Calling a library twice

Projects Programming
1

I'm using an I2C LCD library that calls wire.h without it needing to be done separately.
As I will be using I2C for more than just the LCD, and I may not use the same type of display in the long term, it is useful to have the wire.h called outside the LCD's library. That way I don't have to remember to put it back in if I take out the LCD library.

Are there any consequences of the wire.h library being called twice?

2

Are there any consequences of the wire.h library being called twice?

If you mean are there any consequences of #including it twice, then no, not if is written correctly

Wire.h has the following guard code in it

#ifndef TwoWire_h
#define TwoWire_h
//library code here
#endif

so if the library has already been #included then subsequent #includes are ignored

This is common practice with libraries but cannot be guaranteed to have been used in all cases

3

Include guard.

4

Good news. Thanks for the help.

5

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