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Jomelo / LCDMenuLib2

Create a tree menu. Use it with different lcd types / console output / ssh console.
MIT License
249 stars 46 forks source link

Support for C++ callbacks #59

Closed moritz89 closed 3 years ago

moritz89 commented 4 years ago

Has the possibility been investigated to add support for C++ style callbacks? std::bind from ?

This would allow the callbacks to be realized as member classes, thereby being able to use member variables with references to the LCDMenuLib2 and U8G2.

Jomelo commented 4 years ago

Hello, i am comming from the c world, i think i have to read some theory parts to work with this things ;-)

moritz89 commented 4 years ago

Oh, then it is a quite big change. Fundamentally, it is not possible to cast a C++ function to a C style function. The closest workaround that I've found is creating a C function wrapper to call my C++ function:

void mFunc_information(uint8_t param) { lcdml_utils.information(param); }
LCDML_add(0, LCDML_0, 1, "Information", mFunc_information);

mFunc_information is passed to LCDML_add and lcdml_utils is an instance of the LcdmlUtils class that I wrote.

The reason I'm asking is because the TaskScheduler library also has a object oriented (C++) interface.