No matching function for call to 'min(uint32_t&, unsigned int)'

[mirzafahad]

Hi,

I was using an AVR Arduino with Adafruit's E-Ink Display library. Everything was fine. When I switched to STM32 Arduino Core (using Nucleo-64 L053R8) it threw an error saying:

Adafruit_ACeP.cpp:131:53: error: no matching function for call to 'min(uint32_t&, unsigned int)'
  131 |     uint32_t numbytes = min(remaining, sizeof(block));

Seems like min() is not defined. For now, I added this line in their library:

#undef min
inline int min(uint32_t a, unsigned int b) { return ((a) < (b) ? (a) : (b)); }

That seems to work for now. But what would be the right way to fix this issue?

-Fahad

[fpistm]

Hi @mirzafahad,
The core uses the STL C++.
min, max,... require to compare same type.

The Adafruit's E-Ink Display library needs some updates to avoid this kind of issue and harden the code.
uint32_t numbytes = min(remaining, (uint32_t)sizeof(block));
You should open an issue to this repo to fix all min/max call.

[mirzafahad]

Make sense. Thanks.