bool empty() const; |
Checks if the string has no characters, i.e. whether begin() == end().
Parameters
(none).
Return value
true if the string is empty, false otherwise.
Exceptions
| (none) | (until C++11) |
noexcept specification: noexcept | (since C++11) |
Complexity
Constant.
Example
#include <iostream>
#include <string>
int main()
{
std::string s;
std::boolalpha(std::cout);
std::cout << "s.empty():" << s.empty() << "\t s:'" << s << "'\n";
s = "Exemplar";
std::cout << "s.empty():" << s.empty() << "\t s:'" << s << "'\n";
s = "";
std::cout << "s.empty():" << s.empty() << "\t s:'" << s << "'\n";
}Output:
s.empty():true s:'' s.empty():false s:'Exemplar' s.empty():true s:''
See also
| returns the number of characters (public member function) |
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