Sun Studio 12 Update 1:C 用户指南
(6.3.6、7.1.1)The type of integer required to hold the difference between two pointers to members of the same array, ptrdiff_t(存放指向同一数组中成员的两个指针之差所需的整型 ptrdiff_t):
stddef.h 中定义的 int。
对于 -Xarch=v9 为 long。
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