add cpp-interop solution

Author: miguelraz

exercise-solutions/Cargo.lock

@@ -12,6 +12,4 @@ members = [
   "tcp-server-exercises",
   "async-chat",
   "kani-linked-list",
-  "iterators",
-  "calculator/*",
 ]

exercise-solutions/Cargo.toml

@@ -0,0 +1,13 @@
+[package]
+name = "auto-rapid"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+autocxx = "0.27.1"
+cxx = "1.0"
+
+[build-dependencies]
+autocxx-build = "0.27.1"
+miette = { version = "5", features = ["fancy"] } # optional but gives nicer error messages!
+

exercise-solutions/cpp-interop/Cargo.toml

@@ -0,0 +1,14 @@
+fn main() -> miette::Result<()> {
+    let include_path = std::path::PathBuf::from("src");
+
+    // This assumes all your C++ bindings are in main.rs
+    let mut b = autocxx_build::Builder::new("src/main.rs", [&include_path]).build()?;
+    b.flag_if_supported("-std=c++20")
+     .compile("autocxx-demo"); // arbitrary library name, pick anything
+    println!("cargo:rerun-if-changed=src/main.rs");
+
+    // Add instructions to link to any C++ libraries you need.
+
+    Ok(())
+}
+

exercise-solutions/cpp-interop/build.rs

@@ -0,0 +1,7 @@
+Date,Open,High,Low,Close,Volume,Adj Close
+2017-02-24,64.529999,64.800003,64.139999,64.620003,21705200,64.620003
+2017-02-23,64.419998,64.730003,64.190002,64.620003,20235200,64.620003
+2017-02-22,64.330002,64.389999,64.050003,64.360001,19259700,64.360001
+2017-02-21,64.610001,64.949997,64.449997,64.489998,19384900,64.489998
+2017-02-17,64.470001,64.690002,64.300003,64.620003,21234600,64.620003
+

exercise-solutions/cpp-interop/example.csv

@@ -0,0 +1,32 @@
+use autocxx::prelude::*;
+use cxx::{let_cxx_string, CxxString};
+use ffi::rapidcsv::Document;
+
+autocxx::include_cpp! {
+    #include "wrapper.h"
+    generate!("rapidcsv::Document")
+    generate!("my_csv::open_csv")
+    generate!("my_csv::get_string_cell")
+    safety!(unsafe_ffi)
+}
+
+fn main() {
+    let_cxx_string!(file_name = "example.csv");
+    let doc = ffi::my_csv::open_csv(&file_name).within_unique_ptr();
+    let count = doc.GetRowCount();
+    for i in 0..count {
+        let date = doc.get_string_cell(0, i);
+        println!("{}", date);
+    }
+}
+
+trait GetStringCell {
+    fn get_string_cell(&self, column: usize, row: usize) -> UniquePtr<CxxString>;
+}
+
+impl GetStringCell for Document {
+    fn get_string_cell(&self, column: usize, row: usize) -> UniquePtr<CxxString> {
+        ffi::my_csv::get_string_cell(self, column, row)
+    }
+}
+

exercise-solutions/cpp-interop/src/main.rs

@@ -0,0 +1,13 @@
+#pragma once
+
+#include "rapidcsv.h"
+
+namespace my_csv {
+    rapidcsv::Document open_csv(const std::string& pPath) {
+        return rapidcsv::Document(pPath);
+    }
+
+    std::string get_string_cell(const rapidcsv::Document& doc,const size_t pColumnIdx, const size_t pRowIdx) {
+        return doc.GetCell<std::string>(pColumnIdx, pRowIdx);
+    }
+}