Inline function as a class method

I developed my own Matrix class. Constructor reads a matrix from file. Matrix has free cells and "walls". Also constructor reads start and finish points for Breadth first search (to find the shortest way from Start_point to Finish_Point). Here is code of header:

//MyMatrix.h file

#ifndef __MYMATRIX_H__ #define __MYMATRIX_H__ #include <tchar.h> #include <iostream> #include <deque> //using namespace std; #define MAX_MATRIX_SIZE 1000 #define FREE_CELL_SIGNIFICATION '0' #define BALL_SIGNIFICATION 'B' #define UP_SIGNIFICATION 'U' #define DOWN_SIGNIFICATION 'D' #define LEFT_SIGNIFICATION 'L' #define RIGHT_SIGNIFICATION 'R' #define START_POINT_SIGNIFICATION 'S' #define FINISH_POINT_SIGNIFICATION 'F' typedef std::pair<int,int> Field_Point_Type; //#define IS_RIGHT_NEIGHBOUR_REACHABLE(Current_Point) (((Current_Point.second+1) <= Column_Count)&&((Matrix_Field[Current_Point.first][Current_Point.second+1]==FREE_CELL_SIGNIFICATION)||(Matrix_Field[Current_Point.first][Current_Point.second+1]==FINISH_POINT_SIGNIFICATION))) ? true : false; class Matrix { private: int Column_Count; //Cols int Row_Count;//Rows char** Matrix_Field; Field_Point_Type Start_Point; Field_Point_Type Finish_Point; bool Matrix_Is_Correct; public: Matrix(_TCHAR* Input_File_Name); int Breadth_first_search(unsigned int Start_X,unsigned int Start_Y,unsigned int Finish_X,unsigned int Finish_Y); ~Matrix(); inline int IS_RIGHT_NEIGHBOUR_REACHABLE(Field_Point_Type Current_Point); }; 

//MyMatrix.cpp file

... inline int Matrix::IS_RIGHT_NEIGHBOUR_REACHABLE(Field_Point_Type Current_Point) { return (((Current_Point.second+1) <= Column_Count)&&((Matrix_Field[Current_Point.first][Current_Point.second+1]==FREE_CELL_SIGNIFICATION)||(Matrix_Field[Current_Point.first][Current_Point.second+1]==FINISH_POINT_SIGNIFICATION))) ? true : false; } ... 

I'd like to define are the neighbour cells free for the next step of algorithm. Of course I can use such code for this:

if (((Current_Point.second+1) <= Column_Count)&&((Matrix_Field[Current_Point.first][Current_Point.second+1]==FREE_CELL_SIGNIFICATION)||(Matrix_Field[Current_Point.first][Current_Point.second+1]==FINISH_POINT_SIGNIFICATION))) { //Adding of right cell to deque... ... } 

but it looks ugly. I am going to add such checks for left, up and down cells. I'd like to implement inline functions (like this: inline int IS_RIGHT_NEIGHBOUR_REACHABLE(Field_Point_Type Current_Point);).

if (IS_RIGHT_NEIGHBOUR_REACHABLE(Current_Point)) { //Adding of right cell to deque... ... } 

It looks much better! But I haven't use such definition of inline function before and discovered it accidentally. Is it good programming style? Is it better to develop simple int IS_RIGHT_NEIGHBOUR_REACHABLE(Field_Point_Type Current_Point); method within my class? Is it better to leave such check:

if (((Current_Point.second+1) <= Column_Count)&&((Matrix_Field[Current_Point.first][Current_Point.second+1]==FREE_CELL_SIGNIFICATION)||(Matrix_Field[Current_Point.first][Current_Point.second+1]==FINISH_POINT_SIGNIFICATION))) { //Adding of right cell to deque... ... }