libstdc++
|
Classes | |
class | std::binary_negate< _Predicate > |
class | std::unary_negate< _Predicate > |
Functions | |
template<typename _Predicate > | |
constexpr unary_negate< _Predicate > | std::not1 (const _Predicate &__pred) |
template<typename _Predicate > | |
constexpr binary_negate< _Predicate > | std::not2 (const _Predicate &__pred) |
The function templates not1
and not2
are function object adaptors, which each take a predicate functor and wrap it in an instance of unary_negate
or binary_negate
, respectively. Those classes are functors whose operator()
evaluates the wrapped predicate function and then returns the negation of the result.
For example, given a vector of integers and a trivial predicate,
The call to find_if
will locate the first index (i) of v
for which !(v[i] > 3)
is true.
The not1/unary_negate combination works on predicates taking a single argument. The not2/binary_negate combination works on predicates taking two arguments.
not_fn
instead.
|
inlineconstexpr |
One of the negation functors.
Definition at line 1043 of file stl_function.h.
|
inlineconstexpr |
One of the negation functors.
Definition at line 1072 of file stl_function.h.