42 lines
1 KiB
Go
42 lines
1 KiB
Go
// Copyright (c) 2023-2024 Onur Cinar.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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// https://github.com/cinar/checker
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package v2
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import "reflect"
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const (
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// nameRequired is the name of the required check.
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nameRequired = "required"
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)
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var (
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// ErrRequired indicates that a required value was missing.
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ErrRequired = NewCheckError("REQUIRED")
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)
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// Required checks if the given value of type T is its zero value. It
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// returns an error if the value is zero.
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func Required[T any](value T) (T, error) {
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_, err := reflectRequired(reflect.ValueOf(value))
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return value, err
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}
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// reflectRequired checks if the given value is its zero value. It
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// returns an error if the value is zero.
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func reflectRequired(value reflect.Value) (reflect.Value, error) {
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var err error
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if value.IsZero() {
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err = ErrRequired
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}
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return value, err
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}
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// makeRequired returns the required check function.
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func makeRequired(_ string) CheckFunc[reflect.Value] {
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return reflectRequired
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}
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