作者: 谢瑞阳 10225101483 徐翔宇 10225101535
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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.