Difference between boost::shared_ptr and std::shared_ptr from the standard <memory> file

Question

我想知道boost::shared_ptr和标准<memory>文件中找到的std::shared_ptr之间是否存在任何差异。

Answer 1

std::shared_ptr is the C++0x form of tr1::shared_ptr , and boost's boost::shared_ptr should behave the same.

However, std::shared_ptr , in an implementation that conforms to C++0x standard, should/might have more convenience behavior on the shared_ptr class, as described in the following links:

• Differences between different flavours of shared_ptr

• http://en.wikipedia.org/wiki/C%2B%2B0x#General-purpose_smart_pointers

The shared_ptr is a reference-counted pointer that acts as much as possible like a regular C++ data pointer. The TR1 implementation lacked certain pointer features such as aliasing and pointer arithmetic, but the C++0x version will add these.

• November 2010 Working Draft of C++0x

Though from a quick cursory glance, I do not see operator+ and similar arithmetic operations on the shared_ptr type.