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问题描述
如果我们有三个函数（foo，bar和baz）组成像这样...
If we have three functions (foo, bar, and baz) that are composed like so...
foo(bar(), baz())
before baz？
Is there any guarantee by the C++ standard that bar will be evaluated before baz?
推荐答案
不，没有这样的保证。
No, there's no such guarantee. It's undefined according to the C++ standard.
Bjarne Stroustrup在C ++编程语言第3版第6.2.2节中明确指出，还有一些推理：
Bjarne Stroustrup also says it explicitly in "The C++ Programming Language" 3rd edition section 6.2.2, with some reasoning:
虽然在技术上，这是指同一节的前面部分，它说明表达式的部分的求值顺序也是未定义的，即
Although technically this refers to an earlier part of the same section which says that the order of evaluation of parts of an expression are also undefined, i.e.
int x = f(2) + g(3); // udefined whether f() or g() is called first
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