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}\n",[929,1159,1160,1194],{"__ignoreMap":927},[932,1161,1162,1165,1167,1169,1171,1173,1176,1178,1180,1182,1184,1186,1188,1190,1192],{"class":934,"line":935},[932,1163,1164],{"class":989},"Student",[932,1166,993],{"class":946},[932,1168,996],{"class":938},[932,1170,999],{"class":942},[932,1172,956],{"class":946},[932,1174,1004],{"class":1175},"sTEyZ",[932,1177,1007],{"class":946},[932,1179,1011],{"class":1175},[932,1181,1014],{"class":946},[932,1183,1017],{"class":938},[932,1185,972],{"class":1175},[932,1187,1014],{"class":946},[932,1189,1017],{"class":938},[932,1191,1088],{"class":1175},[932,1193,1132],{"class":946},[932,1195,1196,1199,1201,1203,1205,1207,1209,1211,1213,1216,1218,1220,1223,1225,1227],{"class":934,"line":950},[932,1197,1198],{"class":1175},"    : ",[932,1200,1029],{"class":989},[932,1202,993],{"class":946},[932,1204,1029],{"class":1175},[932,1206,1032],{"class":946},[932,1208,972],{"class":1175},[932,1210,1037],{"class":946},[932,1212,1040],{"class":959},[932,1214,1215],{"class":946},"},",[932,1217,1088],{"class":1175},[932,1219,1037],{"class":946},[932,1221,1222],{"class":959},"number",[932,1224,1043],{"class":946},[932,1226,1046],{"class":946},[932,1228,1049],{"class":946},[918,1230,1231,1232,1234,1235,1237,1238,1240,1241,1244],{},"编译器会抱怨 ",[929,1233,1029],{}," ",[929,1236,1040],{}," 不是成员名。确实，它们不在 ",[929,1239,1164],{}," 的成员列表中，但它们是基类 ",[929,1242,1243],{},"Person"," 的成员啊。那么怎么初始化基类成员呢？",[918,1246,1247],{},"思路是这样的：基类成员属于基类的一部分，所以它们的初始化工作应当交给基类进行。正确的写法是这样的：",[922,1249,1251],{"className":924,"code":1250,"language":926,"meta":927,"style":927},"Student(const std::string& name, int age, int number)\n    : Person(name, age), number{number} { }\n",[929,1252,1253,1285],{"__ignoreMap":927},[932,1254,1255,1257,1259,1261,1263,1265,1267,1269,1271,1273,1275,1277,1279,1281,1283],{"class":934,"line":935},[932,1256,1164],{"class":989},[932,1258,993],{"class":946},[932,1260,996],{"class":938},[932,1262,999],{"class":942},[932,1264,956],{"class":946},[932,1266,1004],{"class":1175},[932,1268,1007],{"class":946},[932,1270,1011],{"class":1175},[932,1272,1014],{"class":946},[932,1274,1017],{"class":938},[932,1276,972],{"class":1175},[932,1278,1014],{"class":946},[932,1280,1017],{"class":938},[932,1282,1088],{"class":1175},[932,1284,1132],{"class":946},[932,1286,1287,1289,1291,1293,1295,1297,1299,1301,1303,1305,1307,1309,1311],{"class":934,"line":950},[932,1288,1198],{"class":1175},[932,1290,1243],{"class":989},[932,1292,993],{"class":946},[932,1294,1029],{"class":1175},[932,1296,1014],{"class":946},[932,1298,972],{"class":1175},[932,1300,1032],{"class":946},[932,1302,1088],{"class":1175},[932,1304,1037],{"class":946},[932,1306,1222],{"class":959},[932,1308,1043],{"class":946},[932,1310,1046],{"class":946},[932,1312,1049],{"class":946},[918,1314,1315,1316,1319,1320,1323,1324,1326,1327,1329],{},"这里，",[929,1317,1318],{},"Person(name, age)"," 表示，用实参列表 ",[929,1321,1322],{},"name, age"," 调用 ",[929,1325,1243],{}," 的构造函数，从而初始化 ",[929,1328,1243],{}," 部分的成员。",[918,1331,1332],{},"如果用更形象的说法就是，一个类的基类代表了一个“成员集合”，而这个基类重载的若干个构造函数定义了这个“成员集合”的初始化方法。所以，在初始化列表中，基类的出现场合和其它成员是完全一致的——就相当于一个更“大”的成员。",[918,1334,1335],{},"我将在这一部分的结尾整理有关预置函数的细节，届时你可以更加深刻地理解“基类就是成员集合”这一说法。",[1337,1338,1339],"blockquote",{},[918,1340,1341],{},"类似地，你可以想象：这个类自己就是所有成员的一个大集合。所以类本身的名字也可以出现在构造函数的初始化列表中。这种在初始化列表中调用自身的构造函数的行为称为委托构造。委托构造不能出现递归。",[1343,1344,1345],"h2",{"id":1345},"派生类构造顺序与析构顺序",[918,1347,1348],{},"派生类在执行构造和初始化时，按照以下顺序执行：",[1350,1351,1352,1356,1359],"ol",{},[1353,1354,1355],"li",{},"构造基类部分的成员。如果初始化列表中提供了基类构造方法，则调用对应构造函数；否则默认初始化基类（部分的成员）；",[1353,1357,1358],{},"按照初始化列表或者默认初始化器对派生类“额外的”成员进行构造。若无，则默认初始化；",[1353,1360,1361],{},"执行构造函数。",[918,1363,1364],{},"可以注意到，派生类构造的方法比没有继承关系的类多了“构造基类”这一步。构造基类这件事情发生在最开始，然后才会执行成员的初始化和构造函数的执行。下面的代码演示了这三步构造的顺序：",[922,1366,1368],{"className":924,"code":1367,"language":926,"meta":927,"style":927},"#include \u003Ciostream>\nclass Base {\npublic:\n    Base() { \n        std::cout \u003C\u003C \"Base constructor\" \u003C\u003C std::endl;\n    }\n};\nclass Member {\npublic:\n    Member() {\n        std::cout \u003C\u003C \"Member constructor\" \u003C\u003C std::endl;\n    }\n};\nclass Derived : public Base {\n    Member member;\npublic:\n    Derived() {\n        std::cout \u003C\u003C \"Derived constructor\" \u003C\u003C std::endl;\n    }\n};\nint main() {\n    Derived d;\n}\n",[929,1369,1370,1386,1395,1401,1414,1448,1453,1457,1466,1472,1481,1508,1512,1516,1532,1540,1547,1557,1585,1590,1595,1608,1616],{"__ignoreMap":927},[932,1371,1372,1376,1379,1383],{"class":934,"line":935},[932,1373,1375],{"class":1374},"s7zQu","#include",[932,1377,1378],{"class":946}," \u003C",[932,1380,1382],{"class":1381},"sfazB","iostream",[932,1384,1385],{"class":946},">\n",[932,1387,1388,1390,1393],{"class":934,"line":950},[932,1389,939],{"class":938},[932,1391,1392],{"class":942}," Base",[932,1394,947],{"class":946},[932,1396,1397,1399],{"class":934,"line":966},[932,1398,980],{"class":938},[932,1400,983],{"class":946},[932,1402,1403,1406,1409,1411],{"class":934,"line":977},[932,1404,1405],{"class":989},"    Base",[932,1407,1408],{"class":946},"()",[932,1410,1046],{"class":946},[932,1412,1413],{"class":959}," \n",[932,1415,1416,1419,1421,1424,1427,1430,1433,1436,1439,1441,1443,1446],{"class":934,"line":986},[932,1417,1418],{"class":942},"        std",[932,1420,956],{"class":946},[932,1422,1423],{"class":959},"cout ",[932,1425,1426],{"class":946},"\u003C\u003C",[932,1428,1429],{"class":946}," \"",[932,1431,1432],{"class":1381},"Base constructor",[932,1434,1435],{"class":946},"\"",[932,1437,1438],{"class":946}," \u003C\u003C",[932,1440,999],{"class":942},[932,1442,956],{"class":946},[932,1444,1445],{"class":959},"endl",[932,1447,963],{"class":946},[932,1449,1450],{"class":934,"line":1052},[932,1451,1452],{"class":946},"    }\n",[932,1454,1455],{"class":934,"line":1058},[932,1456,1055],{"class":946},[932,1458,1459,1461,1464],{"class":934,"line":1065},[932,1460,939],{"class":938},[932,1462,1463],{"class":942}," Member",[932,1465,947],{"class":946},[932,1467,1468,1470],{"class":934,"line":1083},[932,1469,980],{"class":938},[932,1471,983],{"class":946},[932,1473,1474,1477,1479],{"class":934,"line":1093},[932,1475,1476],{"class":989},"    Member",[932,1478,1408],{"class":946},[932,1480,947],{"class":946},[932,1482,1483,1485,1487,1489,1491,1493,1496,1498,1500,1502,1504,1506],{"class":934,"line":1100},[932,1484,1418],{"class":942},[932,1486,956],{"class":946},[932,1488,1423],{"class":959},[932,1490,1426],{"class":946},[932,1492,1429],{"class":946},[932,1494,1495],{"class":1381},"Member constructor",[932,1497,1435],{"class":946},[932,1499,1438],{"class":946},[932,1501,999],{"class":942},[932,1503,956],{"class":946},[932,1505,1445],{"class":959},[932,1507,963],{"class":946},[932,1509,1510],{"class":934,"line":1135},[932,1511,1452],{"class":946},[932,1513,1514],{"class":934,"line":1149},[932,1515,1055],{"class":946},[932,1517,1519,1521,1524,1526,1528,1530],{"class":934,"line":1518},14,[932,1520,939],{"class":938},[932,1522,1523],{"class":942}," Derived",[932,1525,1073],{"class":946},[932,1527,1076],{"class":938},[932,1529,1392],{"class":942},[932,1531,947],{"class":946},[932,1533,1535,1538],{"class":934,"line":1534},15,[932,1536,1537],{"class":959},"    Member member",[932,1539,963],{"class":946},[932,1541,1543,1545],{"class":934,"line":1542},16,[932,1544,980],{"class":938},[932,1546,983],{"class":946},[932,1548,1550,1553,1555],{"class":934,"line":1549},17,[932,1551,1552],{"class":989},"    Derived",[932,1554,1408],{"class":946},[932,1556,947],{"class":946},[932,1558,1560,1562,1564,1566,1568,1570,1573,1575,1577,1579,1581,1583],{"class":934,"line":1559},18,[932,1561,1418],{"class":942},[932,1563,956],{"class":946},[932,1565,1423],{"class":959},[932,1567,1426],{"class":946},[932,1569,1429],{"class":946},[932,1571,1572],{"class":1381},"Derived constructor",[932,1574,1435],{"class":946},[932,1576,1438],{"class":946},[932,1578,999],{"class":942},[932,1580,956],{"class":946},[932,1582,1445],{"class":959},[932,1584,963],{"class":946},[932,1586,1588],{"class":934,"line":1587},19,[932,1589,1452],{"class":946},[932,1591,1593],{"class":934,"line":1592},20,[932,1594,1055],{"class":946},[932,1596,1598,1601,1604,1606],{"class":934,"line":1597},21,[932,1599,1600],{"class":938},"int",[932,1602,1603],{"class":989}," main",[932,1605,1408],{"class":946},[932,1607,947],{"class":946},[932,1609,1611,1614],{"class":934,"line":1610},22,[932,1612,1613],{"class":1175},"    Derived d",[932,1615,963],{"class":946},[932,1617,1619],{"class":934,"line":1618},23,[932,1620,1621],{"class":946},"}\n",[918,1623,1624],{},"类的析构顺序一般和其构造顺序是相反的。这里，典型的析构顺序是：",[1350,1626,1627,1630,1633],{},[1353,1628,1629],{},"执行析构函数；",[1353,1631,1632],{},"析构成员：顺序与构造（初始化）相反；",[1353,1634,1635],{},"析构基类。",[918,1637,1638],{},"派生类相比普通的类多了“析构基类”的操作，而这一步是发生在最后的。这也和我们的直观相吻合。",[1640,1641,1642],"style",{},"html pre.shiki code .spNyl, html code.shiki .spNyl{--shiki-light:#9C3EDA;--shiki-default:#C792EA;--shiki-dark:#C792EA}html pre.shiki code .sBMFI, html code.shiki .sBMFI{--shiki-light:#E2931D;--shiki-default:#FFCB6B;--shiki-dark:#FFCB6B}html pre.shiki code .sMK4o, html code.shiki .sMK4o{--shiki-light:#39ADB5;--shiki-default:#89DDFF;--shiki-dark:#89DDFF}html pre.shiki code .swJcz, html code.shiki .swJcz{--shiki-light:#E53935;--shiki-default:#F07178;--shiki-dark:#F07178}html pre.shiki code .s2Zo4, html code.shiki .s2Zo4{--shiki-light:#6182B8;--shiki-default:#82AAFF;--shiki-dark:#82AAFF}html pre.shiki code .sHdIc, html code.shiki .sHdIc{--shiki-light:#90A4AE;--shiki-light-font-style:italic;--shiki-default:#EEFFFF;--shiki-default-font-style:italic;--shiki-dark:#BABED8;--shiki-dark-font-style:italic}html pre.shiki code .sHwdD, html code.shiki .sHwdD{--shiki-light:#90A4AE;--shiki-light-font-style:italic;--shiki-default:#546E7A;--shiki-default-font-style:italic;--shiki-dark:#676E95;--shiki-dark-font-style:italic}html .light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html.light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html .default .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html.dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html pre.shiki code .sTEyZ, html code.shiki .sTEyZ{--shiki-light:#90A4AE;--shiki-default:#EEFFFF;--shiki-dark:#BABED8}html pre.shiki code .s7zQu, html code.shiki .s7zQu{--shiki-light:#39ADB5;--shiki-light-font-style:italic;--shiki-default:#89DDFF;--shiki-default-font-style:italic;--shiki-dark:#89DDFF;--shiki-dark-font-style:italic}html pre.shiki code .sfazB, html code.shiki .sfazB{--shiki-light:#91B859;--shiki-default:#C3E88D;--shiki-dark:#C3E88D}",{"title":927,"searchDepth":935,"depth":950,"links":1644},[1645],{"id":1345,"depth":950,"text":1345},"md",null,{},{"icon":516},{"title":526,"description":526},"aToQ14AbPCdKhzGczzxLO8CIwXhnIEnGX8ZWJdRX0ZY",[1653,1655],{"title":522,"path":523,"stem":524,"description":1654,"icon":516,"children":-1},"稍作停顿，我将在这一节中“科普”一下有关类的成员名的一些琐碎杂事。",{"title":530,"path":531,"stem":532,"description":1656,"icon":516,"children":-1},"类的继承带来了许多隐式转换的可能。它们有的很直接，有的比较间接，有的稍不留意可能引发问题。",1784618129169]