Adding the -lunwind library to the linker solved that issue. The calculation engine relies on the use of exceptions to handle cases such as divisions by zero, making the app crash in such conditions. Clang however does not have that and the code that relied on it needed some adjustments to use normal arrays.īuild scripts are used for iOS and WebAssembly to generate their native payloads, whereas Windows and Android use their own C++ Visual Studio projects for integration.Īndroid’s NDK also has its surprises, where the handling of exceptions is not enabled by default for NDKs below r19 for ARM32 ABIs. This feature is not supported in C++ (for good reasons), but Microsoft engineers added an exclusion for that feature. Most of this part of the code did not need to be updated, except for the use of the C99 flexible array member feature. The code is encapsulated using the CalculatorManager class, an IResourceProvider callback interface and ICalcDisplay UI updates callbacks interface. The main reason for keeping C++ code as-is is the use of pointers and low-level memory techniques that do not map easily to C#, but also the fact that the Calculation Engine does not use any UI directly. Challenge #1: Adjusing the C++ of the Calculation Engine In the following part we will dissect the challenges we needed to solve in order to port this code to Web, via WebAssembly support of Uno Platform, as well as native iOS and Android apps.
Others needed to be adjusted to be compliant with clang’s C++ 11 support.
The Uno Platform being developed in C#, to be able to support the Calculator on iOS, Android and WebAssembly, some parts of the code needed to be translated to C#. It also boasts responsive design for windowed and orientation-aware devices, with buttons and history dynamic visibility, localization for 65 languages, narrator/voice-over accessibility support, clipboard support, etc… Second, the calculator contains features such as: Standard mode, Scientific mode, a Programmer mode with multiple bases conversion, shifting operations, and an interactive bit field view, Dates calculator, a large set of converters (currency, volume, length, temperature, angles, …), infinite precision arithmetic operations, an expression view with parenthesis support, a history view with selectable items, and an editable memory view. Historically, parts of the C++ code were actually built in C. However, the calculator is complex both in the way it was coded over the years, as well as the advanced functions it has.įirst, it’s built entirely using standard C++ 11 and C++/CX, with a calculation engine that dates back from 1995. Of course, that is a good UX choice Microsoft made as most uses of the calculator are rather simple ones. The simple initial UI you see upon launch can be deceiving. The Windows Calculator is an interesting and not-so-simple piece of software. Windows 10 – well, just open it on Windows 10 ?.
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