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The top level file, calc++.cc, poses no problem.
#include <iostream> #include "driver.hh"
int
main (int argc, char *argv[])
{
int res = 0;
driver drv;
for (int i = 1; i < argc; ++i)
if (argv[i] == std::string ("-p"))
drv.trace_parsing = true;
else if (argv[i] == std::string ("-s"))
drv.trace_scanning = true;
else if (!drv.parse (argv[i]))
std::cout << drv.result << '\n';
else
res = 1;
return res;
}