Return EXIT_FAILURE if one of the compilation units failed

src/main.cpp

@@ -38,6 +38,7 @@ int main(int argc, char* argv[]) {
         outputFileContent(outputFile, transpiledString);
         return transpiledString;
     };
+    int8_t exit_code = EXIT_SUCCESS;
     if (!files.empty()) {
         vector<future<pair<string, optional<Yerbacon::Exception>>>> Units(files.size());
         const launch& Policy = not parallel ? launch::deferred : launch::async;
@@ -66,14 +67,16 @@ int main(int argc, char* argv[]) {
             });
         });
         if (printResult) cout << "~~~~[Yerbacon compilation result]~~~~\n\n";
-        for_each(Units.begin(), Units.end(), [&printResult](future<pair<string, optional<Yerbacon::Exception>>>& currentFuture) {
+        exit_code = none_of(Units.rbegin(), Units.rend(), [&printResult](future<pair<string, optional<Yerbacon::Exception>>>& currentFuture) -> bool {
             const auto&& result = currentFuture.get();
-            if (not result.second.has_value()) {
+            const bool is_exception = result.second.has_value();
+            if (not is_exception) {
                 if (printResult) cout << result.first << '\n';
             } else {
                 cout << "Compilation of " << result.first << " has failed with the following error:\n" << result.second.value().what() << '\n';
             }
-        });
+            return is_exception;
+        }) ? EXIT_SUCCESS : EXIT_FAILURE;
     } else cout << "No valid file provided.\n";
-    return EXIT_SUCCESS;
+    return exit_code;
 }