boost :: asio :: buffer如何遍历字节

Question

I am trying to implement a function that takes a boost::const_buffer and iterates over its bytes in a loop. I saw that there is a buffers iterator, but it seems to be applicable for boost::asio::buffers_type. I didn't find any examples for simple traversal of a buffer.

So, is it the standard way to access the buffer via buffer_cast into a native type such as char* and then traverse it by traditional methods? Or is there any direct helper function to do this?

Answer 1

boost::asio::buffer_cast<>

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

namespace asio = boost::asio;

void test(asio::const_buffer const& buffer)
{
    auto first = asio::buffer_cast<const char*>(buffer);
    auto last = first + asio::buffer_size(buffer);

    std::copy(first, last, std::ostream_iterator<char>(std::cout));
    std::cout << std::endl;
}

int main()
{
    std::string s = "hello";

    test(asio::buffer(s));
}