The escape mechanism provided in C++ is the alternate linkage specification, which was produced in the language by overloading the extern keyword. The extern is followed by a string that specifies the linkage you want for the declaration, followed by the declaration:
extern "C" float f(int a, char b);
This tells the compiler to give C linkage to f( ) so that the compiler doesn’t decorate the name. The only two types of linkage specifications supported by the standard are “C” and “C++,” but compiler vendors have the option of supporting other languages in the same way.
原文链接: https://www.cnblogs.com/zhtf2014/archive/2010/11/20/1882619.html
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