This blog reports on how Dropbox uses C++ for cross-platform iOS and Android development.

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All major platforms and operating systems support C++, including server, desktop, embedded, and mobile platforms, and the *nix (including Android), Windows, Mac OS, and iOS OSes, among others. Developers can use C++ to create services with an API for Service-oriented Architecture systems and these services can be compiled and run on virtually any mainstream client and server platform. This approach has several advantages:

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  1. Write most or all non-UI logic in C++ just once and deploy on multiple platforms.
    1. Use Qt (see 3.A) to write cross-platform UIs as well.
  2. There is a very large code base of C++ libraries (sample listing), many of them open-source, that implement a wide range of functionalities.
    1. Full, cross-platform support for standard I/O interfaces, such as file systems (Boost Filesystem), USB (libusb), sockets (Boost asio), REST (C++ REST SDK), TCP, SSL, UDP, HTTP, JSON, XML, STUN, SDP, and SocketIO (LibSourcey), parallel-processing (Boost MPI and Open MPI), interprocess communication (Boost Interprocess), and threading (Boost Thread).
      1. Note: the Boost Filesystem library reads and writes to file systems using an OS-agnostic hierarchy, so you need only write code to navigate directory structures once.
    2. The Boost libraries
    3. The Standard Template Library
    4. Library support for all major databases
    5. Cryptography, such as OpenSSL and Crypto++
    6. Most C libraries
  3. Many technologies beyond platforms and OSes are designed to interact with C++. For example,
    1. The Qt Project includes a C++ IDE and a full set of libraries for cross-platform development including UIs, cloud services, and a Webkit scripting language (QML). QML runs in an app’s built-in browser and links directly to C++ code. The platforms supported include:
      1. Windows, Linux/X11, Mac OS X desktop platforms,
      2. Embedded Android, Embedded Linux, Windows Embedded (Compact and Standard) embedded platforms,
      3. QNX, VxWorks, and INTEGRITY Real-Time Operating Systems,
      4. Android and iOS mobile platforms,
      5. the BlackBerry 10 and Sailfish OS platforms also support Qt, and
      6. there is work in progress for WinRT (including Windows Phone) and Tizen support Qt.
    2. The Boost libraries contain a Python library that allows C++ code and Python to interoperate seamlessly.
    3. The vast majority of scripting and compiled languages allow the calling of an executable, such as one written in C++.
  4. There is a rich assortment of free, sophisticated C++ compilers, IDEs, and tools.
  5. C++ gives developers complete control over memory management, unlike Java. Objective C offers this, but it requires extra effort, and is not highly portable outside of Apple systems.
  6. If designing a custom client-server interaction, C++ interface code can be written for both sides, which has the benefit of using shared code and shared assumptions.
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