c – 虚函数的显式覆盖

从第一个链接：

override indicates that a member of a managed type must override a base class or a base interface member. If there is no member to override,the compiler will generate an error.

override is also valid when compiling for native targets (without /clr). See Override Specifiers and Native Compilations for more information.

override is a context-sensitive keyword. See Context-Sensitive Keywords for more information.

从C 11标准开始,覆盖说明符现在是标准化关键字.支持仍然有限,根据此page from Apache StdCxx,GCC 4.7,Intel C 12.0和Visual C 2012支持覆盖(在Visual C 2005中具有预标准化支持).