ALIASES += true="<span class='literal'>true</span>"
ALIASES += false="<span class='literal'>false</span>"
ALIASES += NULL="<span class='literal'>NULL</span>"
+ALIASES += NUL="<span class='literal'>NUL</span>"
# NOTE: these are important as you can't write in the docs
# just #ifdef since the # character is used by Doxygen