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StudentUnion",[928,1032,974],{"class":973},[928,1034,1036,1038,1040,1042],{"class":955,"line":1035},8,[928,1037,980],{"class":966},[928,1039,983],{"class":966},[928,1041,987],{"class":986},[928,1043,990],{"class":973},[928,1045,1047,1049,1051,1053,1055],{"class":955,"line":1046},9,[928,1048,996],{"class":966},[928,1050,1000],{"class":999},[928,1052,1003],{"class":973},[928,1054,1007],{"class":1006},[928,1056,1010],{"class":973},[928,1058,1060],{"class":955,"line":1059},10,[928,1061,1016],{"class":973},[918,1063,1064],{},"但联合体和结构体总是不一样的类型。最明显的区别就是这两种类型的成员存储空间布局：",[918,1066,1067],{},[1068,1069],"img",{"alt":1070,"src":1071},"struct-and-union","https:\u002F\u002Fz3.ax1x.com\u002F2021\u002F07\u002F12\u002FWFQ2WD.png",[918,1073,1074,1075,1078,1079,1082,1083,1086,1087,1091,1092,1095,1096,1099,1100,1102,1103,1105],{},"在结构体中，存储每个成员所用的空间都是独立的。在这个例子中，",[936,1076,1077],{},"StudentStruct"," 整个结构体占 14 字节，第 1~4 字节存放  ",[936,1080,1081],{},"number"," 成员，第 5~14 字节存放 ",[936,1084,1085],{},"name"," 成员。但联合体不这样做。联合体的每一个成员都是",[1088,1089,1090],"strong",{},"重叠","存放的——即它们的存储空间总是会互相影响。所以",[1088,1093,1094],{},"整个联合体的大小只保证能够存放最大的那个成员","。在这个例子中，",[936,1097,1098],{},"StudentUnion"," 总共只占 10 个字节，第 1~4 字节存放第一个成员 ",[936,1101,1081],{},"，第 1~10 字节存放第二个成员 ",[936,1104,1085],{},"。",[918,1107,1108,1109,1111,1112,1114],{},"这种设计导致了，如果我修改了 ",[936,1110,1081],{}," 成员的值，那么 ",[936,1113,1085],{}," 成员也会变；反之同理。这导致在某一时刻下，联合体的成员列表中只能保证仅有一个成员是可用的。",[945,1116,1118],{"className":947,"code":1117,"language":949,"meta":950,"style":950},"#include \u003Ciostream>\nusing namespace std;\n\u002F\u002F 联合体\nunion StudentUnion {\n    unsigned int number;\n    char name[10];\n};\nint main() {\n    StudentUnion u;\n    u.number = 42;\n    cout \u003C\u003C u.number \u003C\u003C endl; \u002F\u002F OK，输出 42\n\u002F\u002F  cout \u003C\u003C u.name \u003C\u003C endl;   \u002F\u002F 未定义行为\n\n    u.name[0] = 'A', u.name[1] = 'l', u.name[2] = '\\0';\n    cout \u003C\u003C u.name \u003C\u003C endl;   \u002F\u002F OK，输出 Al\n\u002F\u002F  cout \u003C\u003C u.number \u003C\u003C endl; \u002F\u002F 未定义行为\n}\n",[936,1119,1120,1136,1149,1153,1161,1171,1183,1187,1201,1208,1227,1254,1263,1270,1350,1373,1382],{"__ignoreMap":950},[928,1121,1122,1126,1129,1133],{"class":955,"line":956},[928,1123,1125],{"class":1124},"s7zQu","#include",[928,1127,1128],{"class":973}," \u003C",[928,1130,1132],{"class":1131},"sfazB","iostream",[928,1134,1135],{"class":973},">\n",[928,1137,1138,1141,1144,1147],{"class":955,"line":963},[928,1139,1140],{"class":1006},"using",[928,1142,1143],{"class":966}," namespace",[928,1145,1146],{"class":969}," std",[928,1148,990],{"class":973},[928,1150,1151],{"class":955,"line":977},[928,1152,1022],{"class":959},[928,1154,1155,1157,1159],{"class":955,"line":993},[928,1156,942],{"class":966},[928,1158,1030],{"class":969},[928,1160,974],{"class":973},[928,1162,1163,1165,1167,1169],{"class":955,"line":1013},[928,1164,980],{"class":966},[928,1166,983],{"class":966},[928,1168,987],{"class":986},[928,1170,990],{"class":973},[928,1172,1173,1175,1177,1179,1181],{"class":955,"line":1019},[928,1174,996],{"class":966},[928,1176,1000],{"class":999},[928,1178,1003],{"class":973},[928,1180,1007],{"class":1006},[928,1182,1010],{"class":973},[928,1184,1185],{"class":955,"line":1025},[928,1186,1016],{"class":973},[928,1188,1189,1192,1196,1199],{"class":955,"line":1035},[928,1190,1191],{"class":966},"int",[928,1193,1195],{"class":1194},"s2Zo4"," main",[928,1197,1198],{"class":973},"()",[928,1200,974],{"class":973},[928,1202,1203,1206],{"class":955,"line":1046},[928,1204,1205],{"class":999},"    StudentUnion u",[928,1207,990],{"class":973},[928,1209,1210,1213,1216,1219,1222,1225],{"class":955,"line":1059},[928,1211,1212],{"class":999},"    u",[928,1214,1215],{"class":973},".",[928,1217,1218],{"class":999},"number ",[928,1220,1221],{"class":973},"=",[928,1223,1224],{"class":1006}," 42",[928,1226,990],{"class":973},[928,1228,1230,1233,1236,1239,1241,1243,1245,1248,1251],{"class":955,"line":1229},11,[928,1231,1232],{"class":999},"    cout ",[928,1234,1235],{"class":973},"\u003C\u003C",[928,1237,1238],{"class":999}," u",[928,1240,1215],{"class":973},[928,1242,1218],{"class":999},[928,1244,1235],{"class":973},[928,1246,1247],{"class":999}," endl",[928,1249,1250],{"class":973},";",[928,1252,1253],{"class":959}," \u002F\u002F OK，输出 42\n",[928,1255,1257,1260],{"class":955,"line":1256},12,[928,1258,1259],{"class":959},"\u002F\u002F  cout \u003C\u003C u.name \u003C\u003C endl;",[928,1261,1262],{"class":959},"   \u002F\u002F 未定义行为\n",[928,1264,1266],{"class":955,"line":1265},13,[928,1267,1269],{"emptyLinePlaceholder":1268},true,"\n",[928,1271,1273,1275,1277,1279,1281,1284,1287,1290,1293,1296,1299,1302,1304,1306,1308,1310,1313,1315,1317,1319,1322,1324,1326,1328,1330,1332,1334,1337,1339,1341,1343,1346,1348],{"class":955,"line":1272},14,[928,1274,1212],{"class":999},[928,1276,1215],{"class":973},[928,1278,1085],{"class":999},[928,1280,1003],{"class":973},[928,1282,1283],{"class":1006},"0",[928,1285,1286],{"class":973},"]",[928,1288,1289],{"class":973}," =",[928,1291,1292],{"class":973}," '",[928,1294,1295],{"class":1131},"A",[928,1297,1298],{"class":973},"'",[928,1300,1301],{"class":973},",",[928,1303,1238],{"class":999},[928,1305,1215],{"class":973},[928,1307,1085],{"class":999},[928,1309,1003],{"class":973},[928,1311,1312],{"class":1006},"1",[928,1314,1286],{"class":973},[928,1316,1289],{"class":973},[928,1318,1292],{"class":973},[928,1320,1321],{"class":1131},"l",[928,1323,1298],{"class":973},[928,1325,1301],{"class":973},[928,1327,1238],{"class":999},[928,1329,1215],{"class":973},[928,1331,1085],{"class":999},[928,1333,1003],{"class":973},[928,1335,1336],{"class":1006},"2",[928,1338,1286],{"class":973},[928,1340,1289],{"class":973},[928,1342,1292],{"class":973},[928,1344,1345],{"class":999},"\\0",[928,1347,1298],{"class":973},[928,1349,990],{"class":973},[928,1351,1353,1355,1357,1359,1361,1364,1366,1368,1370],{"class":955,"line":1352},15,[928,1354,1232],{"class":999},[928,1356,1235],{"class":973},[928,1358,1238],{"class":999},[928,1360,1215],{"class":973},[928,1362,1363],{"class":999},"name ",[928,1365,1235],{"class":973},[928,1367,1247],{"class":999},[928,1369,1250],{"class":973},[928,1371,1372],{"class":959},"   \u002F\u002F OK，输出 Al\n",[928,1374,1376,1379],{"class":955,"line":1375},16,[928,1377,1378],{"class":959},"\u002F\u002F  cout \u003C\u003C u.number \u003C\u003C endl;",[928,1380,1381],{"class":959}," \u002F\u002F 未定义行为\n",[928,1383,1385],{"class":955,"line":1384},17,[928,1386,1387],{"class":973},"}\n",[1389,1390,1391],"blockquote",{},[918,1392,1393,1394,1397,1398,1401],{},"不要写 ",[936,1395,1396],{},"u.name = \"Al\"","，再三强调过数组不能赋值。你可以使用 ",[936,1399,1400],{},"std::strcpy"," 函数来代替。",[918,1403,1404,1405,1408,1409,1412,1413,1408,1415,1417,1418,1420,1421,1423],{},"在上面的例子中，我一旦给 ",[936,1406,1407],{},"u.number"," 进行了赋值，那么 ",[936,1410,1411],{},"u.name"," 的存储空间就遭到了污染，访问它的值会导致未定义行为。反之，我一旦给 ",[936,1414,1411],{},[936,1416,1407],{}," 的值则也是未知的。所以，联合体的内存重叠特性导致我在某一时刻要么只能保证 ",[936,1419,1407],{}," 是我想要的，要么只能保证 ",[936,1422,1411],{}," 是我想要的。这个唯一可用的成员被称为联合体的活跃成员（Active member）。",[1389,1425,1426],{},[918,1427,1428,1429,1432,1433,1436],{},"切换活跃成员的表达式具有形式 ",[936,1430,1431],{},"@E1 \"=\" E2@","，其中 ",[936,1434,1435],{},"@E1@"," 是要切换到的活跃成员或者其下标、成员访问表达式。",[918,1438,1439],{},"有一种惯用手法称为带标签的联合体（Tagged union）。它利用枚举类型来更好地控制联合类型的使用，从而避免未定义行为。",[945,1441,1443],{"className":947,"code":1442,"language":949,"meta":950,"style":950},"#include \u003Ciostream>\nusing namespace std;\n\u002F\u002F 用来记录活跃成员的标签\nenum class RecordType {\n    Number,\n    Name\n};\nunion StudentUnion {\n    unsigned int number;\n    char name[10];\n};\nstruct Student {\n    RecordType type;\n    StudentUnion data;\n};\nint main() {\n    Student u;\n    \u002F\u002F 赋值前设置标签\n    u.type = RecordType::Number;\n    u.data.number = 42;\n    cout \u003C\u003C u.data.number \u003C\u003C endl; \u002F\u002F OK，输出 42\n    \u002F\u002F 赋值前设置标签\n    u.type = RecordType::Name;\n    u.data.name[0] = 'A', u.data.name[1] = 'l', u.data.name[2] = '\\0';\n    cout \u003C\u003C u.data.name \u003C\u003C endl;   \u002F\u002F OK，输出 Al\n\n    \u002F\u002F 仅当活跃成员为 number 时才输出\n    if (u.type == RecordType::Number) {\n        cout \u003C\u003C u.data.number \u003C\u003C endl;\n    }\n}\n",[936,1444,1445,1455,1465,1470,1483,1491,1496,1500,1508,1518,1530,1534,1543,1550,1557,1561,1571,1578,1584,1606,1626,1651,1656,1676,1757,1782,1787,1793,1823,1848,1854],{"__ignoreMap":950},[928,1446,1447,1449,1451,1453],{"class":955,"line":956},[928,1448,1125],{"class":1124},[928,1450,1128],{"class":973},[928,1452,1132],{"class":1131},[928,1454,1135],{"class":973},[928,1456,1457,1459,1461,1463],{"class":955,"line":963},[928,1458,1140],{"class":1006},[928,1460,1143],{"class":966},[928,1462,1146],{"class":969},[928,1464,990],{"class":973},[928,1466,1467],{"class":955,"line":977},[928,1468,1469],{"class":959},"\u002F\u002F 用来记录活跃成员的标签\n",[928,1471,1472,1475,1478,1481],{"class":955,"line":993},[928,1473,1474],{"class":966},"enum",[928,1476,1477],{"class":966}," class",[928,1479,1480],{"class":969}," RecordType",[928,1482,974],{"class":973},[928,1484,1485,1488],{"class":955,"line":1013},[928,1486,1487],{"class":999},"    Number",[928,1489,1490],{"class":973},",\n",[928,1492,1493],{"class":955,"line":1019},[928,1494,1495],{"class":999},"    Name\n",[928,1497,1498],{"class":955,"line":1025},[928,1499,1016],{"class":973},[928,1501,1502,1504,1506],{"class":955,"line":1035},[928,1503,942],{"class":966},[928,1505,1030],{"class":969},[928,1507,974],{"class":973},[928,1509,1510,1512,1514,1516],{"class":955,"line":1046},[928,1511,980],{"class":966},[928,1513,983],{"class":966},[928,1515,987],{"class":986},[928,1517,990],{"class":973},[928,1519,1520,1522,1524,1526,1528],{"class":955,"line":1059},[928,1521,996],{"class":966},[928,1523,1000],{"class":999},[928,1525,1003],{"class":973},[928,1527,1007],{"class":1006},[928,1529,1010],{"class":973},[928,1531,1532],{"class":955,"line":1229},[928,1533,1016],{"class":973},[928,1535,1536,1538,1541],{"class":955,"line":1256},[928,1537,938],{"class":966},[928,1539,1540],{"class":969}," Student",[928,1542,974],{"class":973},[928,1544,1545,1548],{"class":955,"line":1265},[928,1546,1547],{"class":986},"    RecordType type",[928,1549,990],{"class":973},[928,1551,1552,1555],{"class":955,"line":1272},[928,1553,1554],{"class":986},"    StudentUnion data",[928,1556,990],{"class":973},[928,1558,1559],{"class":955,"line":1352},[928,1560,1016],{"class":973},[928,1562,1563,1565,1567,1569],{"class":955,"line":1375},[928,1564,1191],{"class":966},[928,1566,1195],{"class":1194},[928,1568,1198],{"class":973},[928,1570,974],{"class":973},[928,1572,1573,1576],{"class":955,"line":1384},[928,1574,1575],{"class":999},"    Student u",[928,1577,990],{"class":973},[928,1579,1581],{"class":955,"line":1580},18,[928,1582,1583],{"class":959},"    \u002F\u002F 赋值前设置标签\n",[928,1585,1587,1589,1591,1594,1596,1598,1601,1604],{"class":955,"line":1586},19,[928,1588,1212],{"class":999},[928,1590,1215],{"class":973},[928,1592,1593],{"class":999},"type ",[928,1595,1221],{"class":973},[928,1597,1480],{"class":969},[928,1599,1600],{"class":973},"::",[928,1602,1603],{"class":999},"Number",[928,1605,990],{"class":973},[928,1607,1609,1611,1613,1616,1618,1620,1622,1624],{"class":955,"line":1608},20,[928,1610,1212],{"class":999},[928,1612,1215],{"class":973},[928,1614,1615],{"class":999},"data",[928,1617,1215],{"class":973},[928,1619,1218],{"class":999},[928,1621,1221],{"class":973},[928,1623,1224],{"class":1006},[928,1625,990],{"class":973},[928,1627,1629,1631,1633,1635,1637,1639,1641,1643,1645,1647,1649],{"class":955,"line":1628},21,[928,1630,1232],{"class":999},[928,1632,1235],{"class":973},[928,1634,1238],{"class":999},[928,1636,1215],{"class":973},[928,1638,1615],{"class":999},[928,1640,1215],{"class":973},[928,1642,1218],{"class":999},[928,1644,1235],{"class":973},[928,1646,1247],{"class":999},[928,1648,1250],{"class":973},[928,1650,1253],{"class":959},[928,1652,1654],{"class":955,"line":1653},22,[928,1655,1583],{"class":959},[928,1657,1659,1661,1663,1665,1667,1669,1671,1674],{"class":955,"line":1658},23,[928,1660,1212],{"class":999},[928,1662,1215],{"class":973},[928,1664,1593],{"class":999},[928,1666,1221],{"class":973},[928,1668,1480],{"class":969},[928,1670,1600],{"class":973},[928,1672,1673],{"class":999},"Name",[928,1675,990],{"class":973},[928,1677,1679,1681,1683,1685,1687,1689,1691,1693,1695,1697,1699,1701,1703,1705,1707,1709,1711,1713,1715,1717,1719,1721,1723,1725,1727,1729,1731,1733,1735,1737,1739,1741,1743,1745,1747,1749,1751,1753,1755],{"class":955,"line":1678},24,[928,1680,1212],{"class":999},[928,1682,1215],{"class":973},[928,1684,1615],{"class":999},[928,1686,1215],{"class":973},[928,1688,1085],{"class":999},[928,1690,1003],{"class":973},[928,1692,1283],{"class":1006},[928,1694,1286],{"class":973},[928,1696,1289],{"class":973},[928,1698,1292],{"class":973},[928,1700,1295],{"class":1131},[928,1702,1298],{"class":973},[928,1704,1301],{"class":973},[928,1706,1238],{"class":999},[928,1708,1215],{"class":973},[928,1710,1615],{"class":999},[928,1712,1215],{"class":973},[928,1714,1085],{"class":999},[928,1716,1003],{"class":973},[928,1718,1312],{"class":1006},[928,1720,1286],{"class":973},[928,1722,1289],{"class":973},[928,1724,1292],{"class":973},[928,1726,1321],{"class":1131},[928,1728,1298],{"class":973},[928,1730,1301],{"class":973},[928,1732,1238],{"class":999},[928,1734,1215],{"class":973},[928,1736,1615],{"class":999},[928,1738,1215],{"class":973},[928,1740,1085],{"class":999},[928,1742,1003],{"class":973},[928,1744,1336],{"class":1006},[928,1746,1286],{"class":973},[928,1748,1289],{"class":973},[928,1750,1292],{"class":973},[928,1752,1345],{"class":999},[928,1754,1298],{"class":973},[928,1756,990],{"class":973},[928,1758,1760,1762,1764,1766,1768,1770,1772,1774,1776,1778,1780],{"class":955,"line":1759},25,[928,1761,1232],{"class":999},[928,1763,1235],{"class":973},[928,1765,1238],{"class":999},[928,1767,1215],{"class":973},[928,1769,1615],{"class":999},[928,1771,1215],{"class":973},[928,1773,1363],{"class":999},[928,1775,1235],{"class":973},[928,1777,1247],{"class":999},[928,1779,1250],{"class":973},[928,1781,1372],{"class":959},[928,1783,1785],{"class":955,"line":1784},26,[928,1786,1269],{"emptyLinePlaceholder":1268},[928,1788,1790],{"class":955,"line":1789},27,[928,1791,1792],{"class":959},"    \u002F\u002F 仅当活跃成员为 number 时才输出\n",[928,1794,1796,1799,1802,1805,1807,1809,1812,1814,1816,1818,1821],{"class":955,"line":1795},28,[928,1797,1798],{"class":1124},"    if",[928,1800,1801],{"class":973}," (",[928,1803,1804],{"class":999},"u",[928,1806,1215],{"class":973},[928,1808,1593],{"class":999},[928,1810,1811],{"class":973},"==",[928,1813,1480],{"class":969},[928,1815,1600],{"class":973},[928,1817,1603],{"class":999},[928,1819,1820],{"class":973},")",[928,1822,974],{"class":973},[928,1824,1826,1829,1831,1833,1835,1837,1839,1841,1844,1846],{"class":955,"line":1825},29,[928,1827,1828],{"class":986},"        cout ",[928,1830,1235],{"class":973},[928,1832,1238],{"class":999},[928,1834,1215],{"class":973},[928,1836,1615],{"class":999},[928,1838,1215],{"class":973},[928,1840,1081],{"class":999},[928,1842,1843],{"class":973}," \u003C\u003C",[928,1845,1247],{"class":986},[928,1847,990],{"class":973},[928,1849,1851],{"class":955,"line":1850},30,[928,1852,1853],{"class":973},"    }\n",[928,1855,1857],{"class":955,"line":1856},31,[928,1858,1387],{"class":973},[918,1860,1861,1862,1865,1866,1868,1869,1871],{},"我通过额外添加一个 ",[936,1863,1864],{},"RecordType"," 枚举类型，来记录某个联合体当前时刻的活跃成员。使用的时候，将 ",[936,1867,1864],{}," 和 ",[936,1870,1098],{}," 用结构体打包在一起，然后在每次赋值（切换活跃成员）之前设置标签。这样，我只需要在访问联合体成员检查标签即可保证不触发未定义行为。",[918,1873,1874,1875,1878],{},"我们",[1088,1876,1877],{},"不推荐","在 C++ 中使用联合体。",[1389,1880,1881],{},[918,1882,1883],{},"C++ 为保证与 C 的兼容性，提供了匿名联合体语法。由匿名联合体形成的带标签联合体可以省去所有不必要的名字：",[945,1885,1887],{"className":947,"code":1886,"language":949,"meta":950,"style":950},"#include \u003Ciostream>\nusing namespace std;\nstruct Student {\n    enum {\n        Number,\n        Name\n    } type;  \u002F\u002F 略去枚举类型名，直接给出成员 type 的类型\n    \u002F\u002F Number 和 Name 位于 Student 作用域下，通过 Student:: 前缀访问\n    union {\n        unsigned int number;\n        char name[10];\n    }; \u002F\u002F C 风格语法：匿名联合体，其成员注入到上层作用域；\n    \u002F\u002F 即可直接访问 Student::number 和 Student::name，保留内存重叠特性\n};\nint main() {\n    Student u;\n\n    u.type = Student::Number;\n    u.number = 42;\n    cout \u003C\u003C u.number \u003C\u003C endl;\n\n    u.type = Student::Name;\n    u.name[0] = 'A', u.name[1] = 'l', u.name[2] = '\\0';\n    cout \u003C\u003C u.name \u003C\u003C endl;\n\n    if (u.type == Student::Number) {\n        cout \u003C\u003C u.number \u003C\u003C endl;\n    }\n}\n",[936,1888,1889,1899,1909,1917,1924,1931,1936,1949,1954,1961,1972,1985,1993,1998,2002,2012,2018,2022,2040,2054,2072,2076,2094,2162,2180,2184,2208,2226,2230],{"__ignoreMap":950},[928,1890,1891,1893,1895,1897],{"class":955,"line":956},[928,1892,1125],{"class":1124},[928,1894,1128],{"class":973},[928,1896,1132],{"class":1131},[928,1898,1135],{"class":973},[928,1900,1901,1903,1905,1907],{"class":955,"line":963},[928,1902,1140],{"class":1006},[928,1904,1143],{"class":966},[928,1906,1146],{"class":969},[928,1908,990],{"class":973},[928,1910,1911,1913,1915],{"class":955,"line":977},[928,1912,938],{"class":966},[928,1914,1540],{"class":969},[928,1916,974],{"class":973},[928,1918,1919,1922],{"class":955,"line":993},[928,1920,1921],{"class":966},"    enum",[928,1923,974],{"class":973},[928,1925,1926,1929],{"class":955,"line":1013},[928,1927,1928],{"class":999},"        Number",[928,1930,1490],{"class":973},[928,1932,1933],{"class":955,"line":1019},[928,1934,1935],{"class":999},"        Name\n",[928,1937,1938,1941,1944,1946],{"class":955,"line":1025},[928,1939,1940],{"class":973},"    }",[928,1942,1943],{"class":986}," type",[928,1945,1250],{"class":973},[928,1947,1948],{"class":959},"  \u002F\u002F 略去枚举类型名，直接给出成员 type 的类型\n",[928,1950,1951],{"class":955,"line":1035},[928,1952,1953],{"class":959},"    \u002F\u002F Number 和 Name 位于 Student 作用域下，通过 Student:: 前缀访问\n",[928,1955,1956,1959],{"class":955,"line":1046},[928,1957,1958],{"class":966},"    union",[928,1960,974],{"class":973},[928,1962,1963,1966,1968,1970],{"class":955,"line":1059},[928,1964,1965],{"class":966},"        unsigned",[928,1967,983],{"class":966},[928,1969,987],{"class":986},[928,1971,990],{"class":973},[928,1973,1974,1977,1979,1981,1983],{"class":955,"line":1229},[928,1975,1976],{"class":966},"        char",[928,1978,1000],{"class":999},[928,1980,1003],{"class":973},[928,1982,1007],{"class":1006},[928,1984,1010],{"class":973},[928,1986,1987,1990],{"class":955,"line":1256},[928,1988,1989],{"class":973},"    };",[928,1991,1992],{"class":959}," \u002F\u002F C 风格语法：匿名联合体，其成员注入到上层作用域；\n",[928,1994,1995],{"class":955,"line":1265},[928,1996,1997],{"class":959},"    \u002F\u002F 即可直接访问 Student::number 和 Student::name，保留内存重叠特性\n",[928,1999,2000],{"class":955,"line":1272},[928,2001,1016],{"class":973},[928,2003,2004,2006,2008,2010],{"class":955,"line":1352},[928,2005,1191],{"class":966},[928,2007,1195],{"class":1194},[928,2009,1198],{"class":973},[928,2011,974],{"class":973},[928,2013,2014,2016],{"class":955,"line":1375},[928,2015,1575],{"class":999},[928,2017,990],{"class":973},[928,2019,2020],{"class":955,"line":1384},[928,2021,1269],{"emptyLinePlaceholder":1268},[928,2023,2024,2026,2028,2030,2032,2034,2036,2038],{"class":955,"line":1580},[928,2025,1212],{"class":999},[928,2027,1215],{"class":973},[928,2029,1593],{"class":999},[928,2031,1221],{"class":973},[928,2033,1540],{"class":969},[928,2035,1600],{"class":973},[928,2037,1603],{"class":999},[928,2039,990],{"class":973},[928,2041,2042,2044,2046,2048,2050,2052],{"class":955,"line":1586},[928,2043,1212],{"class":999},[928,2045,1215],{"class":973},[928,2047,1218],{"class":999},[928,2049,1221],{"class":973},[928,2051,1224],{"class":1006},[928,2053,990],{"class":973},[928,2055,2056,2058,2060,2062,2064,2066,2068,2070],{"class":955,"line":1608},[928,2057,1232],{"class":999},[928,2059,1235],{"class":973},[928,2061,1238],{"class":999},[928,2063,1215],{"class":973},[928,2065,1218],{"class":999},[928,2067,1235],{"class":973},[928,2069,1247],{"class":999},[928,2071,990],{"class":973},[928,2073,2074],{"class":955,"line":1628},[928,2075,1269],{"emptyLinePlaceholder":1268},[928,2077,2078,2080,2082,2084,2086,2088,2090,2092],{"class":955,"line":1653},[928,2079,1212],{"class":999},[928,2081,1215],{"class":973},[928,2083,1593],{"class":999},[928,2085,1221],{"class":973},[928,2087,1540],{"class":969},[928,2089,1600],{"class":973},[928,2091,1673],{"class":999},[928,2093,990],{"class":973},[928,2095,2096,2098,2100,2102,2104,2106,2108,2110,2112,2114,2116,2118,2120,2122,2124,2126,2128,2130,2132,2134,2136,2138,2140,2142,2144,2146,2148,2150,2152,2154,2156,2158,2160],{"class":955,"line":1658},[928,2097,1212],{"class":999},[928,2099,1215],{"class":973},[928,2101,1085],{"class":999},[928,2103,1003],{"class":973},[928,2105,1283],{"class":1006},[928,2107,1286],{"class":973},[928,2109,1289],{"class":973},[928,2111,1292],{"class":973},[928,2113,1295],{"class":1131},[928,2115,1298],{"class":973},[928,2117,1301],{"class":973},[928,2119,1238],{"class":999},[928,2121,1215],{"class":973},[928,2123,1085],{"class":999},[928,2125,1003],{"class":973},[928,2127,1312],{"class":1006},[928,2129,1286],{"class":973},[928,2131,1289],{"class":973},[928,2133,1292],{"class":973},[928,2135,1321],{"class":1131},[928,2137,1298],{"class":973},[928,2139,1301],{"class":973},[928,2141,1238],{"class":999},[928,2143,1215],{"class":973},[928,2145,1085],{"class":999},[928,2147,1003],{"class":973},[928,2149,1336],{"class":1006},[928,2151,1286],{"class":973},[928,2153,1289],{"class":973},[928,2155,1292],{"class":973},[928,2157,1345],{"class":999},[928,2159,1298],{"class":973},[928,2161,990],{"class":973},[928,2163,2164,2166,2168,2170,2172,2174,2176,2178],{"class":955,"line":1678},[928,2165,1232],{"class":999},[928,2167,1235],{"class":973},[928,2169,1238],{"class":999},[928,2171,1215],{"class":973},[928,2173,1363],{"class":999},[928,2175,1235],{"class":973},[928,2177,1247],{"class":999},[928,2179,990],{"class":973},[928,2181,2182],{"class":955,"line":1759},[928,2183,1269],{"emptyLinePlaceholder":1268},[928,2185,2186,2188,2190,2192,2194,2196,2198,2200,2202,2204,2206],{"class":955,"line":1784},[928,2187,1798],{"class":1124},[928,2189,1801],{"class":973},[928,2191,1804],{"class":999},[928,2193,1215],{"class":973},[928,2195,1593],{"class":999},[928,2197,1811],{"class":973},[928,2199,1540],{"class":969},[928,2201,1600],{"class":973},[928,2203,1603],{"class":999},[928,2205,1820],{"class":973},[928,2207,974],{"class":973},[928,2209,2210,2212,2214,2216,2218,2220,2222,2224],{"class":955,"line":1789},[928,2211,1828],{"class":986},[928,2213,1235],{"class":973},[928,2215,1238],{"class":999},[928,2217,1215],{"class":973},[928,2219,1081],{"class":999},[928,2221,1843],{"class":973},[928,2223,1247],{"class":986},[928,2225,990],{"class":973},[928,2227,2228],{"class":955,"line":1795},[928,2229,1853],{"class":973},[928,2231,2232],{"class":955,"line":1825},[928,2233,1387],{"class":973},[2235,2236,2237],"style",{},"html 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type，又译共用体）类型是一种很奇怪的类型。","md",null,{},{"icon":272},{"title":411,"description":2240},"LF--GJ_6rPNLQDYephbPd6NVZT5RS5_5heyf0RCLPgo",[2248,2250],{"title":93,"path":408,"stem":409,"description":2249,"icon":272,"children":-1},"本章总结",{"title":415,"path":417,"stem":421,"description":2251,"icon":416,"children":-1},"初探面向对象",1784618096445]