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A wait handler must meet the requirements for a handler.
A value h of a wait handler class should work correctly in the
expression h(ec), where ec is an lvalue of type
const error_code.
A free function as a wait handler:
void wait_handler(
const asio::error_code& ec)
{
...
}
A wait handler function object:
struct wait_handler
{
...
void operator()(
const asio::error_code& ec)
{
...
}
...
};
A lambda as a wait handler:
socket.async_wait(...,
[](const asio::error_code& ec)
{
...
});
A non-static class member function adapted to a wait handler using std::bind():
void my_class::wait_handler(
const asio::error_code& ec)
{
...
}
...
socket.async_wait(...,
std::bind(&my_class::wait_handler,
this, std::placeholders::_1));
A non-static class member function adapted to a wait handler using boost::bind():
void my_class::wait_handler(
const asio::error_code& ec)
{
...
}
...
socket.async_wait(...,
boost::bind(&my_class::wait_handler,
this, asio::placeholders::error));