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std::strstreambuf::setbuf

std：：strflow buf：：setbuf

protected: virtual streambuf* 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

pubsetbufinvokes setbuf() (public member function of std::basic_streambuf)
setbuf virtualreplaces the buffer with user-defined array, if permitted (virtual protected member function of std::basic_streambuf)
setbuf virtualattempts to replace the controlled character sequence with an array (virtual protected member function of std::basic_stringbuf)
setbuf virtualprovides user-supplied buffer or turns this filebuf unbuffered (virtual protected member function of std::basic_filebuf)

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