@function __negate-function($arguments...) {
    $predicate: __this('predicate');

    @return not __call($predicate, __this(), $arguments...);
}


@function __negate($predicate) {
    @if not (__function-exists($predicate)) {
        @error 'FUNC_ERROR_TEXT';
    }

    $_: __scope((
        'predicate': $predicate
    ));
    $negate-function: __bind('__negate-function');
    $_: __scope(false);

    @return $negate-function;
}


/// Creates a function that negates the result of the predicate `$function`. The
/// `$function` predicate is invoked with the `_this` binding and arguments of the
/// created function.
///
///
/// @access public
/// @group Function
/// @param {Function} $predicate The predicate to negate.
/// @returns {Function} Returns the new function.
/// @example scss
///     @function is-even($n, $args...) {
///         @return $n % 2 == 0;
///     }
///     
///     $foo: _filter((1, 2, 3, 4, 5, 6), _negate(is-even));
///     // => (1, 3, 5)

@function _negate($args...) {
    @return call(get-function('__negate'), $args...);
}