我应该使用 boost::ptr_vector<T>或向量<boost::shared_ptr<T>>? [英] Should I use boost::ptr_vector<T> or vector<boost::shared_ptr<T> >?

问题描述

I need a container of pointers. Would you recommend boost::ptr_vector<T> or std::vector<boost::shared_ptr<T> >? (Or something else?)

If that's of interest, my actual data structure is relatively complicated (see here) and currently stores objects, not pointers, but i'd like to change that (using pointer containers), in order to get rid of unnecessary copying:

typedef std::multimap<Foo0, std::map<int, double> > VecElem;
std::vector<VecElem> vec;

解决方案

Who owns the object? If the container owns the objects (meaning the objects should not live longer than the container), use a ptr_vector. Otherwise, use a vector of shared_ptrs. Standard library containers (such as std::vector or std::list) own the objects they contain, so the semantics of a ptr_vector is closer to that.

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