std::bitset<N>::all, std::bitset<N>::any, std::bitset<N>::none

 

C++

Compiler support

Freestanding and hosted

Language

Standard library

Standard library headers

Named requirements

Feature test macros (C++20)

Language support library

Concepts library (C++20)

Metaprogramming library (C++11)

Diagnostics library

General utilities library

Strings library

Containers library

Iterators library

Ranges library (C++20)

Algorithms library

Numerics library

Localizations library

Input/output library

Filesystem library (C++17)

Regular expressions library (C++11)

Concurrency support library (C++11)

Technical specifications

Symbols index

External libraries

 

Utilities library

Language support Type support (basic types, RTTI) Library feature-test macros (C++20) Dynamic memory management Program utilities Coroutine support (C++20) Variadic functions is_constant_evaluated (C++20) is_within_lifetime (C++26) initializer_list (C++11) source_location (C++20) Three-way comparison (C++20) three_way_comparablethree_way_comparable_with (C++20)(C++20) strong_ordering (C++20) weak_ordering (C++20) partial_ordering (C++20) common_comparison_category (C++20) compare_three_way_result (C++20) compare_three_way (C++20) strong_order (C++20) weak_order (C++20) partial_order (C++20) compare_strong_order_fallback (C++20) compare_weak_order_fallback (C++20) compare_partial_order_fallback (C++20)    is_eqis_neqis_ltis_lteqis_gtis_gteq (C++20)(C++20)(C++20)(C++20)(C++20)(C++20)

General utilities Date and time Function objects Formatting library (C++20) bitset hash (C++11) Relational operators (deprecated in C++20) rel_ops::operator!=rel_ops::operator> rel_ops::operator<=rel_ops::operator>= Integer comparison functions cmp_equalcmp_lesscmp_less_than (C++20)(C++20)(C++20)    cmp_not_equalcmp_greatercmp_greater_than (C++20)(C++20)(C++20) in_range (C++20) Swap and type operations swap ranges::swap (C++20) exchange (C++14) declval (C++11) to_underlying (C++23) forward (C++11) forward_like (C++23) move (C++11) move_if_noexcept (C++11) as_const (C++17) Common vocabulary types pair tuple (C++11) optional (C++17) any (C++17) variant (C++17) tuple_size (C++11) tuple_element (C++11) apply (C++17) make_from_tuple (C++17) expected (C++23) Elementary string conversions to_chars (C++17) from_chars (C++17) chars_format (C++17)

 

std::bitset

Member types

bitset::reference

Member functions

bitset::bitset

bitset::operator==bitset::operator!= (until C++20)

Element access

bitset::operator[]

bitset::test

bitset::allbitset::anybitset::none (C++11)

bitset::count

Capacity

bitset::size

Modifiers

bitset::operator&=bitset::operator|=bitset::operator^=bitset::operator~

bitset::operator<<=bitset::operator>>=bitset::operator<<bitset::operator>>

bitset::set

bitset::reset

bitset::flip

Conversions

bitset::to_string

bitset::to_ulong

bitset::to_ullong (C++11)

Non-member functions

operator&operator|operator^

operator<<operator>>

Helper classes

std::hash (C++11)

 

	(1)
bool all() const;			(until C++11)
bool all() const noexcept;			(since C++11) (until C++23)
constexpr bool all() const noexcept;			(since C++23)
		(2)
bool any() const;				(until C++11)
bool any() const noexcept;				(since C++11) (until C++23)
constexpr bool any() const noexcept;				(since C++23)
			(3)
bool none() const;					(until C++11)
bool none() const noexcept;					(since C++11) (until C++23)
constexpr bool none() const noexcept;					(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

Run this code

#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	0

Defect 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

count	returns the number of bits set to true (public member function)
popcount (C++20)	counts the number of 1 bits in an unsigned integer (function template)