Dart\u3067\u306f\u6f14\u7b97\u5b50\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\u304c\u30b5\u30dd\u30fc\u30c8\u3055\u308c\u3066\u3044\u307e\u3059\u3002
\n
\nSample\u30af\u30e9\u30b9\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u5bfe\u3059\u308b”+”\u306f\u3001Sample.v \u306e\u5024\u3092\u8db3\u3057\u5408\u308f\u305b\u308b\u3068\u3044\u3046\u51e6\u7406\u306b\u3057\u3066\u3042\u308a\u307e\u3059\u3002operator\u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u4f7f\u3063\u3066\u6f14\u7b97\u5b50\u3068\u3057\u3066\u5b9a\u7fa9\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
\r\nclass Sample {\r\n int v;\r\n Sample(this.v);\r\n Sample operator +(Sample o) {\r\n return new Sample(this.v + o.v);\r\n }\r\n}\r\n\r\nvoid main() {\r\n Sample sample1 = new Sample(1);\r\n Sample sample2 = new Sample(3);\r\n print("sample1.v = ${sample1.v}");\r\n print("sample2.v = ${sample2.v}");\r\n Sample sample3 = sample1 + sample2;\r\n print("sample3.v = ${sample3.v}");\r\n}\r\n<\/pre>\n\u5b9f\u884c\u7d50\u679c\u306f\u4e0b\u8a18\u3002sample1\u3068sample2\u306b\u3064\u3044\u3066\u3001sample1+sample2\u3068\u3059\u308b\u3068\u3001\u5404\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306ev\u306e\u5024\u3092\u8db3\u3057\u305f\u7d50\u679c(1+3\u306e\u7d50\u679c\u3092v\u306b\u4ee3\u5165\u3055\u308c\u305fSample\u30aa\u30d6\u30b8\u30a7\u30af\u30c8)\u304c\u8fd4\u3063\u3066\u304d\u3066\u3001sample3.v \u306e\u5024\u304c 4\u3068\u306a\u3063\u3066\u3044\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u3002<\/p>\n
\r\nsample1.v = 1\r\nsample2.v = 3\r\nsample3.v = 4\r\n<\/pre>\n