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Published: Jul 21, 2022 License: Apache-2.0 Imports: 4 Imported by: 1



Package compare contains the implementation of the compare plugin, which generates the deriveCompare function.

The deriveCompare function is a maintainable and fast way to implement fast Less functions.

deriveCompare(T, T) bool
deriveCompare(T) func(T) bool

When goderive walks over your code it is looking for a function that:

  • was not implemented (or was previously derived) and
  • has a predefined prefix.

In the following code the deriveCompare function will be found, because it was not implemented and it has a prefix deriveCompare. This prefix is configurable.

package main

import "sort"

type MyStruct struct {
	Int64     int64
	StringPtr *string

func sortStructs(ss []*MyStruct) {
	sort.Slice(ss,  func(i, j int) bool {
			return deriveCompare(ss[i], ss[j]) < 0

Supported types:

  • basic types
  • named structs
  • slices
  • maps
  • pointers to these types
  • private fields of structs in external packages (using reflect and unsafe)
  • and many more

Unsupported types:

  • chan
  • interface
  • function
  • unnamed structs, which are not comparable with the == operator

Example output can be found here:

This plugin has been tested thoroughly.



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func New

New is a constructor for the compare code generator. This generator should be reconstructed for each package.

func NewPlugin

func NewPlugin() derive.Plugin

NewPlugin creates a new compare plugin. This function returns the plugin name, default prefix and a constructor for the compare code generator.


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