From ac35225945e32e5b500256799e2e4d56c8c700b8 Mon Sep 17 00:00:00 2001
From: devlights <gsf.zero1@devlights.onmicrosoft.com>
Date: Tue, 30 Apr 2024 07:39:18 +0000
Subject: [PATCH] Add examples/basic/cmpop/composite_sort_key.go

---
 examples/basic/cmpop/README.md             |  9 ++---
 examples/basic/cmpop/composite_sort_key.go | 41 ++++++++++++++++++++++
 examples/basic/cmpop/examples.go           |  1 +
 3 files changed, 47 insertions(+), 4 deletions(-)
 create mode 100644 examples/basic/cmpop/composite_sort_key.go

diff --git a/examples/basic/cmpop/README.md b/examples/basic/cmpop/README.md
index 83567f85..c7eaf1f2 100644
--- a/examples/basic/cmpop/README.md
+++ b/examples/basic/cmpop/README.md
@@ -2,7 +2,8 @@
 
 このディレクトリには以下のサンプルがあります。
 
-| file       | example name  | note                                           |
-| ---------- | ------------- | ---------------------------------------------- |
-| or.go      | cmpop_or      | cmp.Or\[T comparable\]\(\) のサンプルです      |
-| compare.go | cmpop_compare | cmp.Compare\[T cmp.Orderd\]\(\) のサンプルです |
+| file                  | example name              | note                                                                  |
+| --------------------- | ------------------------- | --------------------------------------------------------------------- |
+| or.go                 | cmpop_or                  | cmp.Or\[T comparable\]\(\) のサンプルです                             |
+| compare.go            | cmpop_compare             | cmp.Compare\[T cmp.Orderd\]\(\) のサンプルです                        |
+| composite_sort_key.go | cmpop_composite_sort_keys | cmp.Or, cmp.Compareを用いて複合キーのソート処理を実装するサンプルです |
diff --git a/examples/basic/cmpop/composite_sort_key.go b/examples/basic/cmpop/composite_sort_key.go
new file mode 100644
index 00000000..3b52c3df
--- /dev/null
+++ b/examples/basic/cmpop/composite_sort_key.go
@@ -0,0 +1,41 @@
+package cmpop
+
+import (
+	"cmp"
+	"slices"
+
+	"github.com/devlights/gomy/output"
+)
+
+// CompositeSortKeys は、cmp.Or, cmp.Compareを用いて複合キーのソート処理を実装するサンプルです。
+func CompositeSortKeys() error {
+	type Person struct {
+		Name string
+		Age  uint8
+	}
+
+	var (
+		people = []Person{
+			{"Aikawa", 21},
+			{"Tanaka", 22},
+			{"Kato", 33},
+			{"Suzuki", 44},
+			{"Tanaka", 44},
+			{"Aikawa", 66},
+		}
+	)
+
+	output.Stdoutl("[before]", people)
+
+	// 名前の昇順が第１キー、年齢の降順が第２キーとする
+	slices.SortFunc(people, func(x, y Person) int {
+		return cmp.Or(
+			cmp.Compare(x.Name, y.Name),
+			-cmp.Compare(x.Age, y.Age),
+		)
+	})
+
+	output.Stdoutl("[after ]", people)
+
+	return nil
+}
diff --git a/examples/basic/cmpop/examples.go b/examples/basic/cmpop/examples.go
index 70c6503c..2f2da51a 100644
--- a/examples/basic/cmpop/examples.go
+++ b/examples/basic/cmpop/examples.go
@@ -15,4 +15,5 @@ func NewRegister() mapping.Register {
 func (r *register) Regist(m mapping.ExampleMapping) {
 	m["cmpop_or"] = Or
 	m["cmpop_compare"] = Compare
+	m["cmpop_composite_sort_keys"] = CompositeSortKeys
 }