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{{cpp/header/title|iosfwd}}
{{cpp/header/navbar}}
This header contains forward declarations for the [[cpp/io|Input/output]] library.

{{dsc begin}}
{{dsc h1|Forward declarations}}
{{dsc header|string}}
{{dsc| {{lc|std::char_traits}} | Class Template which describes properties of a character type {{mark tclass}} }}
{{dsc| {{c|std::char_traits<char>}} | {{mark ptclass}} }}
{{dsc| {{c|std::char_traits<wchar_t>}} | {{mark ptclass}} }}
{{dsc| {{c|std::char_traits<char8_t>}} {{mark c++20}} | {{mark ptclass}} }}
{{dsc| {{c|std::char_traits<char16_t>}} {{mark c++11}} | {{mark ptclass}} }}
{{dsc| {{c|std::char_traits<char32_t>}} {{mark c++11}} | {{mark ptclass}} }}

{{dsc header | memory}}
{{dsc inc | cpp/memory/dsc allocator}}

{{dsc header | ios}}
{{dsc inc | cpp/io/dsc basic_ios}}
{{dsc inc | cpp/io/dsc fpos}}

{{dsc header | streambuf}}
{{dsc inc | cpp/io/dsc basic_streambuf}}

{{dsc header | ostream}}
{{dsc inc | cpp/io/dsc basic_ostream}}

{{dsc header | istream}}
{{dsc inc | cpp/io/dsc basic_istream}}
{{dsc inc | cpp/io/dsc basic_iostream}}

{{dsc header | fstream}}
{{dsc inc | cpp/io/dsc basic_filebuf}}
{{dsc inc | cpp/io/dsc basic_ifstream}}
{{dsc inc | cpp/io/dsc basic_ofstream}}
{{dsc inc | cpp/io/dsc basic_fstream}}

{{dsc header | sstream}}
{{dsc inc | cpp/io/dsc basic_stringbuf}}
{{dsc inc | cpp/io/dsc basic_istringstream}}
{{dsc inc | cpp/io/dsc basic_ostringstream}}
{{dsc inc | cpp/io/dsc basic_stringstream}}

{{dsc header | syncstream}}
{{dsc inc | cpp/io/dsc basic_syncbuf}}
{{dsc inc | cpp/io/dsc basic_osyncstream}}

{{dsc header | spanstream}}
{{dsc inc | cpp/io/dsc basic_spanbuf}}
{{dsc inc | cpp/io/dsc basic_ispanstream}}
{{dsc inc | cpp/io/dsc basic_ospanstream}}
{{dsc inc | cpp/io/dsc basic_spanstream}}

{{dsc header | strstream}}
{{dsc inc | cpp/io/dsc strstreambuf}}
{{dsc inc | cpp/io/dsc istrstream}}
{{dsc inc | cpp/io/dsc ostrstream}}
{{dsc inc | cpp/io/dsc strstream}}

{{dsc h1|Typedefs and specializations}}
{{dsc | {{lc|std::streampos}} | {{c|std::fpos<std::char_traits<char>::state_type>}}}}
{{dsc | {{lc|std::wstreampos}} | {{c|std::fpos<std::char_traits<wchar_t>::state_type>}}}}
{{dsc | {{lc|std::u8streampos}} | {{c|std::fpos<std::char_traits<char8_t>::state_type>}}}}
{{dsc | {{lc|std::u16streampos}} | {{c|std::fpos<std::char_traits<char16_t>::state_type>}}}}
{{dsc | {{lc|std::u32streampos}} | {{c|std::fpos<std::char_traits<char32_t>::state_type>}}}}
{{dsc | In addition, for each class template {{tt|std::basic_''T''}} declared in this header, {{tt|std::''T''}} and {{tt|std::w''T''}} are declared as a synonym of {{tt|std::basic_''T''<char>}} and {{tt|std::basic_''T''<wchar_t>}} respectively.}}<!--It will be a rather long list if all of them are shown, see http://en.cppreference.com/w/?oldid=72068 and the header synopsis below-->
{{dsc end}}

===Synopsis===
{{cpp/synopsis/iosfwd}}

{{langlinks|es|ja|zh}}

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