Compilation error: " ‘size_t’ has not been declared "

Projects Programming
1

Hi all:
I receive the following error on compile/verify (see below). Some similar threads have correlated it to not including Arduino.h. I have, however, included & not included it within my primary sketch and the offending .cpp file. Why would size_t not be defined within Arduino.h, and why would the error arise within this .cpp when no change has been made to it? I can provide additional info as required. I am looking for understanding as much as I am searching for the solution to my issue.
FYI--the lib I'm writing is not SimpleTimer as the error below may incline someone to believe. Thanks!
-Chris

In file included from /home/cdaringe/Desktop/arduino-1.0.5/hardware/tools/avr/bin/../lib/gcc/avr/4.3.2/../../../avr/include/stdlib.h:47,
                 from /home/cdaringe/Desktop/arduino-1.0.5/hardware/arduino/cores/arduino/Arduino.h:4,
                 from SimpleTimer.h:32,
                 from SimpleTimer.cpp:27:
/home/cdaringe/Desktop/arduino-1.0.5/hardware/tools/avr/bin/../lib/gcc/avr/4.3.2/include/stddef.h:214: error: expected constructor, destructor, or type conversion before ‘typedef’
In file included from /home/cdaringe/Desktop/arduino-1.0.5/hardware/arduino/cores/arduino/Arduino.h:4,
                 from SimpleTimer.h:32,
                 from SimpleTimer.cpp:27:
/home/cdaringe/Desktop/arduino-1.0.5/hardware/tools/avr/bin/../lib/gcc/avr/4.3.2/../../../avr/include/stdlib.h:143: error: ‘size_t’ has not been declared
2

You need to post the code you are trying to compile, so others, on other operating systems, can try to reproduce your problem.

3

All #includes have to be listed in full in the sketch - the Arduino compilation strategy
first copies all the included libraries and your sketch files to a blank directory, then
compiles them there. It gets the list of what to copy from your sketch file, it doesn't
walk the #includes recursively.

This means if library A uses library B you have to #include A and B in the sketchfile
at the top.

This is likely the cause of your error.

4

Hi guys. Thanks for the responses. Not sure which did it, but one of the following two did the trick: re-arranged the order at which I did my .h includes, and also replaced the .h & .cpp files as I feared I may have edited them unintentionally. Regardless, compiles now! Thanks!