Port HaversineDistance to C++ for use on other platforms

.gitignore

@@ -1,5 +1,9 @@
 .DS_Store
 /.build
+/build
 /Packages
-/*.xcodeproj
 xcuserdata/
+DerivedData/
+.swiftpm/configuration/registries.json
+.swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
+.netrc

CMakeLists.txt

@@ -0,0 +1,16 @@
+cmake_minimum_required(VERSION 3.26)
+project(haversine LANGUAGES CXX)
+
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+set(CMAKE_CXX_STANDARD 11)
+
+include_directories("${CMAKE_CURRENT_SOURCE_DIR}/src/include")
+
+set(SOURCES
+    src/haversineFormula.cpp
+
+    src/include/haversineFormula.h
+)
+
+add_library(haversine ${SOURCES})
+target_include_directories(haversine PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/src")

LICENSE.md

@@ -1,7 +1,21 @@
-Copyright 2018 tmn
+MIT License
 
-Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+Copyright (c) 2023 Tri Nguyen
 
-The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
 
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

Package.swift

@@ -1,4 +1,4 @@
-// swift-tools-version:5.2
+// swift-tools-version: 5.9
 // The swift-tools-version declares the minimum version of Swift required to build this package.
 
 import PackageDescription
@@ -7,15 +7,19 @@ let package = Package(
     name: "HaversineDistance",
     products: [
         .library(
-            name: "HaversineDistance",
-            targets: ["HaversineDistance"]),
+            name: "haversineFormula",
+            targets: ["haversineFormula"]),
     ],
     targets: [
         .target(
-            name: "HaversineDistance",
-            dependencies: []),
+            name: "haversineFormula",
+            path: "src",
+            swiftSettings: [.interoperabilityMode(.Cxx)]
+        ),
         .testTarget(
-            name: "HaversineDistanceTests",
-            dependencies: ["HaversineDistance"]),
+            name: "haversineFormulaTests",
+            dependencies: ["haversineFormula"],
+            swiftSettings: [.interoperabilityMode(.Cxx)]
+        ),
     ]
 )

Tests/HaversineDistanceTests/haversineFormulaTests.swift

@@ -0,0 +1,17 @@
+import XCTest
+@testable import haversineFormula
+
+final class HaversineDistanceTests: XCTestCase {
+    func testDistance() {
+        let distance = Haversine.distance(
+            Location(lat: 59.890465, lon: 10.523493),
+            Location(lat: 59.904499, lon: 10.786372)
+        )
+
+        XCTAssertEqual(distance, 1474.35)
+    }
+
+    static var allTests = [
+        ("testDistance", testDistance)
+    ]
+}

src/haversineFormula.cpp

@@ -0,0 +1,31 @@
+#include "haversineFormula.h"
+
+
+Haversine::Haversine()
+{
+
+}
+
+Haversine::~Haversine()
+{
+
+}
+
+double Haversine::to_radians(double degree)
+{
+    return degree * M_PI / 180;
+}
+
+double Haversine::distance(Location start, Location end)
+{
+    double φ1 = to_radians(start.lat);
+    double φ2 = to_radians(end.lat);
+    double δφ = to_radians(end.lat - start.lat);
+    double δλ = to_radians(end.lon - start.lon);
+
+    double a = sin(δφ / 2.0) * sin(δφ / 2.0)
+        + cos(φ1) * cos(φ2) * sin(δλ / 2.0) * sin(δλ / 2.0);
+    double c = 2.0 * asin(sqrt(a));
+
+    return round(637100.0 * c * 100)/100;
+}

src/include/haversineFormula.h

@@ -0,0 +1,21 @@
+#pragma once
+
+#include <math.h>
+
+struct Location
+{
+    double lat;
+    double lon;
+};
+
+class Haversine
+{
+public:
+    Haversine();
+    ~Haversine();
+
+    static double distance(Location start, Location end);
+
+private:
+    static double to_radians(double degree);
+};