Binary Search for 2D vector

[infantheartlyjes]

I am trying to write code for Binary search program on a 2D vector. I tried code. But I can't understand what is the error I have got. I have given below my code and errors.

 class BINARY_ON
{
	public:
  explicit BINARY_ON(int column,string fCol) :m_column(column),fColType(fCol) {}
 
  bool operator()(const string& lhs,const vector<string>& rhs)
  {

	if(fColType=="number")
		return atoi(lhs.c_str()) < atoi(rhs[m_column].c_str());					
	else if(fColType=="date")
		return PPCheckTwoDate(lhs, rhs[m_column])<0;
	else
		return lhs < rhs[m_column];	
   }
   private:
   int m_column;
   string fColType;
 
};

int main ()
{
vector<vector<string>> table_data;

// Vector Data Insert

	BINARY_ON compare_column(4,"date");
	
	if (std::binary_search (table_data.begin(), table_data.end(), "01051996", compare_column))
    std::cout << "found!\n"; else std::cout << "not found.\n";
}

I got the below errors.

/usr/include/c++/4.6/bits/stl_algo.h:2416:4: error: no match for call to ‘(PPBINARY_ON) (std::vector<std::basic_string<char> >&, const char [9])’
note: bool PPBINARY_ON::operator()(const string&, const std::vector<std::basic_string<char> >&)
note: no known conversion for argument 1 from ‘std::vector<std::basic_string<char> >’ to ‘const string& {aka const std::basic_string<char>&}’

[Dy7SLyTq]

your going to have to forgive my lack of knowledge but if there is one thing im good at its reading errors and there are some things ive noticed: your compiler is g++ 4.6. could that be the problem? and as to the error: it looks like your trying to convert between vector<string> and string