add example/genericfunc/

example/genericfunc/.gitignore

@@ -0,0 +1,3 @@
+.idea
+.vscode
+genericfunc*

example/genericfunc/main.go

@@ -0,0 +1,22 @@
+package main
+
+import (
+	"github.com/dengsgo/go-decorator/decor"
+	"log"
+)
+
+func logging(ctx *decor.Context) {
+	log.Println("logging print target in", ctx.TargetIn)
+	ctx.TargetDo()
+	log.Println("logging print target out", ctx.TargetOut)
+}
+
+//go:decor logging
+func plus[T int8 | int16 | int | int32 | int64 | float32 | float64](a, b T) T {
+	return a + b
+}
+
+func main() {
+	log.SetFlags(0)
+	log.Println("plus(1, 10) = ", plus(1, 10))
+}

example/genericfunc/main_test.go

@@ -0,0 +1,35 @@
+package main
+
+import (
+	"bytes"
+	"log"
+	"os"
+	"os/exec"
+	"strings"
+	"testing"
+)
+
+const out = `logging print target in [1 10]
+logging print target out [11]
+plus(1, 10) =  11
+`
+
+func TestPlus(t *testing.T) {
+	args := []string{
+		"go", "run", "-toolexec", "decorator", "./main.go",
+	}
+	cmd := exec.Command(args[0], args[1:]...)
+	cmd.Env = os.Environ()
+	log.Println("args", args)
+	bf := bytes.NewBuffer([]byte{})
+	cmd.Stdout = bf
+	cmd.Stderr = bf
+	err := cmd.Run()
+	if err != nil {
+		t.Fatalf("Run plus fail %s", err)
+	}
+	if strings.ReplaceAll(bf.String(), "\r\n", "\n") !=
+		strings.ReplaceAll(out, "\r\n", "\n") {
+		t.Fatalf("plus out fail, out %s", bf.String())
+	}
+}