public member function
std::array::empty
<array>
constexpr bool empty() noexcept;
Test whether array is empty
Returns a bool value indicating whether the array container is empty, i.e. whether its size is 0.
This function does not modify the content of the array in any way. To clear the content of an array object, use array::fill.
Return Value
true if the array size is 0, false otherwise.
This is a constexpr.
Example
1 2 3 4 5 6 7 8 9 10 11 12
|
// array::empty
#include <iostream>
#include <array>
int main ()
{
std::array<int,0> first;
std::array<int,5> second;
std::cout << "first " << (first.empty() ? "is empty" : "is not empty" ) << std::endl;
std::cout << "second " << (second.empty() ? "is empty" : "is not empty" ) << std::endl;
return 0;
}
|
Output:
first is empty
second is not empty
|
Iterator validity
No changes.
See also
- array::fill
- Fill array with value (public member function
)
- array::size
- Return size (public member function
)