c++ - error C2039: 'result_type' : is not a member of '`global namespace'' -

my app throwing error:

error c2039: 'result_type' : not member of '`global namespace'' 

for code:

void handle_read_headers(const boost::system::error_code& err, restclient::response& resp) {     if (!err)     {         // process response headers.         std::istream response_stream(&response_);         std::string header;         while (std::getline(response_stream, header) && header != "\r")             std::cout << header << "\n";         std::cout << "\n";          // write whatever content have output.         if (response_.size() > 0)             std::cout << &response_;          (&resp)->body = "yehey!!!";          // start reading remaining data until eof.         boost::asio::async_read(socket_, response_,         boost::asio::transfer_at_least(1),         boost::bind(&client::handle_read_content, this,         boost::asio::placeholders::error, boost::ref(resp)));      }     else     {         std::cout << "error: " << err << "\n";     } } 

the "bound" function looks this:

void handle_read_content(const boost::system::error_code& err, restclient::response& resp){} 

what wrong in code?

update:

i able compile code these changes

according documentation page readhandler needs take , error code as as number of bytes transferred.

it might msvc more picky/sensitive missing placeholders when invoking bind expression.¹

try adding placeholder parameter bind:

// start reading remaining data until eof. boost::asio::async_read(socket_, response_,         boost::asio::transfer_at_least(1),         boost::bind(&client::handle_read_content, this,             boost::asio::placeholders::error,             boost::asio::placeholders::bytes_transferred,             boost::ref(resp))); 

and handler function too:

void handle_read_content(const boost::system::error_code& ec, size_t bytes_transferred, restclient::response& resp){} 

update

i have spent unreasonable amounts of effort (thanks @qballer, @nab, , others on live feed too!) reproduce in visual studio , got this:

for record: was

• win32
• boost 1_58_0
• openssl-1.0.2c-i386-win32
• visual studio 2013 update 4

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¹ in fact i've noticed asio accepts different signatures handler functions using gcc (my preferred compiler). i've wondered whether feature, or perhaps bug?