小组成员:姚凯文(kevinyao0901),姜嘉琪
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This directory contains interfaces and implementations that isolate the rest of the package from platform details.

Code in the rest of the package includes "port.h" from this directory. "port.h" in turn includes a platform specific "port_.h" file that provides the platform specific implementation.

See port_stdcxx.h for an example of what must be provided in a platform specific header file.