标准库头文件 <strstream> (在 C++98 中已弃用)(在 C++26 中已删除)
来自 cppreference.com
此头文件是 输入/输出 库的一部分。
类 | ||
(在 C++98 中已弃用)(在 C++26 中已删除) |
实现原始字符数组设备 (类) | |
(在 C++98 中已弃用)(在 C++26 中已删除) |
实现字符数组输入操作 (类) | |
(在 C++98 中已弃用)(在 C++26 中已删除) |
实现字符数组输出操作 (类) | |
(在 C++98 中已弃用)(在 C++26 中已删除) |
实现字符数组输入/输出操作 (类) |
[编辑] 注释
<strstream> 在 C++98 中已弃用,并在 C++26 中移除(参见 P2867R1)。
移除的原因是 C++20 和 C++23 提供了更优秀的替代方案,例如能够有效地将字符串从 std::stringstream 中移动出去(自 C++20 起,参见 P0408R7),以及 <spanstream> 库(自 C++23 起,参见 P0448R4)。
[编辑] 概要
namespace std { class strstreambuf; class istrstream; class ostrstream; class strstream; }
[编辑] 类 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] 类 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] 类 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] 类 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 }; }