std::bitset<N>::operator==, std::bitset<N>::operator!=

 

C++

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Feature test macros (C++20)

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Language support Type support (basic types, RTTI) Library feature-test macros (C++20) Program utilities Variadic functions initializer_list (C++11) is_constant_evaluated (C++20) is_within_lifetime (C++26) source_location (C++20) Coroutine support (C++20) Contract support (C++26) Three-way comparison 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_ltis_lteq (C++20)(C++20)(C++20)   is_neqis_gtis_gteq (C++20)(C++20)(C++20)

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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)

 

bool operator==( const bitset& rhs ) const;	(1)	(noexcept since C++11) (constexpr since C++23)
bool operator!=( const bitset& rhs ) const;	(2)	(noexcept since C++11) (until C++20)

1) Returns true if all of the bits in *this and rhs are equal.

2) Returns true if any of the bits in *this and rhs are not equal.

The != operator is synthesized from operator==.

(since C++20)

Parameters

rhs

-

bitset to compare

Return value

1) true if the value of each bit in *this equals the value of the corresponding bit in rhs, otherwise false.

2) true if !(*this == rhs), otherwise false.

Example

Compare given bitsets to determine if they are identical:

Run this code

#include <bitset>
#include <iostream>
 
int main()
{
    std::bitset<4> b1(0b0011);
    std::bitset<4> b2(b1);
    std::bitset<4> b3(0b0100);
 
    std::cout << std::boolalpha;
    std::cout << "b1 == b2: " << (b1 == b2) << '\n';
    std::cout << "b1 == b3: " << (b1 == b3) << '\n';
    std::cout << "b1 != b3: " << (b1 != b3) << '\n';
 
/  b1 == std::bitset<3>{}; / compile-time error: incompatible types
}

Output:

b1 == b2: true
b1 == b3: false
b1 != b3: true

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