| Term | Definition |
| ios_base | Base class with type-independent members for the standard stream classes (class) |
| ios | Base class with type-dependent members for the standard stream classes (class) |
| istream | Input stream (class) |
| ostream | Output Stream (class) |
| iostream | Input/Output Stream (class) |
| ifstream | Input file stream class (class) |
| ofstream | Output file stream (class) |
| fstream | Input/output file stream class (class) |
| istringstream | Input string stream class (class) |
| ostringstream | Output string stream class (class) |
| stringstream | Input/output string stream class (class) |
| streambuf | Base buffer class for streams (class) |
| filebuf | File stream buffer (class) |
| stringbuf | String stream buffer (class) |