Searches one row for a value
[C++]
size_t find_in_row(
   const T& t,
   size_t row
) const;
Value to be matched.
Row coordinate.
The column of the first cell in the row that contains a matching value. 
            matrix<T>::npos is returned if no match is found.
The specified row of the matrix is searched, left to right, until
            
            at which point at(row, col) == t
col is returned.
Header: matrix.h