How to set a boost::optional back to an uninitialized state?
How can I "reset"/"unset" a boost::optional?
optional<int> x;
if( x )
{
// We won't hit this since x is uninitialized
}
x = 3;
if( x )
{
// Now we will hit this since x has been initialized
}
// What should I do here to bring x back to uninitialized state?
if( x )
{
// I don't want to hit this
}
x = boost::none;
One simple way is this:
x = optional<int>(); //reset to default
Or simply:
x.reset();
It destroys the current value, leaving this uninitialized (default).