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    Are you sure that brace enclosed initializer list can be used in normal assigment beyond variable/const init ? Commented Feb 12, 2017 at 12:07
  • Actually, no I'm not. The only difference I see here is the library available on the Arduino Playground has the channel selects defined as external (extern) and defined outside the class. Commented Feb 12, 2017 at 12:31
  • Aha, the channel select is static init ? So add type: uint8_t CD74HC4067::channelSelects[16][4] = { .... }; Commented Feb 12, 2017 at 19:10