Re: M4-converting gsize to std::size_t

[Daniel Boles <dboles src gmail com>]

gssize makes me wonder: it's supposed to be equivalent to ssize_t, but that's a POSIX thing, not a C/C++ one. We would probably get away with using std::ptrdiff_t, but I'm not sure anything is strictly guaranteed here: https://stackoverflow.com/questions/8649018/what-is-the-difference-between-ssize-t-and-ptrdiff-t