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Returns the value of the bit at the position pos.
Unlike operator[], performs a bounds check and throws std::out_of_range if pos does not correspond to a valid position in the bitset.
Parameters
| pos | - | position of the bit to return |
Return value
true if the requested bit is set, false otherwise.
Exceptions
std::out_of_range if pos does not correspond to a valid position within the bitset.
Example
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | #include <iostream>#include <bitset> int main() { std::bitset<10> b1("1111010000"); size_t idx = 0; while (idx < b1.size() && !b1.test(idx)) { ++idx; } if (idx < b1.size()) { std::cout << "first set bit at index " << idx << '\n'; } else { std::cout << "no set bits\n"; }} |
Output:
1 | first set bit at index 4 |
See also
| accesses specific bit (public member function) |
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