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// xerr(insertion)
// inserts the '<<' concatenated elements into std::cerr
// preceded by the name of the source file, and ended by '\n'
// xerr2(insertion, code)
// performs the insertion if X is defined, and (unconditionally)
// executes the statement(s) in `code'. `code' must be valid
// C(++) code.
//
#ifdef XERR
#include <iostream>
#include <iomanip>
#define xerr(insertion) std::cerr << XERR "/" __FILE__ ": " << \
insertion << '\n'
#define xerr2(insertion, b) \
{ std::cerr << XERR "/" __FILE__ ": " << insertion \
<< '\n'; b; }
#else
#define xerr(insertion)
#define xerr2(insertion, b) b
#endif
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