20
General utilities library
[utilities]
20.14
Function objects
[function.objects]
20.14.16
Polymorphic function wrappers
[func.wrap]
20.14.16.2
Class template
function
[func.wrap.func]
20.14.16.2.3
Capacity
[func.wrap.func.cap]
🔗
explicit
operator
bool
(
)
const
noexcept
;
1
#
Returns:
true
if
*
this
has a target, otherwise
false
.