#pragma once
Specifies that the file, in which the pragma resides, will be included (opened) only once by the compiler in a build. 至于#if _MSC_VER > 1000应该很明显吧。
Specifies that the file, in which the pragma resides, will be included (opened) only once by the compiler in a build. 至于#if _MSC_VER > 1000应该很明显吧。
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