tmp/tmpq968loo3/{from.md → to.md}
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### Negators <a id="negators">[[negators]]</a>
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Negators `not1` and `not2` take a unary and a binary predicate,
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respectively, and return their complements ([[expr.unary.op]]).
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``` cpp
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template <class Predicate>
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class unary_negate {
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public:
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constexpr explicit unary_negate(const Predicate& pred);
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constexpr bool operator()(const typename Predicate::argument_type& x) const;
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typedef typename Predicate::argument_type argument_type;
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typedef bool result_type;
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};
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```
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`operator()` returns `!pred(x)`.
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``` cpp
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template <class Predicate>
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constexpr unary_negate<Predicate> not1(const Predicate& pred);
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```
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*Returns:* `unary_negate<Predicate>(pred)`.
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``` cpp
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template <class Predicate>
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class binary_negate {
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public:
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constexpr explicit binary_negate(const Predicate& pred);
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constexpr bool operator()(const typename Predicate::first_argument_type& x,
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const typename Predicate::second_argument_type& y) const;
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typedef typename Predicate::first_argument_type first_argument_type;
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typedef typename Predicate::second_argument_type second_argument_type;
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typedef bool result_type;
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};
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```
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`operator()` returns `!pred(x,y)`.
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``` cpp
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template <class Predicate>
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constexpr binary_negate<Predicate> not2(const Predicate& pred);
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```
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*Returns:* `binary_negate<Predicate>(pred)`.
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