function testpl {
  rm report.html ring.hpp.gch -f
  clang++ -std=c++1z -fprofile-instr-generate -fcoverage-mapping *.cpp -o test
  ./test
  llvm-profdata merge -o test.profdata default.profraw
  llvm-cov report test -instr-profile=test.profdata
  llvm-cov show test -instr-profile=test.profdata -format=html > report.html
  opera report.html
  rm test* *.profraw -f
}