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C++标准的std::map迭代器是否按序迭代？ - vimacs - 02-03-2021
Stack Overflow 中相关问题：
https://stackoverflow.com/questions/7648756/is-the-order-of-iterating-through-stdmap-known-and-guaranteed-by-the-standard
答案是肯定的，这个在C++标准的Associative containers一节中说明。[n4659 26.2.6.1]
引用:11 The fundamental property of iterators of associative containers is that they iterate through the containersin the non-descending order of keys where non-descending is defined by the comparison that was used toconstruct them. For any two dereferenceable iterators i and j such that distance from i to j is positive, the following condition holds:
value_comp(*j, *i) == false