22
General utilities library
[utilities]
22.5
Optional objects
[optional]
22.5.4
Partial specialization of
optional
for reference types
[optional.optional.ref]
22.5.4.8
Modifiers
[optional.ref.mod]
🔗
constexpr
void
reset
(
)
noexcept
;
1
#
Effects
: Assigns
nullptr
to
val
.
2
#
Postconditions
:
*
this
does not contain a value
.