看了一下google CoverStory的代码，有一个地方很有意思：

　　// These are the various document types used by CoverStory.

　　// Included in both Obj-C and plist sources.

　　// A little magic to get CPP to turn things into cstrings for the code but have

　　// the strings raw for the plists. The reason we need this is if we just put

　　// them in quotes (cstrings) then we’d get those quotes in the plists, which we

　　// don’t want.

　　#define STRINGIFY(x) #x

　　#define TO_STRING(x) STRINGIFY(x)

　　#define kGCOVTypeNameRaw GNU Compiler Coverage File

　　#define kGCOVTypeName TO_STRING(kGCOVTypeNameRaw)

　　然后在使用的地方

　　NSLog(@kGCOVTypeName);

　　或者

　　std::cout<

　　就能把GNU Compiler Coverage File值输出来了，

　　但如果用NSLog(@#kGCOVTypeNameRaw);则不行。

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