Different injectors create same singleton shared_ptr

[Warchant]

Expected Behavior

Different injectors should create different singletons (std::shared_ptr).

Actual Behavior

Different injectors create same singleton (std::shared_ptr).

Steps to Reproduce the Problem

https://godbolt.org/z/qVF9TI

In this example, Impl should have been created 2 times, because we use 2 different injectors.

Specifications

• Version: 4767207694ceba58b7655805193249d54e3bf405
• Platform: Mac

[Warchant]

@krzysztof-jusiak

[krzysztof-jusiak]

Thanks, @Warchant for your bug report and the example :+1:

By default (due to performance reasons) a singleton (global per app scope) is used.

In order to get shared per injector scope a shared scope has to be used:

        boost::di::bind<Interface>.to<Impl>().in(boost::di::extension::shared) // shared per injector

Full example here -> https://wandbox.org/permlink/4D4GXnqyPGijJb5X

More information might be found:

• https://boost-experimental.github.io/di/user_guide/index.html#scopes
• Tutorial - [Basic] Decide the life times
• https://boost-experimental.github.io/di/extensions/index.html#shared-scope

Please also notice that you can also change the default behaviour (for shared scope to be a default one) by

    auto injector = di::make_injector<di::extension::shared_config>(...);

Example here -> https://wandbox.org/permlink/4D4GXnqyPGijJb5X

I hope that makes sense.