The cost of pumping a C++ version is also much higher. For C, you lose support for older compilers and minor platforms that haven't catched up, but if this isn'

The cost of pumping a C++ version is also much higher. For C, you lose support for older compilers and minor platforms that haven't catched up, but if this isn't a problem, then only very minor (or no) modifications to the source should be required. Newer features can then be used gradually where it makes sense.