c – boost :: asio :: streambuf收缩适合？

例如：以下代码首先创建了一个streambuf而没有指定max_size.
然后它将14Mb数据转储到streambuf中.
然后它消耗所有这14MB数据.
在点2000处,streambuf.size()为0,但“top”表示该过程仍需要14MB ram.

我不想指定max_size.
无论如何,在空白之后收缩streambuf？

#include <boost/asio.hpp>
#include <iostream>
#include <string>

int main()
{
    {
        boost::asio::streambuf b;
        std::ostream os(&b);

        for(int i= 0; i<1000000; ++i)
        {
            os << "Hello,World!n";
        }
        std::cout<<"point 1000"<<std::endl;
        std::cout<<"size="<<b.size()<<std::endl;
        // at this point,the streambuf's size is close to 14MB.


        b.consume(b.size());
        std::cout<<"point 2000"<<std::endl;
        std::cout<<"size="<<b.size()<<std::endl;
        // at this point,the streambuf.size() is 0
        // but the streambuf's underlying buffer,which is a vector I assume,// still hold that 14MB space.
        // "top" shows the process size is 14M


    }

    // at this point,"top" showed the process size shrinks to almost zero
    std::cout<<"point 4000"<<std::endl;
    return 0;
}