Defined shortcut of Serial.print(F(msg))

Projects Programming
1

I 'm trying to define a sortcut of Serial.print
Without F() it works as expcted...I can't understand why F() throughs errors...

#define log(msg) Serial.print(F(msg))
#define logln(msg) Serial.println(F(msg))

file.cpp:269:5: note: in expansion of macro 'log'

log(number);

^

C:\Program Files (x86)\Arduino\hardware\arduino\avr\cores\arduino/WString.h:38:74: error: array must be initialized with a brace-enclosed initializer

#define F(string_literal) (reinterpret_cast<const __FlashStringHelper *>(PSTR(string_literal)))

^

file.h:19:31: note: in expansion of macro 'F'

#define log(msg) Serial.print(F(msg))

Any help???

2

F() Works with c-strings not numbers

Edit: constant c-strings

3

And it doesn't work with all C strings... Only string literals: characters between double-quotes.

It can't work with variables since putting a variable in READ ONLY MEMORY makes it no longer variable.

4

Indeed