is >> s1 >> s2 >> s3;
if (!is)
return false;
+ if (s2.size() != 1)
+ return false;
MathArray ar1, ar3;
mathed_parse_cell(ar1, s1);
mathed_parse_cell(ar3, s3);
- if (ar1.size() != 1 || s2.size() != 1 || ar3.size() !=1)
+ if (ar1.size() != 1 || ar3.size() != 1)
return false;
from1_ = ar1.front();
from2_ = s2[0];