STL 中的 string 类有两个方法 size()和 length()用来返回字符串的长度。
两者在实现上没有区别：
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> sed -n 907,918p /usr/include/c++/7/bits/basic_string.h // Capacity: /// Returns the number of characters in the string, not including any /// null-termination. size_type size() const _GLIBCXX_NOEXCEPT { return _M_string_length; } /// Returns the number of characters in the string, not including any /// null-termination. size_type length() const _GLIBCXX_NOEXCEPT { return _M_string_length; } |