Function parseOp

sample/Terminate.cpp:12–25

};

Op parseOp(char t)
{
  using namespace matchit;
  Id<char> token;
  return match(t)(
      pattern | '+' = expr(Op::Add), pattern | '-' = expr(Op::Sub),
      pattern | '*' = expr(Op::Mul), pattern | '/' = expr(Op::Div),
      pattern | token = [&]
      {
        std::cerr << "Unexpected: " << *token;
        std::terminate();
        return Op::Add;
      });
}

int32_t main()
{