toys | Tools , scripts , toys , and utilities for Machine Box | Script Programming library

Define dependencies(The random generator here) as local variables are not recommended, it's much harder to do dependencies injection(Or it won't be possible), so I change the functions Rng_t into template function and pass the Rng as a parameter.

In practice to construct a random generation may be heavy work, it needs to initialize its internal status, to construct it every time we call the function flipCoin is waste.

The non-virtual function can be mocked, one most commonly used strategy is to use the template, here we make the class CoinFlipper's member function as a template function, then we can test the dependency with our MockRng.

Be aware that for the template function, we need to define the member function in the header file.

coinflipper.h:

Here is a working solution. We need to specify two lines to "group" together.

1. You can put a variable like this in your Headernav.php file and have it defined before your include

< title> < ?php echo "$my_title"; ?>

1. This variable can be changed by the way you get it

• from your url ($_GET)
• from a sql query
• from a session variable
• ...

In my approach, first you need to split the string to separate words, and then check whether it starts with @ or not. If the answer is true, then we can add a link instead of that word, as below:

Since it appears you already configured some rudimentary relationship that allowed the usage of join conditions, the next step is simply to actually use the Query.join() call.

My example below uses SQLAlchemy directly, so you may need to adapt the references to those specific to Flask-SQLALchemy (e.g. instead of creating a session you may instead use db.session, which I referenced from the Quickstart; also the Child and Toy classes I used inherit from a common sqlalchemy.ext.declarative.declarative_base() for the same reason, otherwise the same principles introduced below should be commonly applicable).

First, import and set up the classes - to keep this generalized, I will be using sqlalchemy directly as noted:

In your Toy class you are using @EqualsAndHashCode which will be resolved in an hashCode() implementation calculating the hashCode based on all properties of that class.

That means that the hashCode method in your Toy class invokes the hasCode method on Cat. In cat there is a Set of CatFoods which is mapped by Cat which means that to calculate the hashCode of catFoods the Cat property is involved. To calculate the hashCode of Cat it begins again calculating the hashCode of the Set of CatFoods

(Sounds confusing but currently I am unable to describe it better)

As there is no session active the Lazy collection can not be fetched which is required to calculate the hashCod. Thats why you get this exception.

Takeaway: explicitly exclude LAZY fetched properties from @EqualsAndHashCode calculation. You can annotate these properties using @EqualsAndHashCode.Exclude to exclude them from the hashCode calculation.

To see implementation of the hashCode calculation you can use the DeLombok functionality of IntelliJ.

You cannot to build this nested expected nested json document by row_to_json function. But it is not too hard:

In the data add a new array toyCollection :

The problem is when I start the program, two threads take objects at the same time, which is not good. I really don't know where is the mistake..

1. One problem is that you while tests should be a || not an &&. You want to sleep until both of the resources that you need are available.

2. You initialize the food to the true which I don't think you meant to do.

Running this a few number of iterations makes it seem like the algorithm is not fair and one thread always gets the resources or it alternates but this is only due to race conditions. If you change the enjoy sleep to (let's say) 1ms, and run this 100000s of times you should see all 3 threads get similar number of resource "enjoyment".