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前提是长度得相等\n",[940,1021,1023,1026,1028,1031,1034,1037,1040,1043,1046,1049,1052,1054,1057,1060],{"class":942,"line":1022},3,[940,1024,1025],{"class":988},"    for",[940,1027,992],{"class":954},[940,1029,1030],{"class":946},"unsigned",[940,1032,1033],{"class":995}," i{",[940,1035,1036],{"class":958},"0",[940,1038,1039],{"class":995},"}",[940,1041,1042],{"class":954},";",[940,1044,1045],{"class":995}," i ",[940,1047,1048],{"class":954},"\u003C",[940,1050,1051],{"class":995}," len",[940,1053,1042],{"class":954},[940,1055,1056],{"class":995}," i",[940,1058,1059],{"class":954},"++)",[940,1061,982],{"class":954},[940,1063,1065,1068,1070,1073,1076,1080,1083,1086,1088,1090,1092,1094,1096],{"class":942,"line":1064},4,[940,1066,1067],{"class":988},"        if",[940,1069,992],{"class":954},[940,1071,1072],{"class":995},"str",[940,1074,1075],{"class":954},"[",[940,1077,1079],{"class":1078},"swJcz","i",[940,1081,1082],{"class":954},"]",[940,1084,1085],{"class":954}," !=",[940,1087,976],{"class":995},[940,1089,1004],{"class":954},[940,1091,1072],{"class":995},[940,1093,1075],{"class":954},[940,1095,1079],{"class":1078},[940,1097,1098],{"class":954},"])\n",[940,1100,1102,1105,1107],{"class":942,"line":1101},5,[940,1103,1104],{"class":988},"            return",[940,1106,1015],{"class":954},[940,1108,1109],{"class":1018},"             \u002F\u002F 如果某一位不相等则不等\n",[940,1111,1113],{"class":942,"line":1112},6,[940,1114,1115],{"class":954},"    }\n",[940,1117,1119,1122],{"class":942,"line":1118},7,[940,1120,1121],{"class":988},"    return",[940,1123,1124],{"class":954}," true;\n",[940,1126,1128],{"class":942,"line":1127},8,[940,1129,1130],{"class":954},"}\n",[918,1132,1133],{},"函数的工作原理很简单。注意从这里开始我们就用类外定义的形式来写成员函数了，减少一些篇幅（所以如果你在跟着操作的话，请不要忘记在类内添加上对应的声明）。",[918,1135,1136],{},"然后我们尝试使用它。",[931,1138,1140],{"className":933,"code":1139,"language":935,"meta":936,"style":936},"#include \u003Ciostream>\nint main() {\n    String a(\"Hello\"); \u002F\u002F 你可以自己改变这个初始化值，看看效果变化\n    \u002F\u002F 下面的 \"Hello\" 通过两次隐式转换到 String，然后调用 == 重载\n    if (a == \"Hello\") {\n        std::cout \u003C\u003C \"Hi\" \u003C\u003C std::endl;\n    }\n}\n",[922,1141,1142,1157,1171,1195,1200,1222,1256,1260],{"__ignoreMap":936},[940,1143,1144,1147,1150,1154],{"class":942,"line":943},[940,1145,1146],{"class":988},"#include",[940,1148,1149],{"class":954}," \u003C",[940,1151,1153],{"class":1152},"sfazB","iostream",[940,1155,1156],{"class":954},">\n",[940,1158,1159,1162,1166,1169],{"class":942,"line":985},[940,1160,1161],{"class":946},"int",[940,1163,1165],{"class":1164},"s2Zo4"," main",[940,1167,1168],{"class":954},"()",[940,1170,982],{"class":954},[940,1172,1173,1176,1179,1181,1184,1187,1189,1192],{"class":942,"line":1022},[940,1174,1175],{"class":995},"    String ",[940,1177,1178],{"class":1164},"a",[940,1180,964],{"class":954},[940,1182,1183],{"class":954},"\"",[940,1185,1186],{"class":1152},"Hello",[940,1188,1183],{"class":954},[940,1190,1191],{"class":954},");",[940,1193,1194],{"class":1018}," \u002F\u002F 你可以自己改变这个初始化值，看看效果变化\n",[940,1196,1197],{"class":942,"line":1064},[940,1198,1199],{"class":1018},"    \u002F\u002F 下面的 \"Hello\" 通过两次隐式转换到 String，然后调用 == 重载\n",[940,1201,1202,1204,1206,1209,1211,1214,1216,1218,1220],{"class":942,"line":1101},[940,1203,989],{"class":988},[940,1205,992],{"class":954},[940,1207,1208],{"class":995},"a ",[940,1210,928],{"class":954},[940,1212,1213],{"class":954}," \"",[940,1215,1186],{"class":1152},[940,1217,1183],{"class":954},[940,1219,979],{"class":954},[940,1221,982],{"class":954},[940,1223,1224,1227,1229,1232,1235,1237,1240,1242,1245,1248,1250,1253],{"class":942,"line":1112},[940,1225,1226],{"class":950},"        std",[940,1228,955],{"class":954},[940,1230,1231],{"class":1078},"cout ",[940,1233,1234],{"class":954},"\u003C\u003C",[940,1236,1213],{"class":954},[940,1238,1239],{"class":1152},"Hi",[940,1241,1183],{"class":954},[940,1243,1244],{"class":954}," \u003C\u003C",[940,1246,1247],{"class":950}," std",[940,1249,955],{"class":954},[940,1251,1252],{"class":1078},"endl",[940,1254,1255],{"class":954},";\n",[940,1257,1258],{"class":942,"line":1118},[940,1259,1115],{"class":954},[940,1261,1262],{"class":942,"line":1127},[940,1263,1130],{"class":954},[918,1265,1266,1267,1269,1270,1273],{},"现在看上去没有问题，当 ",[922,1268,1178],{}," 为 ",[922,1271,1272],{},"\"Hello\""," 的时候输出，不相等的时候不输出。那么接下来我们想扩展这段程序，把判断相等的部分挪到一个单独的函数中去。",[931,1275,1277],{"className":933,"code":1276,"language":935,"meta":936,"style":936},"#include \u003Ciostream>\n\u002F\u002F 只需要 x 的值，所以用只读引用防止复制开销和更改\nbool isOk(const String& x) {\n    return x == \"Hello\" || x == \"Hi\";\n}\nint main() {\n    String a(\"Hello\");\n    if (isOk(a)) {\n        std::cout \u003C\u003C \"How are you?\" \u003C\u003C std::endl;\n    }\n}\n",[922,1278,1279,1289,1294,1316,1346,1350,1360,1377,1395,1423,1428],{"__ignoreMap":936},[940,1280,1281,1283,1285,1287],{"class":942,"line":943},[940,1282,1146],{"class":988},[940,1284,1149],{"class":954},[940,1286,1153],{"class":1152},[940,1288,1156],{"class":954},[940,1290,1291],{"class":942,"line":985},[940,1292,1293],{"class":1018},"\u002F\u002F 只需要 x 的值，所以用只读引用防止复制开销和更改\n",[940,1295,1296,1298,1301,1303,1305,1307,1309,1312,1314],{"class":942,"line":1022},[940,1297,947],{"class":946},[940,1299,1300],{"class":1164}," isOk",[940,1302,964],{"class":954},[940,1304,967],{"class":946},[940,1306,951],{"class":950},[940,1308,972],{"class":946},[940,1310,1311],{"class":975}," x",[940,1313,979],{"class":954},[940,1315,982],{"class":954},[940,1317,1318,1320,1323,1325,1327,1329,1331,1334,1336,1338,1340,1342,1344],{"class":942,"line":1064},[940,1319,1121],{"class":988},[940,1321,1322],{"class":995}," x ",[940,1324,928],{"class":954},[940,1326,1213],{"class":954},[940,1328,1186],{"class":1152},[940,1330,1183],{"class":954},[940,1332,1333],{"class":954}," ||",[940,1335,1322],{"class":995},[940,1337,928],{"class":954},[940,1339,1213],{"class":954},[940,1341,1239],{"class":1152},[940,1343,1183],{"class":954},[940,1345,1255],{"class":954},[940,1347,1348],{"class":942,"line":1101},[940,1349,1130],{"class":954},[940,1351,1352,1354,1356,1358],{"class":942,"line":1112},[940,1353,1161],{"class":946},[940,1355,1165],{"class":1164},[940,1357,1168],{"class":954},[940,1359,982],{"class":954},[940,1361,1362,1364,1366,1368,1370,1372,1374],{"class":942,"line":1118},[940,1363,1175],{"class":995},[940,1365,1178],{"class":1164},[940,1367,964],{"class":954},[940,1369,1183],{"class":954},[940,1371,1186],{"class":1152},[940,1373,1183],{"class":954},[940,1375,1376],{"class":954},");\n",[940,1378,1379,1381,1383,1386,1388,1390,1393],{"class":942,"line":1127},[940,1380,989],{"class":988},[940,1382,992],{"class":954},[940,1384,1385],{"class":1164},"isOk",[940,1387,964],{"class":954},[940,1389,1178],{"class":995},[940,1391,1392],{"class":954},"))",[940,1394,982],{"class":954},[940,1396,1398,1400,1402,1404,1406,1408,1411,1413,1415,1417,1419,1421],{"class":942,"line":1397},9,[940,1399,1226],{"class":950},[940,1401,955],{"class":954},[940,1403,1231],{"class":1078},[940,1405,1234],{"class":954},[940,1407,1213],{"class":954},[940,1409,1410],{"class":1152},"How are you?",[940,1412,1183],{"class":954},[940,1414,1244],{"class":954},[940,1416,1247],{"class":950},[940,1418,955],{"class":954},[940,1420,1252],{"class":1078},[940,1422,1255],{"class":954},[940,1424,1426],{"class":942,"line":1425},10,[940,1427,1115],{"class":954},[940,1429,1431],{"class":942,"line":1430},11,[940,1432,1130],{"class":954},[918,1434,1435,1436,1438,1439,1442,1443,1445],{},"感觉没问题，但真有问题。你会发现编译过不了了。为什么呢？问题就出在 ",[922,1437,1385],{}," 的参数 ",[922,1440,1441],{},"x"," 是带 ",[922,1444,967],{}," 限定的。",[918,1447,1448,1449,1452,1453,1456,1457,1460],{},"假如我有一个类 ",[922,1450,1451],{},"A","，它有一个成员数据 ",[922,1454,1455],{},"data"," 和一个成员函数 ",[922,1458,1459],{},"change","：",[931,1462,1464],{"className":933,"code":1463,"language":935,"meta":936,"style":936},"struct A {\n    int data;\n    void change() {\n        data++;\n    }\n};\nint main() {\n    const A a;\n\u002F\u002F  a.change();  \u002F\u002F 编译错误\n}\n",[922,1465,1466,1476,1486,1498,1506,1510,1515,1525,1535,1543],{"__ignoreMap":936},[940,1467,1468,1471,1474],{"class":942,"line":943},[940,1469,1470],{"class":946},"struct",[940,1472,1473],{"class":950}," A",[940,1475,982],{"class":954},[940,1477,1478,1481,1484],{"class":942,"line":985},[940,1479,1480],{"class":946},"    int",[940,1482,1483],{"class":1078}," data",[940,1485,1255],{"class":954},[940,1487,1488,1491,1494,1496],{"class":942,"line":1022},[940,1489,1490],{"class":946},"    void",[940,1492,1493],{"class":1164}," change",[940,1495,1168],{"class":954},[940,1497,982],{"class":954},[940,1499,1500,1503],{"class":942,"line":1064},[940,1501,1502],{"class":1078},"        data",[940,1504,1505],{"class":954},"++;\n",[940,1507,1508],{"class":942,"line":1101},[940,1509,1115],{"class":954},[940,1511,1512],{"class":942,"line":1112},[940,1513,1514],{"class":954},"};\n",[940,1516,1517,1519,1521,1523],{"class":942,"line":1118},[940,1518,1161],{"class":946},[940,1520,1165],{"class":1164},[940,1522,1168],{"class":954},[940,1524,982],{"class":954},[940,1526,1527,1530,1533],{"class":942,"line":1127},[940,1528,1529],{"class":946},"    const",[940,1531,1532],{"class":995}," A a",[940,1534,1255],{"class":954},[940,1536,1537,1540],{"class":942,"line":1397},[940,1538,1539],{"class":1018},"\u002F\u002F  a.change();",[940,1541,1542],{"class":1018},"  \u002F\u002F 编译错误\n",[940,1544,1545],{"class":942,"line":1425},[940,1546,1130],{"class":954},[918,1548,1549,1550,1553,1554,1556,1557,1559,1560,1562,1563,1565,1566,1562,1568,1570,1571,1575],{},"那么，在 ",[922,1551,1552],{},"main"," 函数里面声明并定义只读的 ",[922,1555,1451],{}," 类型对象 ",[922,1558,1178],{},"。如果 ",[922,1561,1178],{}," 的 ",[922,1564,1459],{}," 能被调用的话，那么 ",[922,1567,1178],{},[922,1569,1455],{}," 成员就会发生更改，这就不符合“只读”的含义了。所以默认情形下",[1572,1573,1574],"strong",{},"不能调用只读对象的成员函数","。",[918,1577,1578,1579,1582,1583,1585],{},"如果想要一个只读对象的成员函数可以被调用，需要给这个函数",[1572,1580,1581],{},"整体","加上 ",[922,1584,967],{}," 限定。它的语法是：",[1587,1588,1589],"sdsc",{},[918,1590,1591,1592,1595],{},"返回值类型 类名\"::\"成员函数名\"(\"",[940,1593,1594],{},"参数列表","\") const\" 函数体",[918,1597,1598,1599,1601,1602,1604],{},"也就是说把 ",[922,1600,967],{}," 关键字加在参数列表和函数体之间。这种被整体 ",[922,1603,967],{}," 限定的成员函数称为只读成员函数。比如：",[931,1606,1608],{"className":933,"code":1607,"language":935,"meta":936,"style":936},"struct A {\n    int data;\n    void change() const {\n\u002F\u002F      data++; \u002F\u002F 编译错误\n    }\n};\n",[922,1609,1610,1618,1626,1639,1647,1651],{"__ignoreMap":936},[940,1611,1612,1614,1616],{"class":942,"line":943},[940,1613,1470],{"class":946},[940,1615,1473],{"class":950},[940,1617,982],{"class":954},[940,1619,1620,1622,1624],{"class":942,"line":985},[940,1621,1480],{"class":946},[940,1623,1483],{"class":1078},[940,1625,1255],{"class":954},[940,1627,1628,1630,1632,1634,1637],{"class":942,"line":1022},[940,1629,1490],{"class":946},[940,1631,1493],{"class":1164},[940,1633,1168],{"class":954},[940,1635,1636],{"class":946}," const",[940,1638,982],{"class":954},[940,1640,1641,1644],{"class":942,"line":1064},[940,1642,1643],{"class":1018},"\u002F\u002F      data++;",[940,1645,1646],{"class":1018}," \u002F\u002F 编译错误\n",[940,1648,1649],{"class":942,"line":1101},[940,1650,1115],{"class":954},[940,1652,1653],{"class":942,"line":1112},[940,1654,1514],{"class":954},[918,1656,1657,1658,1661,1662,1665],{},"很显然，只读成员函数内部不能对成员数据做更改，也不能调用非只读的成员函数。也就是说，只读成员函数中的 ",[922,1659,1660],{},"this"," 类型是 ",[922,1663,1664],{},"const T*"," 的。",[918,1667,1668,1669,1671,1672,1674,1675,1678,1679,1682,1683,1682,1686,1689,1690,1692],{},"于是基于此，我们意识到原来的 ",[922,1670,924],{}," 类有许多函数是不会更改成员数据的，那么它们都应该整体加上 ",[922,1673,967],{}," 限定。比如刚刚的 ",[922,1676,1677],{},"operator==","，又比如 ",[922,1680,1681],{},"operator+"," ",[922,1684,1685],{},"length",[922,1687,1688],{},"operator bool","。于是给他们加上 ",[922,1691,967],{}," 限定就好了（声明和定义都需要）。",[1694,1695,1696],"h2",{"id":1696},"只读与非只读重载",[918,1698,1699,1700,1703],{},"现在问题来到了 ",[922,1701,1702],{},"operator[]"," 上。",[931,1705,1707],{"className":933,"code":1706,"language":935,"meta":936,"style":936},"char String::operator[](\u002Funsigned pos) {\n    return str[pos];\n}\n",[922,1708,1709,1735,1750],{"__ignoreMap":936},[940,1710,1711,1714,1716,1718,1720,1723,1726,1728,1731,1733],{"class":942,"line":943},[940,1712,1713],{"class":946},"char",[940,1715,951],{"class":950},[940,1717,955],{"class":954},[940,1719,959],{"class":958},[940,1721,1722],{"class":950},"[]",[940,1724,1725],{"class":954},"(\u002F",[940,1727,1030],{"class":946},[940,1729,1730],{"class":975}," pos",[940,1732,979],{"class":954},[940,1734,982],{"class":954},[940,1736,1737,1739,1742,1744,1747],{"class":942,"line":985},[940,1738,1121],{"class":988},[940,1740,1741],{"class":995}," str",[940,1743,1075],{"class":954},[940,1745,1746],{"class":995},"pos",[940,1748,1749],{"class":954},"];\n",[940,1751,1752],{"class":942,"line":1022},[940,1753,1130],{"class":954},[918,1755,1756,1757,1760,1761,1764],{},"首先我们先把返回值类型改成引用。否则的话，形如 ",[922,1758,1759],{},"a[0] = '@'"," 的表达式是没有效果的（这个原理类似之前返回 ",[922,1762,1763],{},"*this","）。于是：",[931,1766,1768],{"className":933,"code":1767,"language":935,"meta":936,"style":936},"char& String::operator[](\u002Funsigned pos) {\n    return str[pos];\n}\n",[922,1769,1770,1793,1805],{"__ignoreMap":936},[940,1771,1772,1775,1777,1779,1781,1783,1785,1787,1789,1791],{"class":942,"line":943},[940,1773,1774],{"class":946},"char&",[940,1776,951],{"class":950},[940,1778,955],{"class":954},[940,1780,959],{"class":958},[940,1782,1722],{"class":950},[940,1784,1725],{"class":954},[940,1786,1030],{"class":946},[940,1788,1730],{"class":975},[940,1790,979],{"class":954},[940,1792,982],{"class":954},[940,1794,1795,1797,1799,1801,1803],{"class":942,"line":985},[940,1796,1121],{"class":988},[940,1798,1741],{"class":995},[940,1800,1075],{"class":954},[940,1802,1746],{"class":995},[940,1804,1749],{"class":954},[940,1806,1807],{"class":942,"line":1022},[940,1808,1130],{"class":954},[918,1810,1811,1812,1814,1815,1817,1818,1820,1821,1824,1825,1828,1829,1831],{},"那么问题就是：这个函数该不该被整体 ",[922,1813,967],{}," 限定呢？如果不设置为只读的，那么我就没法对只读对象调用 ",[922,1816,1702],{}," 了。但如果设置为只读的，那么 ",[922,1819,1759],{}," 还是编译不过：只读成员函数中 ",[922,1822,1823],{},"str[pos]"," 是 ",[922,1826,1827],{},"const char"," 类型的，不能绑定到非只读的 ",[922,1830,1774],{}," 引用上。",[931,1833,1835],{"className":933,"code":1834,"language":935,"meta":936,"style":936},"char& String::operator[](\u002Funsigned pos) const {\n    return str[pos]; \u002F\u002F 编译错误：不能将只读类型绑定到非只读引用上去\n}\n",[922,1836,1837,1861,1877],{"__ignoreMap":936},[940,1838,1839,1841,1843,1845,1847,1849,1851,1853,1855,1857,1859],{"class":942,"line":943},[940,1840,1774],{"class":946},[940,1842,951],{"class":950},[940,1844,955],{"class":954},[940,1846,959],{"class":958},[940,1848,1722],{"class":950},[940,1850,1725],{"class":954},[940,1852,1030],{"class":946},[940,1854,1730],{"class":975},[940,1856,979],{"class":954},[940,1858,1636],{"class":946},[940,1860,982],{"class":954},[940,1862,1863,1865,1867,1869,1871,1874],{"class":942,"line":985},[940,1864,1121],{"class":988},[940,1866,1741],{"class":995},[940,1868,1075],{"class":954},[940,1870,1746],{"class":995},[940,1872,1873],{"class":954},"];",[940,1875,1876],{"class":1018}," \u002F\u002F 编译错误：不能将只读类型绑定到非只读引用上去\n",[940,1878,1879],{"class":942,"line":1022},[940,1880,1130],{"class":954},[918,1882,1883,1884,1886],{},"最终的解决方法是利用函数重载，声明两个 ",[922,1885,1702],{}," 成员函数，分别对应只读和非只读的版本：",[931,1888,1890],{"className":933,"code":1889,"language":935,"meta":936,"style":936},"\u002F\u002F 非只读版本\nchar& String::operator[](\u002Funsigned pos) {\n    return str[pos];\n}\n\u002F\u002F 只读版本\nconst char& String::operator[](\u002Funsigned pos) const {\n    return str[pos];\n}\n",[922,1891,1892,1897,1919,1931,1935,1940,1967,1979],{"__ignoreMap":936},[940,1893,1894],{"class":942,"line":943},[940,1895,1896],{"class":1018},"\u002F\u002F 非只读版本\n",[940,1898,1899,1901,1903,1905,1907,1909,1911,1913,1915,1917],{"class":942,"line":985},[940,1900,1774],{"class":946},[940,1902,951],{"class":950},[940,1904,955],{"class":954},[940,1906,959],{"class":958},[940,1908,1722],{"class":950},[940,1910,1725],{"class":954},[940,1912,1030],{"class":946},[940,1914,1730],{"class":975},[940,1916,979],{"class":954},[940,1918,982],{"class":954},[940,1920,1921,1923,1925,1927,1929],{"class":942,"line":1022},[940,1922,1121],{"class":988},[940,1924,1741],{"class":995},[940,1926,1075],{"class":954},[940,1928,1746],{"class":995},[940,1930,1749],{"class":954},[940,1932,1933],{"class":942,"line":1064},[940,1934,1130],{"class":954},[940,1936,1937],{"class":942,"line":1101},[940,1938,1939],{"class":1018},"\u002F\u002F 只读版本\n",[940,1941,1942,1944,1947,1949,1951,1953,1955,1957,1959,1961,1963,1965],{"class":942,"line":1112},[940,1943,967],{"class":946},[940,1945,1946],{"class":946}," char&",[940,1948,951],{"class":950},[940,1950,955],{"class":954},[940,1952,959],{"class":958},[940,1954,1722],{"class":950},[940,1956,1725],{"class":954},[940,1958,1030],{"class":946},[940,1960,1730],{"class":975},[940,1962,979],{"class":954},[940,1964,1636],{"class":946},[940,1966,982],{"class":954},[940,1968,1969,1971,1973,1975,1977],{"class":942,"line":1118},[940,1970,1121],{"class":988},[940,1972,1741],{"class":995},[940,1974,1075],{"class":954},[940,1976,1746],{"class":995},[940,1978,1749],{"class":954},[940,1980,1981],{"class":942,"line":1127},[940,1982,1130],{"class":954},[918,1984,1985,1986,1988,1989,1991],{},"然后，在调用 ",[922,1987,1702],{}," 时，编译器会优先选择整体带 ",[922,1990,967],{}," 限定的重载；如果不能，则选择非只读的。",[931,1993,1995],{"className":933,"code":1994,"language":935,"meta":936,"style":936},"int main() {\n    const String a(\"Hello\");\n    String b(\"Hello\");\n    a[0]; \u002F\u002F 调用只读版本\n    b[0]; \u002F\u002F 调用非只读版本\n}\n",[922,1996,1997,2007,2026,2043,2057,2071],{"__ignoreMap":936},[940,1998,1999,2001,2003,2005],{"class":942,"line":943},[940,2000,1161],{"class":946},[940,2002,1165],{"class":1164},[940,2004,1168],{"class":954},[940,2006,982],{"class":954},[940,2008,2009,2011,2014,2016,2018,2020,2022,2024],{"class":942,"line":985},[940,2010,1529],{"class":946},[940,2012,2013],{"class":995}," String ",[940,2015,1178],{"class":1164},[940,2017,964],{"class":954},[940,2019,1183],{"class":954},[940,2021,1186],{"class":1152},[940,2023,1183],{"class":954},[940,2025,1376],{"class":954},[940,2027,2028,2030,2033,2035,2037,2039,2041],{"class":942,"line":1022},[940,2029,1175],{"class":995},[940,2031,2032],{"class":1164},"b",[940,2034,964],{"class":954},[940,2036,1183],{"class":954},[940,2038,1186],{"class":1152},[940,2040,1183],{"class":954},[940,2042,1376],{"class":954},[940,2044,2045,2048,2050,2052,2054],{"class":942,"line":1064},[940,2046,2047],{"class":995},"    a",[940,2049,1075],{"class":954},[940,2051,1036],{"class":958},[940,2053,1873],{"class":954},[940,2055,2056],{"class":1018}," \u002F\u002F 调用只读版本\n",[940,2058,2059,2062,2064,2066,2068],{"class":942,"line":1101},[940,2060,2061],{"class":995},"    b",[940,2063,1075],{"class":954},[940,2065,1036],{"class":958},[940,2067,1873],{"class":954},[940,2069,2070],{"class":1018}," \u002F\u002F 调用非只读版本\n",[940,2072,2073],{"class":942,"line":1112},[940,2074,1130],{"class":954},[2076,2077,2078],"blockquote",{},[918,2079,2080,2081,2083,2084,2087,2088,2091],{},"只有成员函数才可以整体（在最顶层）加 ",[922,2082,967],{}," 限定。比如你定义类型别名 ",[922,2085,2086],{},"using T = void()const;","，那么 ",[922,2089,2090],{},"T"," 只能作为成员类型出现在类的定义里，不能在类外使用。",[1694,2093,2094],{"id":2094},"只读成员数据",[918,2096,2097],{},"最后，我们简单提一下只读成员数据。既然是只读的，它就没有办法通过任何方式被赋值：",[931,2099,2101],{"className":933,"code":2100,"language":935,"meta":936,"style":936},"struct A {\n    const int data{0}; \u002F\u002F 只读成员数据\n    A() {\n        data = 1;      \u002F\u002F 错误：不能对只读类型赋值\n    }\n    void f() const {   \u002F\u002F 这与函数 const 限定与否无关\n        data = 1;      \u002F\u002F 错误：不能对只读类型赋值\n    }\n};\n",[922,2102,2103,2111,2131,2140,2156,2160,2177,2189,2193],{"__ignoreMap":936},[940,2104,2105,2107,2109],{"class":942,"line":943},[940,2106,1470],{"class":946},[940,2108,1473],{"class":950},[940,2110,982],{"class":954},[940,2112,2113,2115,2118,2120,2123,2125,2128],{"class":942,"line":985},[940,2114,1529],{"class":946},[940,2116,2117],{"class":946}," int",[940,2119,1483],{"class":1078},[940,2121,2122],{"class":954},"{",[940,2124,1036],{"class":958},[940,2126,2127],{"class":954},"};",[940,2129,2130],{"class":1018}," \u002F\u002F 只读成员数据\n",[940,2132,2133,2136,2138],{"class":942,"line":1022},[940,2134,2135],{"class":1164},"    A",[940,2137,1168],{"class":954},[940,2139,982],{"class":954},[940,2141,2142,2145,2148,2151,2153],{"class":942,"line":1064},[940,2143,2144],{"class":1078},"        data ",[940,2146,2147],{"class":954},"=",[940,2149,2150],{"class":958}," 1",[940,2152,1042],{"class":954},[940,2154,2155],{"class":1018},"      \u002F\u002F 错误：不能对只读类型赋值\n",[940,2157,2158],{"class":942,"line":1101},[940,2159,1115],{"class":954},[940,2161,2162,2164,2167,2169,2171,2174],{"class":942,"line":1112},[940,2163,1490],{"class":946},[940,2165,2166],{"class":1164}," f",[940,2168,1168],{"class":954},[940,2170,1636],{"class":946},[940,2172,2173],{"class":954}," {",[940,2175,2176],{"class":1018},"   \u002F\u002F 这与函数 const 限定与否无关\n",[940,2178,2179,2181,2183,2185,2187],{"class":942,"line":1118},[940,2180,2144],{"class":1078},[940,2182,2147],{"class":954},[940,2184,2150],{"class":958},[940,2186,1042],{"class":954},[940,2188,2155],{"class":1018},[940,2190,2191],{"class":942,"line":1127},[940,2192,1115],{"class":954},[940,2194,2195],{"class":942,"line":1397},[940,2196,1514],{"class":954},[918,2198,2199],{},"而且，只读数据成员必须被显式地初始化，这和我们之前的写法是一致的：",[931,2201,2203],{"className":933,"code":2202,"language":935,"meta":936,"style":936},"int main() {\n    const int a;     \u002F\u002F 错误：只读对象必须被初始化\n    const int b{42}; \u002F\u002F OK\n}\n",[922,2204,2205,2215,2229,2248],{"__ignoreMap":936},[940,2206,2207,2209,2211,2213],{"class":942,"line":943},[940,2208,1161],{"class":946},[940,2210,1165],{"class":1164},[940,2212,1168],{"class":954},[940,2214,982],{"class":954},[940,2216,2217,2219,2221,2224,2226],{"class":942,"line":985},[940,2218,1529],{"class":946},[940,2220,2117],{"class":946},[940,2222,2223],{"class":995}," a",[940,2225,1042],{"class":954},[940,2227,2228],{"class":1018},"     \u002F\u002F 错误：只读对象必须被初始化\n",[940,2230,2231,2233,2235,2238,2240,2243,2245],{"class":942,"line":1022},[940,2232,1529],{"class":946},[940,2234,2117],{"class":946},[940,2236,2237],{"class":995}," b",[940,2239,2122],{"class":954},[940,2241,2242],{"class":958},"42",[940,2244,2127],{"class":954},[940,2246,2247],{"class":1018}," \u002F\u002F OK\n",[940,2249,2250],{"class":942,"line":1064},[940,2251,1130],{"class":954},[918,2253,2254],{},"所以说，这就要求只读成员必须拥有一个默认成员初始化器，或者出现在成员初始化列表中：",[931,2256,2258],{"className":933,"code":2257,"language":935,"meta":936,"style":936},"struct A {\n    const int data; \u002F\u002F 如果这里不带默认初始化器的话……\n    A(): data{42} { \u002F\u002F 那么这里必须为它初始化\n    }\n};\n",[922,2259,2260,2268,2281,2301,2305],{"__ignoreMap":936},[940,2261,2262,2264,2266],{"class":942,"line":943},[940,2263,1470],{"class":946},[940,2265,1473],{"class":950},[940,2267,982],{"class":954},[940,2269,2270,2272,2274,2276,2278],{"class":942,"line":985},[940,2271,1529],{"class":946},[940,2273,2117],{"class":946},[940,2275,1483],{"class":1078},[940,2277,1042],{"class":954},[940,2279,2280],{"class":1018}," \u002F\u002F 如果这里不带默认初始化器的话……\n",[940,2282,2283,2285,2288,2290,2292,2294,2296,2298],{"class":942,"line":1022},[940,2284,2135],{"class":1164},[940,2286,2287],{"class":954},"():",[940,2289,1483],{"class":1164},[940,2291,2122],{"class":954},[940,2293,2242],{"class":958},[940,2295,1039],{"class":954},[940,2297,2173],{"class":954},[940,2299,2300],{"class":1018}," \u002F\u002F 那么这里必须为它初始化\n",[940,2302,2303],{"class":942,"line":1064},[940,2304,1115],{"class":954},[940,2306,2307],{"class":942,"line":1101},[940,2308,1514],{"class":954},[2310,2311,2312],"style",{},"html pre.shiki 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