Queuer | Queuer is a queue manager , built on top of OperationQueue | iOS library
kandi X-RAY | Queuer Summary
kandi X-RAY | Queuer Summary
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QUESTION
- Im trying to display a record with a where clause
It has an error "Trying to get property 'num_rows' of non-object"
...
ANSWER
Answered 2020-May-05 at 18:22Check if $conn
in the connect.php is connecting fine.
Try testing the query in a mysql client.
Use include("connect.php")
instead of require_once "connect.php"
.
QUESTION
I'm trying to implement a certain kind of object composition in C++. The idea is to create a set of all data structures which can be created by composing abstract classes that only know basic data structure operations. For example, a stack would be created by composing a pusher with a popper, a queue would be created by composing a queuer with a popper, etc.
The trouble is, even though Pusher, Popper and Queuer only serve as abstract classes, and as such are never meant to be instantiated, they have to know about how the data structure internally stores the data.
The goal is to have agnostic abstract classes that are only there to pass down method definitions to the concrete data structure classes, in the following fashion:
...ANSWER
Answered 2020-Jan-29 at 18:12even though Pusher and Popper don't know of elements, Stack does, and that's all that's important.
No. It’s not all that’s important as C++ is concerned, as you can clearly see — and with good reason. What you’re suggesting has numerous drawbacks and is thus not permitted. However, there are several ways to work around this limitation.
One way is to use virtual inheritance, and to define an abstract base class (called, e.g. Store
) that provides access to the storage that both Pusher
and Popper
operate on via a virtual function that is implemented in Stack
.
However, this approach also has numerous problems and is generally avoided in C++. A more idiomatic approach uses the Curiously recurring template pattern (CRTP).
Change your Pusher
and Popper
to class templates which take the Stack
class as template argument:
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