CODEWITHSUNDEEP
c++arraysc++11unique-ptr
Kenneth Rapp
Kenneth Rapp

Reputation: 169

initialize an array of unique_ptrs

I'm trying to build an entity-component class which stores components in a vector of std::arrays of std::unique_ptrs of derived Component pointers, like so:

vector<pair<int, array<unique_ptr<Component>, 32>>> components;

When trying to create a new array for a new component, though, even using move(), I wind up getting the following error:

this->count++;
vector<pair<int, array<unique_ptr<Component>, 32>>> component_set;
this->components.emplace_back(make_pair(this->count, move(component_set)));

    Error   1   error C2248: 'std::unique_ptr<_Ty>::unique_ptr' : 
    cannot access private member declared in class 'std::unique_ptr<_Ty>'   
    c:\program files\microsoft visual studio 11.0\vc\include\array  211 1   
    entity

is this a problem with using the std::array class, or am I just doing this entirely wrong (which is possible?)

Upvotes: 0

Views: 834

Answers (1)

Dietmar K&#252;hl
Dietmar K&#252;hl

Reputation: 154045

It seems the use of emplace_back() jumps through a std::pair<...> where it really shouldn't. Try

this->componets.emplace_back(int, std::array<std::unique_ptr<Component>, 32>());

You actually try add something into component which seems to be of a type would contain an entity of the type of components.

Upvotes: 1

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