std::string 中 size() 和 length() 的区别

2018 年 7 月 2 日 17:12:27C/C++评论3,362字数 89阅读 0 分 17 秒阅读模式

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：

> 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; }

> 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; }

本文由 马谦马谦马谦 发表于 2018 年 7 月 2 日 17:12:27
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