go.charczuk.com@v0.0.0-20240327042549-bc490516bd1a/sdk/configutil/const.go (about)

     1  /*
     2  
     3  Copyright (c) 2023 - Present. Will Charczuk. All rights reserved.
     4  Use of this source code is governed by a MIT license that can be found in the LICENSE file at the root of the repository.
     5  
     6  */
     7  
     8  package configutil
     9  
    10  import (
    11  	"context"
    12  )
    13  
    14  // Const returns a constant configuration value.
    15  //
    16  // Do not reference resolved fields with this function! They will always be zero!
    17  func Const[T comparable](v T) Source[T] {
    18  	return func(_ context.Context) (*T, error) {
    19  		var zero T
    20  		if v == zero {
    21  			return nil, nil
    22  		}
    23  		return &v, nil
    24  	}
    25  }