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std::basic_stringbuf::setbuf

性病：基本[医]：：setbuf

protected: virtual std::basic_streambuf* setbuf( char_type* 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，而一些实现清除std::string成员当前用作缓冲区，并开始使用用户提供的大小字符数组。n，其第一个元素被s，作为缓冲区和输入/输出字符序列。

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::basic_stringbuf...

参数

s-pointer to the first byte in the user-provided buffer or null
n-the number of bytes in the user-provided buffer or zero

返回值

this...

注记

不推荐的流缓冲区std::strstreambuf或者提振。IOStreams装置boost::basic_array可用于以可移植方式实现对用户提供的char数组的I/O缓冲。

例

测试字符串流%27s setbuf功能。

二次

#include <iostream>
#include <sstream>
 
int main()
{
    std::ostringstream ss;
    char c[1024] = {};
    ss.rdbuf()->pubsetbuf(c, 1024
    ss << 3.14 << '\n';
    std::cout << c << '\n';
}

二次

产出：

二次

3.14 (on GNU g++/libstdc++ and SunPro C++/roguewave)
<nothing> (on MS Visual Studio 2010, SunPro C++/stlport4, CLang++/libc++)

二次

另见

pubsetbufinvokes setbuf() (public member function of std::basic_streambuf)

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