Alternate to Initializing a vector of unique pointers

Question

I'm in need of a way to take a ´std::unique_ptr´ returned from a function and use that in an initialization list to initialize a std::vector of them. I am willing to settle for any solution that involves initializing the std::vector with a comma separated list (ie. variadic function returning the vector) but this process needs to use move semantics to take the returned ´std::unique_ptr´ data. The issue I am having can be seen in the code below:

#include <vector>
#include <memory>

std::unique_ptr<int> create(int value) {
    return std::make_unique<int>(value);
}

int main() {
    std::vector<std::unique_ptr<int>> myVec = { create(1), create(2), create(3) }; //this results in an error
    return 0;
}

Error Info: C2280 'std::unique_ptr>::unique_ptr(const std::unique_ptr<_Ty,std::default_delete<_Ty>> &)': attempting to reference a deleted function c:\program files (x86)\microsoft visual studio 14.0\vc\include\xmemory0 737

I am using microsoft visual studios 2015 to compile the program.

Edit: as I said before I need some solution that involves simply a comma separated list of unique pointers, I can't seem to figure out how to variadic arguments that tell me the # of arguments like std::initializer_list can do. Is there some template or macro hack I can use to achieve this?

Not sure why people keep calling it "visual studios" or why you have such an interesting indentation style, but that's by the by ;) — Lightness Races in Orbit, Mar 06 '17 at 16:42
related: http://stackoverflow.com/questions/8468774/can-i-list-initialize-a-vector-of-move-only-type — NathanOliver, Mar 06 '17 at 16:44

score 4 · Answer 1 · answered Mar 06 '17 at 16:42

4

You can't move elements out of a std::initializer_list.

answered Mar 06 '17 at 16:42

Simple

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5

Which is terrible. – Lightness Races in Orbit Mar 06 '17 at 16:43

Alternate to Initializing a vector of unique pointers

1 Answers1