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std::char_traits::length

STD：：CHAR[医]特征：长度

static std::size_t length( const char_type* s ​(until C++17)
static constexpr std::size_t length( const char_type* s ​(since C++17)

所指向的字符序列的长度。s，即终止空字符%28的位置。CharT()29%。

参数

s-pointer to a character sequence to return length of

返回值

所指字符序列的长度s...

例外

%280%29

复杂性

线性的。

例

二次

#include <iostream>
 
void print(const char* str)
{
  std::cout << "string '" << str << "' ";
  std::cout << "length = " << std::char_traits<char>::length(str) << '\n';
}
 
int main()
{
  print("foo"
 
  std::string s("booo"
  print(s.c_str()
}

二次

产出：

二次

string 'foo' length = 3
string 'booo' length = 4

二次

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