async_wait calls the callback function argument passed by way bind bind, lambda expressions can be used in place of
the original call to a print will fail, can be performed many times through the next print expires_at defined once the expiration time
required accounting for a parameter error_code is a system parameter
async_wait only one parameter is required bind binding function and function parameters
with higher lambda efficient way:
callback parameter bindings life cycle must be long enough to ensure that the run to run
wild pointer as following invokes the run since more than smart pointers a smart pointer of the life cycle, but this is not necessarily wrong C ++ dark side, even though the pointer has become a field guide but still retains the structure when the new
print can be found in what has been wrong with the vector container
