structure: add IsStruct() method

README.md

@@ -8,7 +8,7 @@ Structure contains various utilitis to work with Go (Golang) structs.
 go get github.com/fatih/structure
 ```
 
-## Example
+## Examples
 Below is an example which converts a **struct** to a **map**
 
 ```go
@@ -32,4 +32,24 @@ if err != nil {
 fmt.Printf("%#v", m)
 // Output: map[string]interface {}{"Name":"Arslan", "ID":123456, "Enabled":true}
 ```
+
+Test if the given variable is a struct or not
+
+```go
+type Server struct {
+	Name    string
+	ID      int32
+	Enabled bool
+}
+
+s := &Server{
+	Name:    "Arslan",
+	ID:      123456,
+	Enabled: true,
+}
+
+if structure.IsStruct(s) {
+    fmt.Println("s is a struct") 
+}
+```
 	

structure.go

@@ -49,3 +49,14 @@ func ToMap(in interface{}) (map[string]interface{}, error) {
 
 	return out, nil
 }
+
+// IsStruct returns true if the given variable is a struct or a pointer to
+// struct.
+func IsStruct(strct interface{}) bool {
+	t := reflect.TypeOf(strct)
+	if t.Kind() == reflect.Ptr {
+		t = t.Elem()
+	}
+
+	return t.Kind() == reflect.Struct
+}

structure_test.go

@@ -92,3 +92,16 @@ func TestToMap_Tag(t *testing.T) {
 	}
 
 }
+
+func TestStruct(t *testing.T) {
+	var T = struct{}{}
+
+	if !IsStruct(T) {
+		t.Errorf("T should be a struct, got: %T", T)
+	}
+
+	if !IsStruct(&T) {
+		t.Errorf("T should be a struct, got: %T", T)
+	}
+
+}