home | help 
std::basic_...ng::pop_back(3)  C++ Standard Libary std::basic_...ng::pop_back(3)

NAME
     std::basic_string::pop_back - std::basic_string::pop_back

Synopsis
	void pop_back();  (constexpr since C++20)

	Removes the last character from the string.

	Equivalent  to erase(end() - 1). The behavior is undefined if the string
     is empty.

Parameters
	(none)

Return value
	(none)

Complexity
	Constant.

Exceptions
	Throws nothing.

Notes
	In libstdc++, pop_back() is not available in C++98 mode.

Example
     // Run this code

      #include <cassert>
      #include <iomanip>
      #include <iostream>
      #include <string>

      int main()
      {
	  std::string str("Short string!");
	  std::cout << "before=" << std::quoted(str) << '\n';
	  assert(str.size() == 13);

	  str.pop_back();
	  std::cout << " after=" << std::quoted(str) << '\n';
	  assert(str.size() == 12);

	  str.clear();
      //  str.pop_back(); // undefined behavior
      }

Output:
      before="Short string!"
       after="Short string"

	Defect reports

	The following behavior-changing defect	reports  were  applied	retroac-
     tively to
	previously published C++ standards.

	  DR	Applied to		Behavior as published		    Cor-
     rect behavior
	LWG   534   C++98	 std::basic_string   did  not  have  the  member
     added
			   function pop_back()

See also
	push_back appends a character to the end
		  (public member function)
	erase	  removes characters
		  (public member function)

http://cppreference.com 	   2024.06.10	   std::basic_...ng::pop_back(3)
home | help