std::basic_string<CharT,Traits,Allocator>::empty
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bool empty() const; |
(C++11) | |
bool empty() const noexcept; |
(C++11) (C++20) |
|
[[nodiscard]] constexpr bool empty() const noexcept; |
(C++20) | |
begin() == end()
()
true false
Run this code
#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";
}
:
s.empty():true s:''
s.empty():false s:'Exemplar'
s.empty():true s:''
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