By default, a typedef name declared in the global scope has internal linkage. This means that separately compiled source files can’t refer to a typedef declared in another source file, unless that typedef is explicitly declared “extern.” In this respect, C++ is different from C, which make typedef names global by default. Thus, in C++ you are allowed to define the same typedef name in every separately compiled source file as long as the definitions are identical:
// file first.cpp typedef int I; // visible only in the scope of this file void func(I);// file second.cpp typedef int I; // visible only in the scope of this file float func2(I);
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