标准库标头 <strstream> (C++98 弃用)(C++26 移除)
来自cppreference.com
此头文件是输入/输出库的一部分。
类 | |
(C++98 弃用)(C++26 移除) |
实现原生字符数组设备 (类) |
(C++98 弃用)(C++26 移除) |
实现字符数组输入操作 (类) |
(C++98 弃用)(C++26 移除) |
实现字符数组输出操作 (类) |
(C++98 弃用)(C++26 移除) |
实现字符数组输入/输出操作 (类) |
注解
<strstream> 于 C++98 中弃用并于 C++26 中移除（见 P2867R1）。
移除它的理由是 C++20 和 C++23 已提供了更好的替代设施，比如从 std::basic_stringstream 中高效移出字符串的能力（C++20 起提供，见 P0408R7），以及 <spanstream> 库（C++23 起提供，见 P0448R4）。
概要
namespace std {
class strstreambuf;
class istrstream;
class ostrstream;
class strstream;
}
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 = /*位掩码类型*/; // 仅用于阐释
static const strstate allocated; // 仅用于阐释
static const strstate constant; // 仅用于阐释
static const strstate dynamic; // 仅用于阐释
static const strstate frozen; // 仅用于阐释
strstate strmode; // 仅用于阐释
streamsize alsize; // 仅用于阐释
void* (*palloc)(size_t); // 仅用于阐释
void (*pfree)(void*); // 仅用于阐释
};
}
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; // 仅用于阐释
};
}
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; // 仅用于阐释
};
}
类 std::strstream
namespace std {
class strstream
: public basic_iostream<char> {
public:
// 类型
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;
// 构造函数/析构函数
strstream();
strstream(char* s, int n,
ios_base::openmode mode = ios_base::in | ios_base::out);
virtual ~strstream();
// 成员
strstreambuf* rdbuf() const;
void freeze(bool freezefl = true);
int pcount() const;
char* str();
private:
strstreambuf sb; // 仅用于阐释
};
}