摘要： 1. 宏可以像函数一样被定义，例如：#define min(x,y) (x 但是在实际使用时，只有当写上min()，必须加括号，min才会被作为宏展开，否则不做任何处理。2. 如果宏需要参数，你可以不传，编译器会给你警告(宏参数不够)，但是这会导致错误。如C++书籍中所描述的，编译器(预处理器)对宏的语法检查不够，所以更多的检查性工作得你自己来做。3. 很多程序员不知道的#和###符号把一个符号直接转换为字符串，例如：#define STRING(x) #xconst char *str = STRING( test_string ); str的内容就是"test_string&qu 阅读全文

摘要： http://pic.dhe.ibm.com/infocenter/iseries/v7r1m0/index.jsp?topic=%2Frzarg%2Fvariable_length_arrays.htmAflexible array memberis permitted as the last element of a structure even though it has incomplete type, provided that the structure has more than one named member. A flexible array member is a C99 阅读全文

摘要： http://pic.dhe.ibm.com/infocenter/iseries/v7r1m0/index.jsp?topic=%2Frzarg%2Fvariable_length_arrays.htmVariable length arrays (C++ only)A variable length array, which is a C99 feature, is an array of automatic storage duration whose length is determined at run time.Variable length array declarator sy 阅读全文

摘要： In astructwith more than one member, the last member of thestructcan have incomplete array type. Such a member is called aflexible array memberof thestruct.NoteWhen astructhas a flexible array member, the entirestructitself has incomplete type.Flexible array members enable you to mimic dynamic type 阅读全文

摘要： Returns NARG, the number of arguments contained in __VA_ARGS__ beforeexpansion as far as NARG is >0 and <64 (cpp limits):#define PP_RSEQ_N() 63,62,61,60,[..],9,8,7,6,5,4,3,2,1,0#define PP_ARG_N(_1,_2,_3,_4,_5,_6,_7,_8,_9,[..],_61,_62,_63,N,...) N#define PP_NARG_(...) PP_ARG_N(__VA_ARGS__)#defi 阅读全文