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o I need to set somehow create_engine put in singleton to be like singleton?


o I need to set somehow create_engine put in singleton to be like singleton?

By : Sebastian Derryl
Date : November 25 2020, 01:01 AM
should help you out You probably want to use scoped_session which essentially serves as a thread-local singleton, creating sessions on-demand using the provided factory function.
In one module imported by all others you write:
code :


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In what cases, a singleton design pattern may generate multiple instances of the same singleton class?

In what cases, a singleton design pattern may generate multiple instances of the same singleton class?


By : PiGeoN
Date : March 29 2020, 07:55 AM
it helps some times In C++11 there is a new facility to make once-only initialization reliable - std::call_once. You can find a good reference for it here. If you're working with a compiler that supports C++11, this gives you a nice platform-independent, standard way of accomplishing it.
At the platform dependent level, most operating systems provide a means of doing once-only initialization. E.g. in iOS or OS X you can use dispatch_once from Grand Central Dispatch. On Windows, there's a One-Time Initialization API available in Vista and later.
Does calling GetInstance on a Singleton lifetime mapping return the singleton or create a new instance?

Does calling GetInstance on a Singleton lifetime mapping return the singleton or create a new instance?


By : ProForbes
Date : March 29 2020, 07:55 AM
will help you So I tried this and found that each time I called GetInstance with ExplicitArguments, a new unique object was created. But each time I called GetInstance without any arguments, the singleton reference was returned.
Would an inner static runnable in a singleton block if used as wrapper for callables, if it modifies a singleton's stati

Would an inner static runnable in a singleton block if used as wrapper for callables, if it modifies a singleton's stati


By : Mike Malone
Date : March 29 2020, 07:55 AM
it helps some times ConcurrentHashMap is designed to be non-blocking, although some contention is possible if multiple updates to the same hash segment happened simultaneously. Yes.
Implementing a singleton wrapper class that also verifies 'the singleton constructor is private'

Implementing a singleton wrapper class that also verifies 'the singleton constructor is private'


By : user3133795
Date : March 29 2020, 07:55 AM
Any of those help You can simplify the code as following and also get the error printed when the constructor is public (i.e. not private, protected)
code :
template<typename T>
class singleton
{
public:
    // Below constructor is always invoked, because the wannabe singleton class will derive this class
    singleton () {
        static_assert(!std::is_constructible<T>::value, "the constructor is public");
    }

    static T& instance();
};
class A : public singleton<A> 
{
  friend class singleton<A>;   
//public:  // <---------- make it `public` & you get the error!
  A() {}
};
is modifying singleton class codes the only way to extend the functionality of the singleton when using enum version sin

is modifying singleton class codes the only way to extend the functionality of the singleton when using enum version sin


By : joe
Date : March 29 2020, 07:55 AM
I wish did fix the issue. When the quote says the "sole instance should be extensible by subclassing", they are talking about situations where:
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