Macro diesel::diesel_prefix_operator

macro_rules! diesel_prefix_operator {
    ($name : ident, $operator : expr) => { ... };
    ($name : ident, $operator : expr, backend : $backend : ty) => { ... };
    ($name : ident, $operator : expr, $return_ty : ty) => { ... };
    ($name : ident, $operator : expr, $return_ty : ty, backend : $backend : ty) => { ... };
}

Useful for libraries adding support for new SQL types. Apps should never need to call this.

Similar to diesel_infix_operator!, but the generated type will only take a single argument rather than two. The operator SQL will be placed before the single argument. See diesel_infix_operator! for example usage.