rs

@@ -0,0 +1,5 @@
+fn main() {
+    cxx_build::bridge("src/main.rs")
+        .file("src/external/aclass.cpp")
+        .compile("cxxtest");
+}

cxxtest/src/external/aclass.cpp

@@ -0,0 +1,12 @@
+#include "headers/aclass.hpp"
+#include <iostream>
+
+std::unique_ptr<AClass> new_aclass(uint32_t v) {
+  return std::unique_ptr<AClass>(new AClass(v));
+}
+
+AClass::AClass(uint32_t p_value) : a_value(p_value) {}
+
+void AClass::process() const {
+  std::cout << "Processing " << this->a_value << std::endl;
+}

cxxtest/src/external/headers/aclass.hpp

@@ -0,0 +1,19 @@
+#ifndef ACLASS_HPP
+#define ACLASS_HPP
+
+#include <memory>
+#include <stdint.h>
+
+class AClass {
+private:
+  uint32_t a_value;
+
+public:
+  AClass(uint32_t p_value);
+
+  void process() const;
+};
+
+std::unique_ptr<AClass> new_aclass(uint32_t v);
+
+#endif

cxxtest/src/main.rs

@@ -0,0 +1,17 @@
+#[cxx::bridge]
+mod ffi {
+    unsafe extern "C++" {
+        include!("cxxtest/src/external/headers/aclass.hpp");
+
+        type AClass;
+
+        fn new_aclass(value: u32) -> UniquePtr<AClass>;
+        fn process(&self);
+    }
+}
+
+fn main() {
+    println!("Hello, world!");
+    let aclass = ffi::new_aclass(12);
+    aclass.process();
+}