public member function
<bitset>
std::bitset::to_ulong
unsigned long to_ulong() const;
Convert to unsigned long integer
Returns an unsigned long with the integer value that has the same bits set as the bitset.
If the bitset size is too big to be represented in a value of type unsigned long, the function throws an exception of type overflow_error.
Return value
Integer value with the same bit representation as the bitset object.
Example
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// bitset::to_ulong
#include <iostream> // std::cout
#include <bitset> // std::bitset
int main ()
{
std::bitset<4> foo; // foo: 0000
foo.set(); // foo: 1111
std::cout << foo << " as an integer is: " << foo.to_ulong() << '\n';
return 0;
}
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Output:
1111 as an integer is: 15
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Data races
The bitset is accessed.
Exception safety
Strong guarantee: if an exception is thrown, there are no changes in the bitset.
If the bitset size is too big to be represented by the return type, overflow_error is thrown.