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std::basic_streambuf::setbuf

性病：基本[医]Streambuf：：pubsetbuf，std：：basic[医]流f：：setbuf

basic_streambuf* pubsetbuf( char_type* s, std::streamsize n )(1)​
protected: virtual basic_streambuf<CharT, Traits>* setbuf( char_type* s, std::streamsize n )(2)​

1%29次电话setbuf(s, n)最派生的类

2%29此函数的基类版本没有任何影响。派生类可以重写此函数，以允许用用户提供的数组删除或替换受控字符序列%28(缓冲区%29)，或用于任何其他特定于实现的目的。

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

1%29setbuf(s, n)

2%29this

例

提供10K的阅读缓冲区。在Linux上，可以使用strace实用程序来观察实际读取的字节数。

二次

#include <fstream>
#include <iostream>
#include <string>
 
int main()
{
    int cnt = 0;
    std::ifstream file;
    char buf[10241];
 
    file.rdbuf()->pubsetbuf(buf, sizeof buf
 
    file.open("/usr/share/dict/words"
 
    for (std::string line; getline(file, line) {
        cnt++;
    }
 
    std::cout << cnt << '\n';
}

二次

另见

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)
setbuf virtualattempts to replace the controlled character sequence with an array (virtual protected member function of std::strstreambuf)
setbufsets the buffer for a file stream (function)

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