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

From cppreference.com
< cpp‎ | utility‎ | bitset
 
 
Utilities library
General utilities
Date and time
Function objects
Formatting library (C++20)
(C++11)
Relational operators (deprecated in C++20)
Integer comparison functions
(C++20)(C++20)(C++20)   
(C++20)
Swap and type operations
(C++14)
(C++11)
(C++11)
(C++11)
(C++17)
Common vocabulary types
(C++11)
(C++17)
(C++17)
(C++17)
(C++11)
(C++17)
(C++23)
Elementary string conversions
(C++17)
(C++17)
 
 
(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