This Clause describes utilities that are generally useful in C++ programs; some of these utilities are used by other elements of the C++ standard library. These utilities are summarized in Table [tab:util.lib.summary].
| Subclause | Header(s) | |
| [utility] | Utility components | <utility> |
| [pairs] | Pairs | <utility> |
| [tuple] | Tuples | <tuple> |
| [template.bitset] | Fixed-size sequences of bits | <bitset> |
| <memory> | ||
| [memory] | Memory | <cstdlib> |
| <cstring> | ||
| [smartptr] | Smart pointers | <memory> |
| [function.objects] | Function objects | <functional> |
| [meta] | Type traits | <type_traits> |
| [ratio] | Compile-time rational arithmetic | <ratio> |
| [time] | Time utilities | <chrono> |
| <ctime> | ||
| [allocator.adaptor] | Scoped allocators | <scoped_allocator> |
| [type.index] | Type indexes | <typeindex> |