basic_string::empty
Tests whether the string contains characters or not.
Syntax
bool empty( ) const;
Return Value
true if the string object contains no characters; false if it has at least one character.
Remarks
The member function is equivalent to size == 0.
Example
// basic_string_empty.cpp
// compile with: /EHsc
#include <string>
#include <iostream>
int main() {
using namespace std;
bool b1, b2;
string str1 ("Hello world");
cout << "The original string object str1 is: " << str1 << endl;
b1 = str1.empty();
if (b1)
cout << "The string object str1 is empty." << endl;
else
cout << "The string object str1 is not empty." << endl;
cout << endl;
// An example of an empty string object
string str2;
b2 = str2.empty();
if (b2)
cout << "The string object str2 is empty." << endl;
else
cout << "The string object str2 is not empty." << endl;
}
Output
The original string object str1 is: Hello world
The string object str1 is not empty.
The string object str2 is empty.
Requirements
Header: <string>
Namespace: std