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

public member function

<string>

std::basic_string::clear

Clear string

Erases the contents of the basic_string, which becomes an empty string (with a length of 0 characters).

Parameters none

Return value none

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

int main ()
{
  char c;
  std::string str;
  std::cout << "Please type some lines of text. Enter a dot (.) to finish:\n";
  do {
    c = std::cin.get();
    str += c;
    if (c=='\n')
    {
       std::cout << str;
       str.clear();
    }
  } while (c!='.');
  return 0;
}

This program repeats every line introduced by the user until a the line contains a dot ('.'). Every newline character ('\n') triggers the repetition of the line and the clearing of the current string content.

Complexity Unspecified, but generally constant.

Iterator validity Any iterators, pointers and references related to this object may be invalidated.

Data races The object is modified.

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

See also
basic_string::erase
Erase characters from string (public member function)
basic_string::resize
Resize string (public member function)
basic_string::empty
Test whether string is empty (public member function)

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