※ 引述《Tiberius.bbs@ptt.cc (渴望平凡的幸福)》之銘言：
> ISO/IEC 14882:2003
> 5. Expressions
> 4 Except where noted, the order of evaluation of operands of individual
> operators and subexpressions of individual expressions, and the order
> in which side effects take place, is unspecified. (53) Between the
^^^^^^^^^^^^
> previous and next sequence point a scalar object shall have its
^^^^^^^^^^^^^^
> stored value modified at most once by the evaluation of an expression.
> Furthermore, the prior value shall be accessed only to determine
> the value to be stored. The requirements of this paragraph shall be
> met for each allowable ordering of the subexpressions of a full expression;
> otherwise the behavior is undefined. [Example:
其實一切都在標準規格書講得很清楚了 (這段有部分根本是從 ISO C 抄來的)，
但是有兩個被眾人淡忘其定義的基本名詞偏偏剛好是 keyword，
可能有些人因此就看不懂它在說什麼東西。
這時不妨查查 wiki：
http://en.wikipedia.org/wiki/Sequence_point
http://en.wikipedia.org/wiki/Side_effect_%28computer_science%29
這兩個名詞有它的重要性存在，
尤其是 sequence point，
因為它是 side effect 一定要作用完畢的分水嶺，
會看 sequence point 區隔 side effect 的作用區間非常重要，
這不單是為了應付考試，
trace 或 maintain 他人的程式碼時這會幫上很大的忙，
寫程式的生涯裡並不是永遠只要看自己的程式碼，
所以備妥基本觀念以防不時之需其實不會吃虧。
--
Name: Tseng, Ling-hua E-mail Address: uranus@it.muds.net
School: National Tsing Hua University Department: Computer Science
Interesting: C++, Compiler, PL/PD, OS, VM, Large-scale software design
Researching: Software pipelining for VLIW architectures
Homepage: https://it.muds.net/~uranus
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