[iosfwd.syn]

# 31 Input/output library [[input.output]](./#input.output)

## 31.3 Forward declarations [[iostream.forward]](iostream.forward#iosfwd.syn)

### 31.3.1 Header <iosfwd> synopsis [iosfwd.syn]

[🔗](#header:%3ciosfwd%3e)

namespace std {template<class charT> struct char_traits; template<> struct char_traits<char>; template<> struct char_traits<char8_t>; template<> struct char_traits<char16_t>; template<> struct char_traits<char32_t>; template<> struct char_traits<wchar_t>; template<class T> class allocator; template<class charT, class traits = char_traits<charT>>class basic_ios; template<class charT, class traits = char_traits<charT>>class basic_streambuf; template<class charT, class traits = char_traits<charT>>class basic_istream; template<class charT, class traits = char_traits<charT>>class basic_ostream; template<class charT, class traits = char_traits<charT>>class basic_iostream; template<class charT, class traits = char_traits<charT>, class Allocator = allocator<charT>>class basic_stringbuf; template<class charT, class traits = char_traits<charT>, class Allocator = allocator<charT>>class basic_istringstream; template<class charT, class traits = char_traits<charT>, class Allocator = allocator<charT>>class basic_ostringstream; template<class charT, class traits = char_traits<charT>, class Allocator = allocator<charT>>class basic_stringstream; template<class charT, class traits = char_traits<charT>>class basic_spanbuf; template<class charT, class traits = char_traits<charT>>class basic_ispanstream; template<class charT, class traits = char_traits<charT>>class basic_ospanstream; template<class charT, class traits = char_traits<charT>>class basic_spanstream; template<class charT, class traits = char_traits<charT>>class basic_filebuf; template<class charT, class traits = char_traits<charT>>class basic_ifstream; template<class charT, class traits = char_traits<charT>>class basic_ofstream; template<class charT, class traits = char_traits<charT>>class basic_fstream; template<class charT, class traits = char_traits<charT>, class Allocator = allocator<charT>>class basic_syncbuf; template<class charT, class traits = char_traits<charT>, class Allocator = allocator<charT>>class basic_osyncstream; template<class charT, class traits = char_traits<charT>>class istreambuf_iterator; template<class charT, class traits = char_traits<charT>>class ostreambuf_iterator; using ios = basic_ios<char>; using wios = basic_ios<wchar_t>; using streambuf = basic_streambuf<char>; using istream = basic_istream<char>; using ostream = basic_ostream<char>; using iostream = basic_iostream<char>; using stringbuf = basic_stringbuf<char>; using istringstream = basic_istringstream<char>; using ostringstream = basic_ostringstream<char>; using stringstream = basic_stringstream<char>; using spanbuf = basic_spanbuf<char>; using ispanstream = basic_ispanstream<char>; using ospanstream = basic_ospanstream<char>; using spanstream = basic_spanstream<char>; using filebuf = basic_filebuf<char>; using ifstream = basic_ifstream<char>; using ofstream = basic_ofstream<char>; using fstream = basic_fstream<char>; using syncbuf = basic_syncbuf<char>; using osyncstream = basic_osyncstream<char>; using wstreambuf = basic_streambuf<wchar_t>; using wistream = basic_istream<wchar_t>; using wostream = basic_ostream<wchar_t>; using wiostream = basic_iostream<wchar_t>; using wstringbuf = basic_stringbuf<wchar_t>; using wistringstream = basic_istringstream<wchar_t>; using wostringstream = basic_ostringstream<wchar_t>; using wstringstream = basic_stringstream<wchar_t>; using wspanbuf = basic_spanbuf<wchar_t>; using wispanstream = basic_ispanstream<wchar_t>; using wospanstream = basic_ospanstream<wchar_t>; using wspanstream = basic_spanstream<wchar_t>; using wfilebuf = basic_filebuf<wchar_t>; using wifstream = basic_ifstream<wchar_t>; using wofstream = basic_ofstream<wchar_t>; using wfstream = basic_fstream<wchar_t>; using wsyncbuf = basic_syncbuf<wchar_t>; using wosyncstream = basic_osyncstream<wchar_t>; template<class state> class fpos; using streampos = fpos<char_traits<char>::state_type>; using wstreampos = fpos<char_traits<wchar_t>::state_type>; using u8streampos = fpos<char_traits<char8_t>::state_type>; using u16streampos = fpos<char_traits<char16_t>::state_type>; using u32streampos = fpos<char_traits<char32_t>::state_type>;}

[1](#1)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L323)

Default template arguments are described as appearing both in[<iosfwd>](#header:%3ciosfwd%3e "31.3.1 Header <iosfwd> synopsis [iosfwd.syn]") and in the synopsis of other headers
but it is well-formed to include both[<iosfwd>](#header:%3ciosfwd%3e "31.3.1 Header <iosfwd> synopsis [iosfwd.syn]") and one or more of the other headers[.](#1.sentence-1)[257](#footnote-257 "It is the implementation's responsibility to implement headers so that including <iosfwd> and other headers does not violate the rules about multiple occurrences of default arguments.")

[257)](#footnote-257)[257)](#footnoteref-257)

It is the implementation's
responsibility to implement headers so
that including [<iosfwd>](#header:%3ciosfwd%3e "31.3.1 Header <iosfwd> synopsis [iosfwd.syn]") and other headers does not violate the rules about
multiple occurrences of default arguments[.](#footnote-257.sentence-1)