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标准库头文件 <spanstream> (C++23)

来自 cppreference.com
< cpp‎ | header
 
 
标准库头文件
语言支持
概念
<concepts> (C++20)
诊断
<system_error> (C++11)

内存管理
<memory_resource> (C++17)  
元编程
<type_traits> (C++11)
<ratio> (C++11)
通用实用程序
<utility>
<tuple> (C++11)
<optional> (C++17)
<variant> (C++17)
<any> (C++17)
<debugging> (C++26)
<expected> (C++23)
<bitset>
<charconv> (C++17)
<format> (C++20)
<bit> (C++20)

字符串
<cuchar> (C++11)

容器
<flat_set> (C++23)
<span> (C++20)
<mdspan> (C++23)
<inplace_vector> (C++26)
迭代器
<iterator>
范围
<ranges> (C++20)
<generator> (C++23)
算法
数值
<cfenv> (C++11)
<complex>
<cmath>
<linalg> (C++26)
<numbers> (C++20)

时间
<chrono> (C++11)
本地化
<codecvt> (C++11/17/26*)
<text_encoding> (C++26)
输入/输出
<sstream>
<spanstream> (C++23)
<fstream>
<syncstream> (C++20)
<filesystem> (C++17)
<cstdio>
<cinttypes> (C++11)
<strstream> (C++98/26*)
正则表达式
<regex> (C++11)
并发支持
<stop_token> (C++20)
<thread> (C++11)
<atomic> (C++11)
<rcu> (C++26)
<stdatomic.h> (C++23)
<mutex> (C++11)
<shared_mutex> (C++14)

<condition_variable> (C++11)  
<semaphore> (C++20)
<latch> (C++20)

<barrier> (C++20)
<future> (C++11)
<hazard_pointer> (C++26)

C 兼容性
<cstdbool> (C++11/17/20*)  
<ccomplex> (C++11/17/20*)
<ctgmath> (C++11/17/20*)

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

<ciso646> (直到 C++20)

 

此头文件是 输入/输出 库的一部分。

内容

实现原始固定字符缓冲区设备
(类模板) [编辑]
实现固定字符缓冲区输入操作
(类模板) [编辑]
实现固定字符缓冲区输出操作
(类模板) [编辑]
实现固定字符缓冲区输入/输出操作
(类模板) [编辑]
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)

函数

专门化了 std::swap 算法
(函数模板) [编辑]
专门化了 std::swap 算法
(函数模板) [编辑]
专门化了 std::swap 算法
(函数模板) [编辑]
专门化了 std::swap 算法
(函数模板) [编辑]

[编辑] 概述

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>;
}

[编辑] 类模板 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);
}

[编辑] 类模板 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);
}

[编辑] 类模板 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);
}

[编辑] 类模板 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);
}