nkd.cpp:12: error: '>>' should be '> >' within a nested template argument list nkd.cpp: In function 'int main()': nkd.cpp:25: error: 'nullptr' was not declared in this scope nkd.cpp:41: error: expected primary-expression before '{' token nkd.cpp:41: error: expected ']' before '{' token nkd.cpp:41: error: expected ';' before '{' token nkd.cpp:69: error: expected '}' at end of input nkd.cpp:69: error: expected '}' at end of input