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How do i share data between different lambdas?


How do i share data between different lambdas?

By : Tom
Date : October 17 2020, 03:08 PM
I hope this helps . Amazon recommends using SSM Parameter Store to store variables (replacing environment variables) for Lambda (and other services). SSM Parameter Store supports encryption / descryption. Perfect for storing your DB credentials in one location that can be shared (within the same region).
Here are a couple of links to get you started:
code :


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Share variable between two lambdas

Share variable between two lambdas


By : Prateek Bansal
Date : March 29 2020, 07:55 AM
may help you . Unlike in some scripting languages, identifierCollection's lifetime won't be extended simply because you captured it into a closure. So as soon as you change that [=] for a [&] to capture by reference, it's a dangling reference to a local variable that you're capturing.
You'll have to manage the lifetime of identifierCollection yourself; frankly, this sounds like the perfect opportunity for a shared pointer, captured by value into each lambda. The dynamically-allocated map it wraps will literally exist for as long as you need it to.
code :
void holdAdd(const Rect& rectangle, Hold anonymousHeld, Hold anonymousFinish)
{
    auto identifierCollection = std::make_shared<std::map<int,bool>>();

    HoldFinish holdFinish = [=](const int& identifier) mutable {
        if (identifierCollection->count(identifier) == 0) return;

        identifierCollection->erase(identifier);
        anonymousFinish();
    };

    holdCollisionCollection.push_back([=](const int& identifier, const Vec2& point) mutable {
        if (rectangle.containsPoint(point)) {
            (*identifierCollection)[identifier] = true;
            anonymousHeld();
        } else {
            holdFinish(identifier);
        }
    });
    holdFinishCollection.push_back(holdFinish);
}
Why does returning lambdas between branches of ternary operator work for some lambdas?

Why does returning lambdas between branches of ternary operator work for some lambdas?


By : Du Edu
Date : March 29 2020, 07:55 AM
it should still fix some issue The first snippet compiles because both lambdas are implicitly convertible to int(*)(int), so the compiler can use that as the type of the ?: expression and thus to deduce the type of result.
If the capture list is non-empty (case 2) no such conversion to pointer-to-function exists (5.1.2/6 in N4141), so we end up with two unrelated types with no common implicit conversion target as the 2nd and 3rd operand of operator?: and thus the type of the ternary expression can no longer be deduced.
Do AWS Lambdas share some state between runs?

Do AWS Lambdas share some state between runs?


By : rhekn
Date : March 29 2020, 07:55 AM
Hope this helps As jarmod answered in the comments. Lambdas do share some state between runs.
Here there is an article on the topic.
Share object between two lambdas

Share object between two lambdas


By : user2640470
Date : March 29 2020, 07:55 AM
hope this fix your issue When you assign a new value to a std::shared_ptr - you create a new shared value, that doesn't have any connection with the previous one (you can have a look at counters of both shared_ptrs). You should change
code :
fileToLoad = make_shared<string>(files.first().toUtf8().constData());
*fileToLoad  = files.first().toUtf8().constData()
View Share doesn't return updated data, how then to share live data?

View Share doesn't return updated data, how then to share live data?


By : user2780371
Date : March 29 2020, 07:55 AM
help you fix your problem The session is not available in the boot method of the service providers. You should create a middleware for this. Check out this answer here: How to retrieve session data in service providers in laravel?
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