asteris-llc/converge

// Copyright © 2016 Asteris, LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package control

import (
    "fmt"
    "reflect"
)

// NewTypeError returns a new TypeError with the appropriate expected and actual
// types.
func NewTypeError(expected string, actual interface{}) error {
    return fmt.Errorf(
        "type error: expected %s but got %s",
        expected, reflect.TypeOf(actual).String(),
    )
}

// BadPredicate returns a new error for an invalid predicate
func BadPredicate(p string) error {
    return fmt.Errorf("invalid predicate: %q", p)
}