Boost C++ 库

一个buffered_handshake令牌是一个完成令牌，用于完成签名 void(error_code, size_t).

示例

作为buffered_handshake令牌的自由函数

void buffered_handshake_handler(
    const boost::system::error_code& ec,
    std::size_t bytes_transferred)
{
  ...
}

一个buffered_handshake令牌函数对象

struct buffered_handshake_handler
{
  ...
  void operator()(
      const boost::system::error_code& ec,
      std::size_t bytes_transferred)
  {
    ...
  }
  ...
};

一个lambda表达式作为buffered_handshake令牌

ssl_stream.async_handshake(...,
    [](const boost::system::error_code& ec,
      std::size_t bytes_transferred)
    {
      ...
    });

使用std::bind()适配到buffered_handshake令牌的非静态类成员函数

void my_class::buffered_handshake_handler(
    const boost::system::error_code& ec,
    std::size_t bytes_transferred)
{
  ...
}
...
ssl_stream.async_handshake(...,
    std::bind(&my_class::buffered_handshake_handler,
      this, std::placeholders::_1,
      std::placeholders::_2));

使用boost::bind()适配到buffered_handshake令牌的非静态类成员函数

void my_class::buffered_handshake_handler(
    const boost::system::error_code& ec,
    std::size_t bytes_transferred)
{
  ...
}
...
ssl_stream.async_handshake(...,
    boost::bind(&my_class::buffered_handshake_handler,
      this, boost::asio::placeholders::error,
      boost::asio::placeholders::bytes_transferred));

使用 use_future 作为缓冲握手令牌

std::future<std::size_t> f =
  ssl_stream.async_handshake(..., boost::asio::use_future);
...
try
{
  std::size_t n = f.get();
  ...
}
catch (const system_error& e)
{
  ...
}

使用 use_awaitable 作为缓冲握手令牌

boost::asio::awaitable<void> my_coroutine()
{
  try
  {
    ...
    std::size_t n =
      co_await ssl_stream.async_handshake(
          ..., boost::asio::use_awaitable);
    ...
  }
  catch (const system_error& e)
  {
    ...
  }
}