bool test( size_t pos ) const; |
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
#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:
first set bit at index 4
See also
accesses specific bit (public member function) |
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