Historical and obscure machines aside, there are a few things modern C++ code should take for granted, because even new systems will probably not bother breakin

Historical and obscure machines aside, there are a few things modern C++ code should take for granted, because even new systems will probably not bother breaking them: Text is encoded in UTF-8. Negative integers are twos-complement. Float is 32 bit ieee 754, double and long double are 64 bit ieee 754. Char is 8 bit, short is 16 bit, int is 32 bit, long long is 64 bit.