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

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

#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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https://en.cppreference.com/w/cpp/utility/bitset/operator_cmp