Import initial work

.gitignore

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+# Xcode
+#
+# gitignore contributors: remember to update Global/Xcode.gitignore, Objective-C.gitignore & Swift.gitignore
+
+## Build generated
+build/
+DerivedData/
+
+## Various settings
+*.pbxuser
+!default.pbxuser
+*.mode1v3
+!default.mode1v3
+*.mode2v3
+!default.mode2v3
+*.perspectivev3
+!default.perspectivev3
+xcuserdata/
+
+## Other
+*.moved-aside
+*.xccheckout
+*.xcscmblueprint
+
+## Obj-C/Swift specific
+*.hmap
+*.ipa
+*.dSYM.zip
+*.dSYM
+
+## Playgrounds
+timeline.xctimeline
+playground.xcworkspace
+
+# Swift Package Manager
+#
+# Add this line if you want to avoid checking in source code from Swift Package Manager dependencies.
+# Packages/
+# Package.pins
+.build/
+
+# CocoaPods
+#
+# We recommend against adding the Pods directory to your .gitignore. However
+# you should judge for yourself, the pros and cons are mentioned at:
+# https://guides.cocoapods.org/using/using-cocoapods.html#should-i-check-the-pods-directory-into-source-control
+#
+# Pods/
+
+# Carthage
+#
+# Add this line if you want to avoid checking in source code from Carthage dependencies.
+# Carthage/Checkouts
+
+Carthage/Build
+
+# fastlane
+#
+# It is recommended to not store the screenshots in the git repo. Instead, use fastlane to re-generate the
+# screenshots whenever they are needed.
+# For more information about the recommended setup visit:
+# https://docs.fastlane.tools/best-practices/source-control/#source-control
+
+fastlane/report.xml
+fastlane/Preview.html
+fastlane/screenshots
+fastlane/test_output

Package.swift

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+import PackageDescription
+
+let package = Package(
+    name: "i3s",
+    targets: [
+      Target(name: "sharkcwrapper", dependencies:["sharkcpp"]),
+      Target(name: "swift-exec", dependencies:["sharkcwrapper"]),
+    ]
+)

README.md

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+# swift-cpp-package
+Playground project for writing Swift packages which use C++ code
+
+# Prerequesites
+- [Swift 3](https://swift.org/download/)
+
+# Build
+`swift build`
+
+# Run
+`.build/debug/swift-exec`

Sources/sharkcpp/include/shark.h

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+#ifndef __SHARK_H
+#define __SHARK_H
+
+class Shark {
+  private:
+    int id;
+  public:
+    void set_id(int i);
+    int get_id();
+};
+
+#endif

Sources/sharkcpp/shark.cpp

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+#include "shark.h"
+
+void Shark::set_id(int i) {
+  id = i;
+}
+
+int Shark::get_id() {
+  return id;
+}

Sources/sharkcwrapper/cwrapper.cpp

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+#include "shark.h"
+#include "cwrapper.h"
+
+extern "C" {
+  Shark* Shark_new() {
+    return new Shark();
+  }
+
+  void Shark_set_id(Shark* shark, int i) {
+    shark->set_id(i);
+  }
+
+  int Shark_get_id(Shark* shark) {
+    return shark->get_id();
+  }
+
+  void Shark_delete(Shark* shark) {
+    delete shark;
+  }
+}
+

Sources/sharkcwrapper/include/cwrapper.h

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+#ifndef SHARKWRAPPER_H
+#define SHARKWRAPPER_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct Shark Shark;
+
+Shark* Shark_new();
+void Shark_set_id(Shark* shark, int i);
+int Shark_get_id(Shark* shark);
+void Shark_delete(Shark* shark);
+
+#ifdef __cplusplus
+}
+#endif
+#endif
+
+

Sources/swift-exec/main.swift

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+import sharkcwrapper
+
+// Create shark; get pointer
+var shark = Shark_new()
+
+// Set shark ID number
+Shark_set_id(shark, 71)
+
+// Retreive and print shark ID number
+var id = Shark_get_id(shark)
+print("Shark id is \(id)")
+
+// Destroy shark object
+Shark_delete(shark)