CPPnCS-Hybrid

Belajar hybrid-programming C# dan C++ dengan Haversine

🌍 Fancy Haversine Distance Calculator (C# + C++ Hybrid)

This project is a hybrid-powered Haversine calculator built with:

• 💻 C# → for the OOP structure, terminal output, and clean logic
• ⚙️ C++ → for math-heavy functions like Haversine::Hav_deg() and calculate_distance() to boost performance

We're blending the beauty of .NET and the raw speed of C++ using DllImport.

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📁 Project Structure

.                     # C# files (flatted)
├── Program.cs          # Main entry point
├── Location.cs         # Represents a coordinate (lat, lon)
├── Distance.cs         # Distance calculator (calls C++ backend)
├── Haversine.cs        # \[Replaced by native C++]
├── Symbols.cs          # Greek and math symbols
├── Misc.cs             # Terminal formatting, etc.
└── NativeInterop.cs    # DllImport for calling C++ functions

.\test                # Testing files
├── Program_test.cs     # Testing för Main entry point
├── Hello.cpp           # Testing för Represents a coordinate (lat, lon)
├── Hello.ll            # Compiled to LLVM Intermediate Level
└── Hello.dll           # Comepiled thing

.\SRC_CPP             # C++ Files
├── Distance.h 
├── Haversine.h           # C++ haversine functions (deg2rad, hav, etc)
├── Includes.h            # Shared includes
├── Location.h            # Location object stuffs
├── Main.cpp              # Main file
├── Misc.h                # Greek and math symbols
└── Symbols.h             # Unicode + ANSI codes

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🧪 Features

• 🌐 Convert degrees to radians
• 📏 Calculate Haversine value (in degrees or radians)
• 🧠 Move heavy calculations to C++ for better performance
• 📦 Pure DLL-based interop (no C++/CLI, no COM hell)

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🛠️ Build Instructions

🧩 C++ (DLL Build)

With Clang (recommended):

clang++ -shared -o CPP_Main.dll .\CPP_SRC\CPP_Main.cpp -O3 -static -fPIC

With MSVC (Visual Studio Command Prompt):

cl /LD CPP_Main.cpp /I. /O2 /FeCPP_Main.dll

Make sure to place the resulting CPP_Main.dll in your C# project’s output folder (bin/Debug/...).

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🧠 C# (Call from DLL)

Inside Program.cs:

[DllImport("CPP_Main.dll", CallingConvention = CallingConvention.Cdecl)]
public static extern double hav_deg(double angle);

Then call it in your app:

double result = hav_deg(60.0);
Console.WriteLine($"Hav(60°) = {result}");

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⚠️ Gotchas

• Make sure architecture matches (x64 vs x86)
• Don't use C++ std::string, fmt, or classes directly through interop — keep exported functions extern "C" and C-style
• If you use fmt::println() in C++, make sure fmt is linked properly (or comment it out during interop)

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🚀 Future Ideas

• Export full calculate_distance(lat1, lon1, lat2, lon2)
• Benchmark C# only vs C# + C++ hybrid
• Create a GUI (e.g., WinForms/WPF) for interactive geo distance calculator
• Add multi-threaded batch distance calculations in C++

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💬 Credits

Built with caffeine, a love for both high-level structure and low-level control, and pure curiosity for hybrid programming.

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🔗 License

MIT

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