How can I create a shared_ptr to a std::vector?

Question

I need to create a shared_ptr to a std::vector, what is the correct syntax?

std::vector mVector;
shared_ptr> mSha         


        

Answer 1

First, what you're doing is very wrong, if you give a pointer to a shared_ptr make sure it's dynamically allocated with new, not on the stack. Otherwise you may just as well use a pointer instead of a shared_ptr.

Your code should be:

std::vector mVector;
/* Copy the vector in a shared pointer */
std::shared_ptr > mSharedPtr ( new std::vector(mVector) );

or:

std::shared_ptr > mSharedPtr ( new std::vector() );

As for why it doesn't compile, you need to use the constructor, not the = operator.

As pointed out by @remyabel, make_shared is more efficient:

std::vector vector;
/* Copy the vector in a shared pointer */
auto sharedPtr = std::make_shared> (vector);