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use expression::grouped::Grouped; use expression::AsExpression; use helper_types::not; use sql_types::Bool; /// Creates a SQL `NOT` expression /// /// # Example /// /// ```rust /// # #[macro_use] extern crate diesel; /// # include!("../doctest_setup.rs"); /// # /// # fn main() { /// # use schema::users::dsl::*; /// # let connection = establish_connection(); /// use diesel::dsl::not; /// /// let users_with_name = users.select(id).filter(name.eq("Sean")); /// let users_not_with_name = users.select(id).filter( /// not(name.eq("Sean"))); /// /// assert_eq!(Ok(1), users_with_name.first(&connection)); /// assert_eq!(Ok(2), users_not_with_name.first(&connection)); /// # } /// ``` pub fn not<T: AsExpression<Bool>>(expr: T) -> not<T> { super::operators::Not::new(Grouped(expr.as_expression())) }