能穷举函数空间的函数吗？如何表示这些函数？如欧几空间里的点用数对来表示

#include using namespace std; class point { public: point( ) { } point( float x, float y ); float get_x( ); float get_y( ); point operator++( ); point operator++( int a ); point operator--( ); point operator--( int a ); private: float v_x; float h_y; }; point::point( float x,float y ) : v_x( x ), h_y( y ) { } float point::get_x( ) { return v_x; } float point::get_y( ) { return h_y; } point point::operator++ ( ) { if( v_x 0 || v_x > 639 || h_y 0 || h_y > 479 ); else { v_x += 1; h_y += 1; } return *this; } point point::operator++ ( int a ) { if( v_x 0 || v_x > 639 || h_y 0 || h_y > 479 ); else { point temp( v_x, h_y ); v_x += 1; h_y += 1; return temp; } return *this; } point point::operator-- ( ) { if( v_x 1 || v_x > 640 || h_y 1 || h_y > 480 ); else { v_x -= 1; h_y -= 1; } return *this; } point point::operator-- ( int a ) { if( v_x 1 || v_x > 640 || h_y 1 || h_y > 480 ); else { point temp( v_x, h_y ); v_x -= 1; h_y -= 1; return temp; } return *this; } int main( ) { float a, b; cout > a >> b; point p( a, b ); int i; for( i = 0; i