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    {{cpp/utility/bitset/title | operator[]}}
    {{cpp/utility/bitset/title|operator[]}}
    {{cpp/utility/bitset/navbar}}
    {{cpp/utility/bitset/navbar}}
    {{ddcl list begin}}
    {{begin}}
    {{ddcl list item | num=1 | notes={{mark until c++11}}<br>{{mark since c++11}} |
    {{|num=1|=c++11|
    bool operator[]( std::size_t pos ) const;
    bool operator[]( std::size_t pos ) const;
    constexpr bool operator[]( std::size_t pos ) const;
    }}
    }}
    {{ddcl list item | num=2 |
    {{|num=2|
    reference operator[]( std::size_t pos );
    reference operator[]( std::size_t pos );
    }}
    }}
    {{ddcl list end}}
    {{end}}


    Accesses the bit at position {{tt|pos}}. The first version returns the value of the bit, the second version returns an object of type {{c|std::bitset::reference}} that allows modification of the value.
    Accesses the bit at position {{|pos}}.
    the value of the bit
    an object of type {{|std::bitset::reference}} that allows modification of the value.


    Unlike {{rlpf|test}}, does not throw exceptions: the behavior is undefined if {{tt|pos}} is out of bounds.
    {{}}
    if{{|pos }} is


    ===Parameters===
    ===Parameters===
    {{param list begin}}
    {{begin}}
    {{param list item | pos | position of the bit to return}}
    {{|pos|position of the bit to return}}
    {{param list end}}
    {{end}}


    ===Return value===
    ===Return value===
    1) the value of the requested bit
    1value of the requested bit


    2) an object of type {{c|std::bitset::reference}}, which allows writing to the requested bit.
    2object of type {{|std::bitset::reference}}, which allows writing to the requested bit.


    ===Exceptions===
    ===Exceptions===
    None


    ===Example===
    ===Example===
    {{example
    {{example
    | code=
    |code=
    #include <iostream>
    #include <iostream>
    #include <bitset>


    int main()
    int main()
    {
    {
         std::bitset<8> b1(42);
         std::bitset<8> b142
         for (std::size_t i = 0; i < b1.size(); ++i) {
         for (std::size_t i = 0; i < b1.size(); ++i)
             std::cout << "b1[" << i << "]: " << b1[i] << '\n';
             std::cout << "b1[" << i << "]: " << b1[i] << '\n';
        }
         b1[0] = true; // modifies the first bit through bitset::
         b1[0] = true; // modifies the first bit through bitset::refence
         std::cout << "After setting bit 0, the bitset holds " << b1 << '\n';
         std::cout << "After setting bit 0, holds " << b1 << '\n';
    }
    }
    | output=
    |output=
    b1[0]: 0
    b1[0]: 0
    b1[1]: 1
    b1[1]: 1
    Line 52: Line 56:
    b1[6]: 0
    b1[6]: 0
    b1[7]: 0
    b1[7]: 0
    After setting bit 0, the bitset holds 00101011
    After setting bit 0, holds 00101011
    }}
    }}


    ===See also===
    ===See also===
    {{dcl list begin}}
    {{begin}}
    {{dcl list template | cpp/utility/bitset/dcl list test}}
    {{|cpp/utility/bitset/test}}
    {{dcl list end}}
    {{end}}


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    Latest revision as of 04:54, 28 March 2025

     
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