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Standard library header <spanstream> (C++23)

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Standard Library headers
Note: a slash '/' in a revision mark means that the header was deprecated and/or removed.
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<concepts> (C++20)
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<system_error> (C++11)

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<memory_resource> (C++17)  
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<bitset>

<charconv> (C++17)
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<cuchar> (C++11)

Containers
<flat_set> (C++23)
<span> (C++20)
<mdspan> (C++23)

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<iterator>
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<cfenv> (C++11)
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Time
<chrono> (C++11)
Localization
<codecvt> (C++11/17)
Input/output
<sstream>
<spanstream> (C++23)
<fstream>
<syncstream> (C++20)
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<cstdio>
<cinttypes> (C++11)
<strstream> (C++98/)
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<condition_variable> (C++11)  
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<barrier> (C++20)
<future> (C++11)

C compatibility
<cstdbool> (C++11/17/20)  
<ccomplex> (C++11/17/20)
<ctgmath> (C++11/17/20)

<cstdalign> (C++11/17/20)

<ciso646> (until C++20)

 

This header is part of the Input/Output library.

Contents

Classes

implements raw fixed character buffer device
(class template) [edit]
implements fixed character buffer input operations
(class template) [edit]
implements fixed character buffer output operations
(class template) [edit]
implements fixed character buffer input/output operations
(class template) [edit]
spanbuf (C++23) std::basic_spanbuf<char>
(typedef)
wspanbuf (C++23) std::basic_spanbuf<wchar_t>
(typedef)
ispanstream (C++23) std::basic_ispanstream<char>
(typedef)
wispanstream (C++23) std::basic_ispanstream<wchar_t>
(typedef)
ospanstream (C++23) std::basic_ospanstream<char>
(typedef)
wospanstream (C++23) std::basic_ospanstream<wchar_t>
(typedef)
spanstream (C++23) std::basic_spanstream<char>
(typedef)
wspanstream (C++23) std::basic_spanstream<wchar_t>
(typedef)

Functions

specializes the std::swap algorithm
(function template) [edit]
specializes the std::swap algorithm
(function template) [edit]
specializes the std::swap algorithm
(function template) [edit]
specializes the std::swap algorithm
(function template) [edit]

[edit] Synopsis

namespace std {
  template<class CharT, class Traits = char_traits<CharT>>
    class basic_spanbuf;
 
  using spanbuf = basic_spanbuf<char>;
  using wspanbuf = basic_spanbuf<wchar_t>;
 
  template<class CharT, class Traits = char_traits<CharT>>
    class basic_ispanstream;
 
  using ispanstream = basic_ispanstream<char>;
  using wispanstream = basic_ispanstream<wchar_t>;
 
  template<class CharT, class Traits = char_traits<CharT>>
    class basic_ospanstream;
 
  using ospanstream = basic_ospanstream<char>;
  using wospanstream = basic_ospanstream<wchar_t>;
 
  template<class CharT, class Traits = char_traits<CharT>>
    class basic_spanstream;
 
  using spanstream = basic_spanstream<char>;
  using wspanstream = basic_spanstream<wchar_t>;
}

[edit] Class template std::basic_spanbuf

namespace std {
  template<class CharT, class Traits = char_traits<CharT>>
  class basic_spanbuf
    : public basic_streambuf<CharT, Traits> {
  public:
    using char_type      = CharT;
    using int_type       = typename Traits::int_type;
    using pos_type       = typename Traits::pos_type;
    using off_type       = typename Traits::off_type;
    using traits_type    = Traits;
 
    // constructors
    basic_spanbuf() : basic_spanbuf(ios_base::in | ios_base::out) {}
    explicit basic_spanbuf(ios_base::openmode which)
      : basic_spanbuf(std::span<CharT>(), which) {}
    explicit basic_spanbuf(
      std::span<CharT> s,
      ios_base::openmode which = ios_base::in | ios_base::out);
    basic_spanbuf(const basic_spanbuf&) = delete;
    basic_spanbuf(basic_spanbuf&& rhs);
 
    // assign and swap
    basic_spanbuf& operator=(const basic_spanbuf&) = delete;
    basic_spanbuf& operator=(basic_spanbuf&& rhs);
    void swap(basic_spanbuf& rhs);
 
    // get and set
    std::span<CharT> span() const noexcept;
    void span(std::span<CharT> s) noexcept;
 
    protected:
    // overridden virtual functions
    basic_streambuf<CharT, Traits>* setbuf(CharT*, streamsize) override;
    pos_type seekoff(off_type off, ios_base::seekdir way,
                     ios_base::openmode which
                       = ios_base::in | ios_base::out) override;
    pos_type seekpos(pos_type sp,
                     ios_base::openmode which
                       = ios_base::in | ios_base::out) override;
 
  private:
    ios_base::openmode mode; // exposition only
    std::span<CharT> buf; // exposition only
  };
 
  template<class CharT, class Traits>
    void swap(basic_spanbuf<CharT, Traits>& x,
              basic_spanbuf<CharT, Traits>& y);
}

[edit] Class template std::basic_ispanstream

namespace std {
  template<class CharT, class Traits = char_traits<CharT>>
  class basic_ispanstream
    : public basic_istream<CharT, Traits> {
  public:
    using char_type      = CharT;
    using int_type       = typename Traits::int_type;
    using pos_type       = typename Traits::pos_type;
    using off_type       = typename Traits::off_type;
    using traits_type    = Traits;
 
    // constructors
    explicit basic_ispanstream(
      std::span<CharT> s,
      ios_base::openmode which = ios_base::in);
    basic_ispanstream(const basic_ispanstream&) = delete;
    basic_ispanstream(basic_ispanstream&& rhs);
    template<class ROS>
    explicit basic_ispanstream(ROS&& s);
 
    // assign and swap
    basic_ispanstream& operator=(const basic_ispanstream&) = delete;
    basic_ispanstream& operator=(basic_ispanstream&& rhs);
    void swap(basic_ispanstream& rhs);
 
    // members
    basic_spanbuf<CharT, Traits>* rdbuf() const noexcept;
    std::span<const CharT> span() const noexcept;
    void span(std::span<CharT> s) noexcept;
    template<class ROS>
    void span(ROS&& s) noexcept;
 
  private:
    basic_spanbuf<CharT, Traits> sb; // exposition only
  };
 
  template<class CharT, class Traits>
    void swap(basic_ispanstream<CharT, Traits>& x,
              basic_ispanstream<CharT, Traits>& y);
}

[edit] Class template std::basic_ospanstream

namespace std {
  template<class CharT, class Traits = char_traits<CharT>>
  class basic_ospanstream
    : public basic_ostream<CharT, Traits> {
  public:
    using char_type      = CharT;
    using int_type       = typename Traits::int_type;
    using pos_type       = typename Traits::pos_type;
    using off_type       = typename Traits::off_type;
    using traits_type    = Traits;
 
    // constructors
    explicit basic_ospanstream(
      std::span<CharT> s,
      ios_base::openmode which = ios_base::out);
    basic_ospanstream(const basic_ospanstream&) = delete;
    basic_ospanstream(basic_ospanstream&& rhs);
 
    // assign and swap
    basic_ospanstream& operator=(const basic_ospanstream&) = delete;
    basic_ospanstream& operator=(basic_ospanstream&& rhs);
    void swap(basic_ospanstream& rhs);
 
    // members
    basic_spanbuf<CharT, Traits>* rdbuf() const noexcept;
    std::span<CharT> span() const noexcept;
    void span(std::span<CharT> s) noexcept;
 
  private:
    basic_spanbuf<CharT, Traits> sb; // exposition only
  };
 
  template<class CharT, class Traits>
    void swap(basic_ospanstream<CharT, Traits>& x,
              basic_ospanstream<CharT, Traits>& y);
}

[edit] Class template std::basic_spanstream

namespace std {
  template<class CharT, class Traits = char_traits<CharT>>
  class basic_spanstream
    : public basic_iostream<CharT, Traits> {
  public:
    using char_type     = charT;
    using int_type      = typename Traits::int_type;
    using pos_type      = typename Traits::pos_type;
    using off_type      = typename Traits::off_type;
    using traits_type   = Traits;
 
    // constructors
    explicit basic_spanstream(
      std::span<CharT> s,
      ios_base::openmode which = ios_base::out | ios_base::in);
    basic_spanstream(const basic_spanstream&) = delete;
    basic_spanstream(basic_spanstream&& rhs);
 
    // assign and swap
    basic_spanstream& operator=(const basic_spanstream&) = delete;
    basic_spanstream& operator=(basic_spanstream&& rhs);
    void swap(basic_spanstream& rhs);
 
    // members
    basic_spanbuf<CharT, Traits>* rdbuf() const noexcept;
    std::span<CharT> span() const noexcept;
    void span(std::span<CharT> s) noexcept;
 
  private:
    basic_spanbuf<CharT, Traits> sb; // exposition only
  };
 
  template<class CharT, class Traits>
    void swap(basic_spanstream<CharT, Traits>& x,
              basic_spanstream<CharT, Traits>& y);
}