Common C++ classes and routines used by my applications such as argument parser, IO and conversion utilities
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// assume __gnu_cxx::stdio_filebuf is available if this program compiles
#include <ext/stdio_filebuf.h>
#include <iostream>
int main() {
const int fd = 0;
__gnu_cxx::stdio_filebuf<char> buf(fd, std::ios_base::in);
return buf.fd();
}