Compilare: user.cpp: In member function ‘input_reader& input_reader::operator>>(char*)’: user.cpp:68:22: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] *str_pos = NULL; ^ user.cpp: In member function ‘input_reader input_reader::reset(int)’: user.cpp:76:5: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:103:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( "map.out", "w", stdout ); ^ user.cpp: In constructor ‘input_reader::input_reader(const char*, const char*)’: user.cpp:28:45: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread( buffer, SIZE, 1, input_file ); ^ user.cpp: In member function ‘void input_reader::advance()’: user.cpp:20:49: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread( buffer, SIZE, 1, input_file ); ^