Utilities

Comparison

Three-way comparison support: std::strong_ordering, weak_ordering, partial_ordering, and comparison concepts (since C++20).

Formatting library (since C++20)

Function objects

Program support utilities

ranges

Range-based utility adaptors (since C++20).

rel_ops

Relational operator utilities in std::rel_ops — deprecated in C++20 in favour of operator<=>.

std::any

std::basic_stacktrace

std::bitset

std::expected

std::hash

std::initializer_list

std::optional

std::pair

std::source_location

std::stacktrace_entry

std::tuple

std::variant

Variadic functions