Negators not1 and not2 take a unary and a binary predicate, respectively, and return their complements ([expr.unary.op]).
template <class Predicate> class unary_negate { public: constexpr explicit unary_negate(const Predicate& pred); constexpr bool operator()(const typename Predicate::argument_type& x) const; typedef typename Predicate::argument_type argument_type; typedef bool result_type; };
operator() returns !pred(x).
template <class Predicate> constexpr unary_negate<Predicate> not1(const Predicate& pred);
Returns: unary_negate<Predicate>(pred).
template <class Predicate> class binary_negate { public: constexpr explicit binary_negate(const Predicate& pred); constexpr bool operator()(const typename Predicate::first_argument_type& x, const typename Predicate::second_argument_type& y) const; typedef typename Predicate::first_argument_type first_argument_type; typedef typename Predicate::second_argument_type second_argument_type; typedef bool result_type; };
operator() returns !pred(x,y).
template <class Predicate> constexpr binary_negate<Predicate> not2(const Predicate& pred);
Returns: binary_negate<Predicate>(pred).
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