GenoM IDL optional types map onto the genom::optional
template
class.
For instance, the following IDL:
typedef optional< long > opt;
would map into
typedef genom::optional< int32_t > opt;
The interface of genom::optional
is the following:
template <typename T> struct optional { // types: typedef T value_type; typedef value_type& reference; typedef const value_type& const_reference; bool _present; value_type _value; };
The _present
member, when true
, indicates the presence of
valid data in _value
. When _present
is false
, the
_value
should be ignored.