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Florian Fleissner ba79eef4b2 Key union converted to a proper class ... Unions are a C-reminiscense that are better avoided in modern C++. They cause specific problems due to their nature of representing independent types. The way they are used in Kaleidoscope, they can easily be replaced by a class. This enables it to properly work with Key objects in constexpr context where with the old union-based implementation the compiler reported errors when one Key was constructed based on a key_code/flags pair and another one through raw-data. In such a case, the compiler assumes that both Key instances represent something entirely different. This is because unions were never meant for type conversions and the C++ standard considers their use for that purpose as undefined behavior. The new class provides accessor methods for raw-data access and for key_code/flags-data access. This is a breaking change as it is is not possible to replace direct member access patterns like key.raw = 0xFFFF; based on the raw-accessors. For the .keyCode and .flags members, proxy objects are used to enable the generation of suitable deprecations warnings. All direct access via .raw, .keyCode and .flags have been replaced throughout Kaleidoscope. Information on how to upgrade is provided in UPGRADING.md Signed-off-by: Florian Fleissner <florian.fleissner@inpartik.de>		5 years ago
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Cycle.ino	Key union converted to a proper class	5 years ago