Here is a list of all documented namespace members with links to the namespaces they belong to:

### - i -

- icase : std::regex_constants
- identity_element() : __gnu_cxx
- ifstream : std
- includes() : std
- index_sequence : std
- index_sequence_for : std
- inner_product() : std
- inplace_merge() : std
- inserter() : std
- internal() : std
- io_errc : std
- ios : std
- iostream : std
- iota() : std
- is_heap() : std
- is_heap_until() : std
- is_nothrow_swappable_v : std
- is_nothrow_swappable_with_v : std
- is_partitioned() : std
- is_permutation() : std
- is_sorted() : std
- is_sorted_until() : std
- is_swappable_v : std
- is_swappable_with_v : std
- isalnum() : std
- isalpha() : std
- isblank() : std
- iscntrl() : std
- isdigit() : std
- isgraph() : std
- islower() : std
- isprint() : std
- ispunct() : std
- isspace() : std
- istream : std
- istringstream : std
- isupper() : std
- isxdigit() : std
- iter_swap() : std