View Compilation Error

0_0_37293890_6778.cpp: In constructor 'Matrix::Matrix()':
0_0_37293890_6778.cpp:17:36: error: 'memset' was not declared in this scope
         memset(data, 0, sizeof data);
                                    ^
0_0_37293890_6778.cpp: In member function 'void Matrix::eye()':
0_0_37293890_6778.cpp:32:36: error: 'memset' was not declared in this scope
         memset(data, 0, sizeof data);
                                    ^