宏使用之 Macro Pitfalls

转载自：

https://developer.apple.com/legacy/library/documentation/DeveloperTools/gcc-4.0.1/cpp/Macro-Pitfalls.html#Macro-Pitfalls

3.10 Macro Pitfalls

In this section we describe some special rules that apply to macros and macro expansion, and point out certain cases in which the rules have counter-intuitive consequences that you must watch out for.

• Misnesting
• Operator Precedence Problems
• Swallowing the Semicolon
• Duplication of Side Effects
• Self-Referential Macros
• Argument Prescan
• Newlines in Arguments