std::bitset<N>::all, std::bitset<N>::any, std::bitset<N>::none
| (1) | ||
|
(until C++11) | |
|
(since C++11) (constexpr since C++23) |
|
| (2) | ||
|
(until C++11) | |
|
(since C++11) (constexpr since C++23) |
|
| (3) | ||
|
(until C++11) | |
|
(since C++11) (constexpr since C++23) |
1) Checks if all bits are set to
true.
2) Checks if any bits are set to
true.
3) Checks if none of the bits are set to
true.
Parameters
(none)
Return value
1)
true if all bits are set to true, otherwise false.
2)
true if any of the bits are set to true, otherwise false.
3)
true if none of the bits are set to true, otherwise false.
Example
#include <bitset>
#include <iostream>
int main()
{
std::bitset<4> b1("0000");
std::bitset<4> b2("0101");
std::bitset<4> b3("1111");
std::cout
<< "bitset\t" << "all\t" << "any\t" << "none\n"
<< b1 << '\t' << b1.all() << '\t' << b1.any() << '\t' << b1.none() << '\n'
<< b2 << '\t' << b2.all() << '\t' << b2.any() << '\t' << b2.none() << '\n'
<< b3 << '\t' << b3.all() << '\t' << b3.any() << '\t' << b3.none() << '\n';
}Output:
bitset all any none
0000 0 0 1
0101 0 1 0
1111 1 1 0Defect reports
The following behavior-changing defect reports were applied retroactively to previously published C++ standards.
| DR | Applied to | Behavior as published | Correct behavior |
|---|---|---|---|
| LWG 693 | C++98 | the member function all() was not provided |
provided |
See also
returns the number of bits set to true (public member function) |
|
|
(C++20)
|
counts the number of 1 bits in an unsigned integer (function template) |
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