github.com/pingcap/tiflow@v0.0.0-20240520035814-5bf52d54e205/pkg/container/sortmap/sort.go (about)

     1  // Copyright 2022 PingCAP, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // See the License for the specific language governing permissions and
    12  // limitations under the License.
    13  
    14  package sortmap
    15  
    16  import (
    17  	"sort"
    18  
    19  	"golang.org/x/exp/constraints"
    20  )
    21  
    22  // Pair represents the KV pairs in the input map of Sort.
    23  type Pair[K constraints.Ordered, V any] struct {
    24  	Key   K
    25  	Value V
    26  }
    27  
    28  // Sort converts an unordered golang map to a slice sorted by map key.
    29  func Sort[K constraints.Ordered, V any](m map[K]V) []Pair[K, V] {
    30  	s := make([]Pair[K, V], 0, len(m))
    31  	for k, v := range m {
    32  		s = append(s, Pair[K, V]{k, v})
    33  	}
    34  	sort.Slice(s, func(i, j int) bool {
    35  		return s[i].Key < s[j].Key
    36  	})
    37  	return s
    38  }