std::strstreambuf::setbuf
protected: virtual streambuf<char>* setbuf(char* s, std::streamsize n); | ? | ? |
|---|
如果s为空指针，并且n为零，此函数不起任何作用。
否则，效果就是实现定义的：一些实现什么也不做，而一些实现释放用作缓冲区的动态成员数组，并开始使用用户提供的大小的字符数组。n，其第一个元素被s...
此函数是受保护的虚拟函数，只能通过pubsetbuf()派生的用户定义类的成员函数。std::strstreambuf...
参数
s | - | pointer to the first byte in the user-provided buffer |
|---|---|---|
n | - | the number of bytes in the user-provided buffer |
返回值
this...
例
实现测试，以检查在Sun Studio%29获得的动态strstream%28输出中是否支持setbuf%28%29。
二次
#include <strstream>
#include <iostream>
int main()
{
char a[100] = {};
std::strstream str;
str.rdbuf()->pubsetbuf(a, sizeof a);
str << "Test string" << std::ends;
std::cout << "user-provided buffer holds '" << a << "'\n";
}二次
可能的产出：
二次
user-provided buffer holds 'Test string'二次
另见
pubsetbuf | invokes setbuf() (public member function of std::basic_streambuf) |
|---|---|
setbuf virtual | replaces the buffer with user-defined array, if permitted (virtual protected member function of std::basic_streambuf) |
setbuf virtual | attempts to replace the controlled character sequence with an array (virtual protected member function of std::basic_stringbuf) |
setbuf virtual | provides user-supplied buffer or turns this filebuf unbuffered (virtual protected member function of std::basic_filebuf) |
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