intersectii.cpp:8: error: 'null_type' was not declared in this scope intersectii.cpp:11: error: template argument 2 is invalid intersectii.cpp:12: error: invalid type in declaration before ';' token intersectii.cpp: In function 'int main()': intersectii.cpp:33: warning: extended initializer lists only available with -std=c++0x or -std=gnu++0x intersectii.cpp:33: warning: extended initializer lists only available with -std=c++0x or -std=gnu++0x intersectii.cpp:33: warning: extended initializer lists only available with -std=c++0x or -std=gnu++0x intersectii.cpp:33: warning: extended initializer lists only available with -std=c++0x or -std=gnu++0x intersectii.cpp:37: warning: extended initializer lists only available with -std=c++0x or -std=gnu++0x intersectii.cpp:37: warning: extended initializer lists only available with -std=c++0x or -std=gnu++0x intersectii.cpp:33: warning: unused variable 'points'