View Compilation Error

0_0_8719470_21713.cpp: In function `int segment_intersect(node, node, node, node)':
0_0_8719470_21713.cpp:84: error: `cross' undeclared (first use this function)
0_0_8719470_21713.cpp:84: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_8719470_21713.cpp: In function `bool seg_crosscheck(node, node, node, node)':
0_0_8719470_21713.cpp:95: error: `cross' undeclared (first use this function)
0_0_8719470_21713.cpp:105: error: `betweencmp' undeclared (first use this function)