[Question] Difference between scoped scope and shared scope.

boost-ext / di

C++14 Dependency Injection Library

https://boost-ext.github.io/di

1.13k stars 137 forks source link

[Question] Difference between scoped scope and shared scope. #475

Closed FranckRJ closed 4 years ago

FranckRJ commented 4 years ago

Hello, I've tried to find more information about scoped scope and shared scope but I don't understand what's the difference between the two (didn't find any doc about it, and I don't understand the difference by reading the examples).

By reading the source code it looks like shared scope can be thread safe, and it provide a config to make it the default scope for an injector, but beside that i don't know.

Can you help me ? Thanks !

krzysztof-jusiak commented 4 years ago

Hi @FranckRJ,

There is no that much difference between them

Both of them are extensions and might be used instead of a default singleton scope to couple the lifetime of objects to the injector
Both of them will be much slower than the default singleton scope
shared scope is thread safe by default whilst scoped is not at all
shared scope can also be defaulted instead of singleton scope via shared_config

Thanks, Kris

FranckRJ commented 4 years ago

Ok, i see better now, thanks !