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

public member function

<string>

std::basic_string::empty 
bool empty() const noexcept;

Test whether string is empty

Returns whether the basic_string is empty (i.e. whether its length is 0).

This function does not modify the value of the string in any way. To clear the content of a basic_string, see basic_string::clear.



Parameters none

Return Valuetrue if the string length is 0, false otherwise.

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

int main ()
{
  std::string content;
  std::string line;
  std::cout << "Please introduce a text. Enter an empty line to finish:\n";
  do {
    getline(std::cin,line);
    content += line + '\n';
  } while (!line.empty());
  std::cout << "The text you introduced was:\n" << content;
  return 0;
}

This program reads the user input line by line and stores it into string content until an empty line is introduced.

Complexity

Unspecified, but generally constant.

Constant.


Iterator validity No changes.

Data races The object is accessed.

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

See also
basic_string::clear
Clear string (public member function)
basic_string::size
Return size (public member function)
basic_string::length
Return length of string (public member function)

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