字符串:: erase(0)在空字符串上？

Question

是否在std::string::erase(0)空字符串上定义了行为.因为cppreference说:

Removes count characters starting at index.

但对于空字符串,索引0处的字符不存在.

Answer 1

似乎没问题,因为字符串的大小是0:

21.4.6.5 basic_string :: erase [string :: erase]

basic_string<charT,traits,Allocator>& erase(size_type pos = 0, size_type n = npos);

1要求: pos <= size()

2投掷:out_of_range如果pos > size().