clause_macro.rs - source

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changeset.rs mod.rs target.rs

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utf8_ranges

char_utf8.rs lib.rs

uuid

adapter

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error.rs mod.rs

parser

error.rs mod.rs

error.rs lib.rs prelude.rs

winapi

macro_rules! simple_clause {
    ($no_clause:ident, $clause:ident, $sql:expr) => {
        simple_clause!($no_clause, $clause, $sql, backend_bounds = );
    };

    ($no_clause:ident, $clause:ident, $sql:expr, backend_bounds = $($backend_bounds:ident),*) => {
        use backend::Backend;
        use result::QueryResult;
        use super::{QueryFragment, AstPass};

        #[derive(Debug, Clone, Copy, QueryId)]
        pub struct $no_clause;

        impl<DB: Backend> QueryFragment<DB> for $no_clause {
            fn walk_ast(&self, _: AstPass<DB>) -> QueryResult<()> {
                Ok(())
            }
        }

        #[derive(Debug, Clone, Copy, QueryId)]
        pub struct $clause<Expr>(pub Expr);

        impl<Expr, DB> QueryFragment<DB> for $clause<Expr> where
            DB: Backend $(+ $backend_bounds)*,
            Expr: QueryFragment<DB>,
        {
            fn walk_ast(&self, mut out: AstPass<DB>) -> QueryResult<()> {
                out.push_sql($sql);
                self.0.walk_ast(out.reborrow())?;
                Ok(())
            }
        }
    }
}