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Showing content from https://cplusplus.com/reference/string/basic_string/length/ below:

public member function

<string>

std::basic_string::length 
size_type length() const;
size_type length() const noexcept;

Return length of string

Returns the length of the string, in terms of number of characters.

This is the number of actual characters that conform the contents of the basic_string, which is not necessarily equal to its storage capacity.

Both basic_string::size and basic_string::length are synonyms and return the same value.



Parameters none

Return Value The number of characters in the string.

Member type size_type is an unsigned integral type.



Example 
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// string::length
#include <iostream>
#include <string>

int main ()
{
  std::string str ("Test string");
  std::cout << "The size of str is " << str.length() << " characters.\n";
  return 0;
}

Output: 
The size of str is 11 characters


Complexity
Iterator validity No changes.

Data races The object is accessed.

Exception safetyNo-throw guarantee: this member function never throws exceptions.

See also
basic_string::size
Return size (public member function)
basic_string::resize
Resize string (public member function)
basic_string::max_size
Return maximum size (public member function)
basic_string::capacity
Return size of allocated storage (public member function)

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