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  • Integer multiplication is OK on Arduinos, as the ATmegas have a hardware multiplier. But note that some Arduino-compatible boards (Trinket, Digispark, ...) are based on ATtinies, which do not have such multiplier. Commented Jan 25, 2018 at 12:06
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    Arduino libraries relying on C++11 are not that uncommon. Also, a lot of STL containers can be used without dynamic memory allocation. Nothing stops you from creating an std::vector on stack. Commented Jan 25, 2018 at 12:43
  • @EdgarBonet Isn't that only an 8-bit x 8-bit multiplier though? Technically an 8-bit value is not an integer. ;) Commented Jan 25, 2018 at 12:49
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    1. Yes, it's a 8×8→16 bit multiplier. It is used by the compiler to implement all multiplications far more efficiently than a bitwise shift-and-add. Multiplying two ints requires only three 8×8→16 multiplications (two bytes of flash and two CPU cycles each) and a few additions. 2. Technically, both int8_t and an uint8_t are 8-bit integer types. But this is completely unrelated to my first comment. Commented Jan 25, 2018 at 13:06
  • @EdgarBonet Error on my part - it's an integer, just not an "int". :) Commented Jan 25, 2018 at 13:07