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标准库头文件 <strstream> (在 C++98 中已废弃)(在 C++26 中已移除)

来自 cppreference.cn
< cpp‎ | 头文件
 
 
标准库头文件
通用工具
<any> (C++17)
<bitset>
<bit> (C++20)
<charconv> (C++17)
<expected> (C++23)
<format> (C++20)
<functional>
<optional> (C++17)
<tuple> (C++11)
<typeindex> (C++11)
<utility>
<variant> (C++17)
容器
<array> (C++11)
<deque>
<flat_map> (C++23)
<flat_set> (C++23)
<forward_list> (C++11)
<hive> (C++26)
<inplace_vector> (C++26)   
<list>
<map>
<mdspan> (C++23)
<queue>
<set>
<span> (C++20)
<stack>
<unordered_map> (C++11)
<unordered_set> (C++11)
<vector>
迭代器
<iterator>
Ranges
<generator> (C++23)
<ranges> (C++20)
算法
<algorithm>
<numeric>
字符串
<cctype>
<cstring>
<cuchar> (C++11)
<cwchar>
<cwctype>
<string_view> (C++17)
<string>
文本处理
<clocale>
<codecvt> C++11/17/26*
<locale>
<regex> (C++11)
<text_encoding> (C++26)   
数值
<cfenv> (C++11)
<cmath>
<complex>
<linalg> (C++26)
<numbers> (C++20)
<random> (C++11)
<simd> (C++26)
<valarray>
时间
<chrono> (C++11)
<ctime>
C 兼容性
<ccomplex> C++11/17/20*
<ciso646> (直到 C++20)
<cstdalign> C++11/17/20*
<cstdbool> C++11/17/20*
<ctgmath> C++11/17/20*
输入/输出
<cinttypes> (C++11)
<cstdio>
<filesystem> (C++17)
<fstream>
<iomanip>
<iosfwd>
<iostream>
<ios>
<istream>
<ostream>
<print> (C++23)
<spanstream> (C++23)
<sstream>
<streambuf>
<strstream> C++98/26*
<syncstream> (C++20)
并发支持
<atomic> (C++11)
<barrier> (C++20)
<condition_variable> (C++11)
<future> (C++11)
<hazard_pointer> (C++26)
<latch> (C++20)
<mutex> (C++11)
<rcu> (C++26)
<semaphore> (C++20)
<shared_mutex> (C++14)
<stdatomic.h> (C++23)
<stop_token> (C++20)
<thread> (C++11)
执行支持
<execution> (C++17)



 

此头文件是输入/输出库的一部分。

目录

(在 C++98 中已废弃)(在 C++26 中已移除)
实现原始字符数组设备
(类) [编辑]
(在 C++98 中已废弃)(在 C++26 中已移除)
实现字符数组输入操作
(类) [编辑]
(在 C++98 中已废弃)(在 C++26 中已移除)
实现字符数组输出操作
(类) [编辑]
(在 C++98 中已废弃)(在 C++26 中已移除)
实现字符数组输入/输出操作
(类) [编辑]

[编辑] 注释

<strstream> 在 C++98 中已废弃,并在 C++26 中已移除(参见 P2867R1)。

移除的原因是 C++20 和 C++23 提供了更优越的替代功能,例如高效地从 std::stringstream 中移动字符串的能力(自 C++20 起,参见 P0408R7),以及 <spanstream> 库(自 C++23 起,参见 P0448R4)。

[编辑] 摘要

namespace std {
  class strstreambuf;
  class istrstream;
  class ostrstream;
  class strstream;
}

[编辑] std::strstreambuf

namespace std {
  class strstreambuf : public basic_streambuf<char> {
  public:
    strstreambuf() : strstreambuf(0) {}
    explicit strstreambuf(streamsize alsize_arg);
    strstreambuf(void* (*palloc_arg)(size_t), void (*pfree_arg)(void*));
    strstreambuf(char* gnext_arg, streamsize n, char* pbeg_arg = nullptr);
    strstreambuf(const char* gnext_arg, streamsize n);
 
    strstreambuf(signed char* gnext_arg, streamsize n,
                 signed char* pbeg_arg = nullptr);
    strstreambuf(const signed char* gnext_arg, streamsize n);
    strstreambuf(unsigned char* gnext_arg, streamsize n,
                 unsigned char* pbeg_arg = nullptr);
    strstreambuf(const unsigned char* gnext_arg, streamsize n);
 
    virtual ~strstreambuf();
 
    void  freeze(bool freezefl = true);
    char* str();
    int   pcount();
 
  protected:
    int_type overflow (int_type c = EOF) override;
    int_type pbackfail(int_type c = EOF) override;
    int_type underflow() 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;
    streambuf* setbuf(char* s, streamsize n) override;
 
  private:
    using strstate = /*bitmask type*/;  // exposition only
    static const strstate allocated;    // exposition only
    static const strstate constant;     // exposition only
    static const strstate dynamic;      // exposition only
    static const strstate frozen;       // exposition only
    strstate strmode;                   // exposition only
    streamsize alsize;                  // exposition only
    void* (*palloc)(size_t);            // exposition only
    void (*pfree)(void*);               // exposition only
  };
}

[编辑] std::istrstream

namespace std {
  class istrstream : public basic_istream<char> {
  public:
    explicit istrstream(const char* s);
    explicit istrstream(char* s);
    istrstream(const char* s, streamsize n);
    istrstream(char* s, streamsize n);
    virtual ~istrstream();
 
    strstreambuf* rdbuf() const;
    char* str();
  private:
    strstreambuf sb;            // exposition only
  };
}

[编辑] std::ostrstream

namespace std {
  class ostrstream : public basic_ostream<char> {
  public:
    ostrstream();
    ostrstream(char* s, int n, ios_base::openmode mode = ios_base::out);
    virtual ~ostrstream();
 
    strstreambuf* rdbuf() const;
    void freeze(bool freezefl = true);
    char* str();
    int pcount() const;
  private:
    strstreambuf sb;            // exposition only
  };
}

[编辑] std::strstream

namespace std {
  class strstream
    : public basic_iostream<char> {
  public:
    // types
    using char_type = char;
    using int_type  = char_traits<char>::int_type;
    using pos_type  = char_traits<char>::pos_type;
    using off_type  = char_traits<char>::off_type;
 
    // constructors/destructor
    strstream();
    strstream(char* s, int n,
              ios_base::openmode mode = ios_base::in | ios_base::out);
    virtual ~strstream();
 
    // members
    strstreambuf* rdbuf() const;
    void freeze(bool freezefl = true);
    int pcount() const;
    char* str();
 
  private:
    strstreambuf sb;            // exposition only
  };
}