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a",[957,1150,985],{"class":971},[957,1152,1153],{"class":959,"line":988},[957,1154,1042],{"class":971},[957,1156,1157,1159,1161,1163],{"class":959,"line":994},[957,1158,997],{"class":963},[957,1160,1001],{"class":1000},[957,1162,1004],{"class":971},[957,1164,972],{"class":971},[957,1166,1167,1170,1172,1175,1177,1179],{"class":959,"line":1009},[957,1168,1169],{"class":967},"    Ns",[957,1171,1125],{"class":971},[957,1173,1174],{"class":1012},"a ",[957,1176,1030],{"class":971},[957,1178,1034],{"class":1033},[957,1180,985],{"class":971},[957,1182,1183],{"class":959,"line":1018},[957,1184,1042],{"class":971},[918,1186,1187,1188,1191,1192,1194,1195,1126],{},"这里面，",[929,1189,1190],{},"A::mem"," 的道理是一样的。但在语义层面上，这个名字的存储期不是静态的——也就是说，它并不是像全局变量一样的存在，而是一个 ",[929,1193,931],{}," 类型对象的一部分。所以，直接使用这个名字在语义上是过不去的（不求值语境除外），需要通过一个成员访问运算符来指明是哪个对象的 ",[929,1196,1190],{},[948,1198,1200],{"className":950,"code":1199,"language":952,"meta":953,"style":953},"struct A {\n    int mem;\n};\nint main() {\n    A a;\n    sizeof(A::mem); \u002F\u002F OK，不求值的话还好\n\u002F\u002F  A::mem = 42;    \u002F\u002F 需要求值的话会导致编译错误：要给哪个 mem 赋值？\n    a.A::mem = 42;  \u002F\u002F 告诉编译器：是给 a 的 mem 赋值\n}\n",[929,1201,1202,1210,1218,1222,1232,1238,1255,1263,1281],{"__ignoreMap":953},[957,1203,1204,1206,1208],{"class":959,"line":960},[957,1205,964],{"class":963},[957,1207,968],{"class":967},[957,1209,972],{"class":971},[957,1211,1212,1214,1216],{"class":959,"line":975},[957,1213,978],{"class":963},[957,1215,982],{"class":981},[957,1217,985],{"class":971},[957,1219,1220],{"class":959,"line":988},[957,1221,991],{"class":971},[957,1223,1224,1226,1228,1230],{"class":959,"line":994},[957,1225,997],{"class":963},[957,1227,1001],{"class":1000},[957,1229,1004],{"class":971},[957,1231,972],{"class":971},[957,1233,1234,1236],{"class":959,"line":1009},[957,1235,1013],{"class":1012},[957,1237,985],{"class":971},[957,1239,1240,1243,1245,1247,1249,1252],{"class":959,"line":1018},[957,1241,1242],{"class":971},"    sizeof(",[957,1244,931],{"class":967},[957,1246,1125],{"class":971},[957,1248,935],{"class":1012},[957,1250,1251],{"class":971},");",[957,1253,1254],{"class":1105}," \u002F\u002F OK，不求值的话还好\n",[957,1256,1257,1260],{"class":959,"line":1039},[957,1258,1259],{"class":1105},"\u002F\u002F  A::mem = 42;",[957,1261,1262],{"class":1105},"    \u002F\u002F 需要求值的话会导致编译错误：要给哪个 mem 赋值？\n",[957,1264,1266,1268,1270,1272,1274,1276,1278],{"class":959,"line":1265},8,[957,1267,1021],{"class":1012},[957,1269,1024],{"class":971},[957,1271,1095],{"class":1012},[957,1273,1030],{"class":971},[957,1275,1034],{"class":1033},[957,1277,1102],{"class":971},[957,1279,1280],{"class":1105},"  \u002F\u002F 告诉编译器：是给 a 的 mem 赋值\n",[957,1282,1284],{"class":959,"line":1283},9,[957,1285,1042],{"class":971},[918,1287,1288,1289,1291],{},"另一方面，我们知道静态成员是不归属任何一个变量的、类似全局变量一样的东西。这就是为什么对静态成员的访问可以直接用 ",[929,1290,1190],{},"。",[948,1293,1295],{"className":950,"code":1294,"language":952,"meta":953,"style":953},"struct A {\n    static int mem;\n};\nint A::mem{}; \u002F\u002F 静态成员需要额外定义\nint main() {\n    A::mem = 42; \u002F\u002F 静态成员不需要指定是“谁的”。它是“所有 A 类型对象共享的”\n}\n",[929,1296,1297,1305,1317,1321,1337,1347,1365],{"__ignoreMap":953},[957,1298,1299,1301,1303],{"class":959,"line":960},[957,1300,964],{"class":963},[957,1302,968],{"class":967},[957,1304,972],{"class":971},[957,1306,1307,1310,1313,1315],{"class":959,"line":975},[957,1308,1309],{"class":963},"    static",[957,1311,1312],{"class":963}," int",[957,1314,982],{"class":981},[957,1316,985],{"class":971},[957,1318,1319],{"class":959,"line":988},[957,1320,991],{"class":971},[957,1322,1323,1325,1327,1329,1331,1334],{"class":959,"line":994},[957,1324,997],{"class":963},[957,1326,968],{"class":967},[957,1328,1125],{"class":971},[957,1330,935],{"class":1012},[957,1332,1333],{"class":971},"{};",[957,1335,1336],{"class":1105}," \u002F\u002F 静态成员需要额外定义\n",[957,1338,1339,1341,1343,1345],{"class":959,"line":1009},[957,1340,997],{"class":963},[957,1342,1001],{"class":1000},[957,1344,1004],{"class":971},[957,1346,972],{"class":971},[957,1348,1349,1352,1354,1356,1358,1360,1362],{"class":959,"line":1018},[957,1350,1351],{"class":967},"    A",[957,1353,1125],{"class":971},[957,1355,1027],{"class":1012},[957,1357,1030],{"class":971},[957,1359,1034],{"class":1033},[957,1361,1102],{"class":971},[957,1363,1364],{"class":1105}," \u002F\u002F 静态成员不需要指定是“谁的”。它是“所有 A 类型对象共享的”\n",[957,1366,1367],{"class":959,"line":1039},[957,1368,1042],{"class":971},[918,1370,1371,1372,1375,1376,1378,1379,1382,1383,1386,1387,1291],{},"然而在没有继承语义的时候，",[929,1373,1374],{},"a."," 右侧的东西肯定是 ",[929,1377,931],{}," “命名空间”下的名字，所以实际上我们经常写的 ",[929,1380,1381],{},"a.mem"," 是省略了 ",[929,1384,1385],{},"A::"," 的 ",[929,1388,1389],{},"a.A::mem",[922,1391,1392],{"id":1392},"继承中的成员名",[918,1394,1395],{},"现在来看出现继承之后，成员访问表达式省略了什么、",[948,1397,1399],{"className":950,"code":1398,"language":952,"meta":953,"style":953},"struct Base {\n    int b;\n};\nstruct Derived : Base { \u002F\u002F 公开继承\n    int d;\n};\nint main() {\n    Derived a;\n    a.b; \u002F\u002F 这里略去的 b 的“命名空间”是谁？\n    a.d; \u002F\u002F 这里略去的 d 的“命名空间”是谁？\n}\n",[929,1400,1401,1410,1419,1423,1442,1451,1455,1465,1472,1486,1501],{"__ignoreMap":953},[957,1402,1403,1405,1408],{"class":959,"line":960},[957,1404,964],{"class":963},[957,1406,1407],{"class":967}," Base",[957,1409,972],{"class":971},[957,1411,1412,1414,1417],{"class":959,"line":975},[957,1413,978],{"class":963},[957,1415,1416],{"class":981}," b",[957,1418,985],{"class":971},[957,1420,1421],{"class":959,"line":988},[957,1422,991],{"class":971},[957,1424,1425,1427,1430,1433,1436,1439],{"class":959,"line":994},[957,1426,964],{"class":963},[957,1428,1429],{"class":967}," Derived",[957,1431,1432],{"class":971}," :",[957,1434,1435],{"class":981}," Base ",[957,1437,1438],{"class":971},"{",[957,1440,1441],{"class":1105}," \u002F\u002F 公开继承\n",[957,1443,1444,1446,1449],{"class":959,"line":1009},[957,1445,978],{"class":963},[957,1447,1448],{"class":981}," d",[957,1450,985],{"class":971},[957,1452,1453],{"class":959,"line":1018},[957,1454,991],{"class":971},[957,1456,1457,1459,1461,1463],{"class":959,"line":1039},[957,1458,997],{"class":963},[957,1460,1001],{"class":1000},[957,1462,1004],{"class":971},[957,1464,972],{"class":971},[957,1466,1467,1470],{"class":959,"line":1265},[957,1468,1469],{"class":1012},"    Derived a",[957,1471,985],{"class":971},[957,1473,1474,1476,1478,1481,1483],{"class":959,"line":1283},[957,1475,1021],{"class":1012},[957,1477,1024],{"class":971},[957,1479,1480],{"class":1012},"b",[957,1482,1102],{"class":971},[957,1484,1485],{"class":1105}," \u002F\u002F 这里略去的 b 的“命名空间”是谁？\n",[957,1487,1489,1491,1493,1496,1498],{"class":959,"line":1488},10,[957,1490,1021],{"class":1012},[957,1492,1024],{"class":971},[957,1494,1495],{"class":1012},"d",[957,1497,1102],{"class":971},[957,1499,1500],{"class":1105}," \u002F\u002F 这里略去的 d 的“命名空间”是谁？\n",[957,1502,1504],{"class":959,"line":1503},11,[957,1505,1042],{"class":971},[918,1507,1508,1509,1512,1513,1516,1517,1126],{},"当然，正如刚才说的：既然 ",[929,1510,1511],{},"a"," 是 ",[929,1514,1515],{},"Derived"," 类型，省去的正是 ",[929,1518,1519],{},"Derived::",[948,1521,1523],{"className":950,"code":1522,"language":952,"meta":953,"style":953},"struct Base { int b; };\nstruct Derived : Base { int d; };\nint main() {\n    Derived a;\n    a.Derived::b; \u002F\u002F 确实是\n    a.Derived::d;\n}\n",[929,1524,1525,1543,1563,1573,1579,1593,1604],{"__ignoreMap":953},[957,1526,1527,1529,1531,1534,1536,1538,1540],{"class":959,"line":960},[957,1528,964],{"class":963},[957,1530,1407],{"class":967},[957,1532,1533],{"class":971}," {",[957,1535,1312],{"class":963},[957,1537,1416],{"class":981},[957,1539,1102],{"class":971},[957,1541,1542],{"class":971}," };\n",[957,1544,1545,1547,1549,1551,1553,1555,1557,1559,1561],{"class":959,"line":975},[957,1546,964],{"class":963},[957,1548,1429],{"class":967},[957,1550,1432],{"class":971},[957,1552,1435],{"class":981},[957,1554,1438],{"class":971},[957,1556,1312],{"class":963},[957,1558,1448],{"class":981},[957,1560,1102],{"class":971},[957,1562,1542],{"class":971},[957,1564,1565,1567,1569,1571],{"class":959,"line":988},[957,1566,997],{"class":963},[957,1568,1001],{"class":1000},[957,1570,1004],{"class":971},[957,1572,972],{"class":971},[957,1574,1575,1577],{"class":959,"line":994},[957,1576,1469],{"class":1012},[957,1578,985],{"class":971},[957,1580,1581,1583,1585,1588,1590],{"class":959,"line":1009},[957,1582,1021],{"class":1012},[957,1584,1024],{"class":971},[957,1586,1587],{"class":1012},"Derived::b",[957,1589,1102],{"class":971},[957,1591,1592],{"class":1105}," \u002F\u002F 确实是\n",[957,1594,1595,1597,1599,1602],{"class":959,"line":1018},[957,1596,1021],{"class":1012},[957,1598,1024],{"class":971},[957,1600,1601],{"class":1012},"Derived::d",[957,1603,985],{"class":971},[957,1605,1606],{"class":959,"line":1039},[957,1607,1042],{"class":971},[918,1609,1610,1611,1614,1615,1618,1619,1622],{},"不过除此之外，",[929,1612,1613],{},"a.b"," 也可以写成 ",[929,1616,1617],{},"a.Base::b","，但 ",[929,1620,1621],{},"a.d"," 不行：",[948,1624,1626],{"className":950,"code":1625,"language":952,"meta":953,"style":953},"struct Base { int b; };\nstruct Derived : Base { int d; };\nint main() {\n    Derived a;\n    a.Base::b; \u002F\u002F 可以这样\n\u002F\u002F  a.Base::d; \u002F\u002F 但这个不行\n}\n",[929,1627,1628,1644,1664,1674,1680,1694,1702],{"__ignoreMap":953},[957,1629,1630,1632,1634,1636,1638,1640,1642],{"class":959,"line":960},[957,1631,964],{"class":963},[957,1633,1407],{"class":967},[957,1635,1533],{"class":971},[957,1637,1312],{"class":963},[957,1639,1416],{"class":981},[957,1641,1102],{"class":971},[957,1643,1542],{"class":971},[957,1645,1646,1648,1650,1652,1654,1656,1658,1660,1662],{"class":959,"line":975},[957,1647,964],{"class":963},[957,1649,1429],{"class":967},[957,1651,1432],{"class":971},[957,1653,1435],{"class":981},[957,1655,1438],{"class":971},[957,1657,1312],{"class":963},[957,1659,1448],{"class":981},[957,1661,1102],{"class":971},[957,1663,1542],{"class":971},[957,1665,1666,1668,1670,1672],{"class":959,"line":988},[957,1667,997],{"class":963},[957,1669,1001],{"class":1000},[957,1671,1004],{"class":971},[957,1673,972],{"class":971},[957,1675,1676,1678],{"class":959,"line":994},[957,1677,1469],{"class":1012},[957,1679,985],{"class":971},[957,1681,1682,1684,1686,1689,1691],{"class":959,"line":1009},[957,1683,1021],{"class":1012},[957,1685,1024],{"class":971},[957,1687,1688],{"class":1012},"Base::b",[957,1690,1102],{"class":971},[957,1692,1693],{"class":1105}," \u002F\u002F 可以这样\n",[957,1695,1696,1699],{"class":959,"line":1018},[957,1697,1698],{"class":1105},"\u002F\u002F  a.Base::d;",[957,1700,1701],{"class":1105}," \u002F\u002F 但这个不行\n",[957,1703,1704],{"class":959,"line":1039},[957,1705,1042],{"class":971},[918,1707,1708,1709,1711,1712,1715,1716,1718,1719,1721,1722,1724,1725,1727],{},"道理就是：",[929,1710,1480],{}," 也是 ",[929,1713,1714],{},"Base"," “命名空间”下的名字，而 ",[929,1717,1714],{}," 被 ",[929,1720,1515],{}," 继承了，所以访问成员 ",[929,1723,1511],{}," 也可以通过命名空间 ",[929,1726,1714],{},"。那么说这个的意义是什么呢？当基类和派生类出现了相同名字的成员时，这个“命名空间名”就体现出作用了：",[948,1729,1731],{"className":950,"code":1730,"language":952,"meta":953,"style":953},"struct Base {\n    int x;\n};\nstruct Derived : Base {\n    int x;\n};\nint main() {\n    Derived a;\n    a.x;          \u002F\u002F 是 a.Derived::x 的省略版本\n    \u002F\u002F 但下面这两个意思不一样了！\n    a.Derived::x; \u002F\u002F 这个指第 5 行声明的那个成员\n    a.Base::x;    \u002F\u002F 这个指第 2 行声明的那个成员\n}\n",[929,1732,1733,1741,1750,1754,1767,1775,1779,1789,1795,1809,1814,1828,1843],{"__ignoreMap":953},[957,1734,1735,1737,1739],{"class":959,"line":960},[957,1736,964],{"class":963},[957,1738,1407],{"class":967},[957,1740,972],{"class":971},[957,1742,1743,1745,1748],{"class":959,"line":975},[957,1744,978],{"class":963},[957,1746,1747],{"class":981}," x",[957,1749,985],{"class":971},[957,1751,1752],{"class":959,"line":988},[957,1753,991],{"class":971},[957,1755,1756,1758,1760,1762,1764],{"class":959,"line":994},[957,1757,964],{"class":963},[957,1759,1429],{"class":967},[957,1761,1432],{"class":971},[957,1763,1435],{"class":981},[957,1765,1766],{"class":971},"{\n",[957,1768,1769,1771,1773],{"class":959,"line":1009},[957,1770,978],{"class":963},[957,1772,1747],{"class":981},[957,1774,985],{"class":971},[957,1776,1777],{"class":959,"line":1018},[957,1778,991],{"class":971},[957,1780,1781,1783,1785,1787],{"class":959,"line":1039},[957,1782,997],{"class":963},[957,1784,1001],{"class":1000},[957,1786,1004],{"class":971},[957,1788,972],{"class":971},[957,1790,1791,1793],{"class":959,"line":1265},[957,1792,1469],{"class":1012},[957,1794,985],{"class":971},[957,1796,1797,1799,1801,1804,1806],{"class":959,"line":1283},[957,1798,1021],{"class":1012},[957,1800,1024],{"class":971},[957,1802,1803],{"class":1012},"x",[957,1805,1102],{"class":971},[957,1807,1808],{"class":1105},"          \u002F\u002F 是 a.Derived::x 的省略版本\n",[957,1810,1811],{"class":959,"line":1488},[957,1812,1813],{"class":1105},"    \u002F\u002F 但下面这两个意思不一样了！\n",[957,1815,1816,1818,1820,1823,1825],{"class":959,"line":1503},[957,1817,1021],{"class":1012},[957,1819,1024],{"class":971},[957,1821,1822],{"class":1012},"Derived::x",[957,1824,1102],{"class":971},[957,1826,1827],{"class":1105}," \u002F\u002F 这个指第 5 行声明的那个成员\n",[957,1829,1831,1833,1835,1838,1840],{"class":959,"line":1830},12,[957,1832,1021],{"class":1012},[957,1834,1024],{"class":971},[957,1836,1837],{"class":1012},"Base::x",[957,1839,1102],{"class":971},[957,1841,1842],{"class":1105},"    \u002F\u002F 这个指第 2 行声明的那个成员\n",[957,1844,1846],{"class":959,"line":1845},13,[957,1847,1042],{"class":971},[918,1849,1850,1851,1853,1854,1856,1857,1861,1862,1864],{},"注意到这里 ",[929,1852,1515],{}," 类声明了一个和基类成员相同的名字 ",[929,1855,1803],{},"。那么此时会发生类似",[1511,1858,1860],{"href":1859},"\u002Fch02\u002Fpart3\u002Fscope#%E5%90%8D%E5%AD%97%E7%9A%84%E9%9A%90%E8%97%8F","名字隐藏","的效果——原先的 ",[929,1863,1822],{}," 不再是从基类继承得来的，而是派生类重新声明的这个。",[918,1866,1867,1868,1870,1871,1873,1874,1877,1878,1880,1881,1884,1885,1888,1889,1291],{},"这个时候，",[929,1869,1822],{}," 的含义被重新定义了，但 ",[929,1872,1837],{}," 的含义却没有。所以，这时访问 ",[929,1875,1876],{},"a.Base::x"," 就更改了“基类部分的”那个 ",[929,1879,1803],{},"，而通过 ",[929,1882,1883],{},"a.Derived::x"," 或者省略版本的 ",[929,1886,1887],{},"a.x"," 则更改的是“派生类部分的” ",[929,1890,1803],{},[918,1892,1893,1894,1898,1899,1902],{},"所以说，在派生类中使用和基类相同的成员名",[1895,1896,1897],"strong",{},"并不会覆盖基类的成员定义","，仅仅是“隐藏”了这个定义。最终，这个派生类的布局中存在两个名字相同的成员，通过 ",[929,1900,1901],{},"T::"," 的形式可以区分它们。",[922,1904,1906],{"id":1905},"类作用域下的-using-声明选读","类作用域下的 using 声明（选读）",[918,1908,1909],{},"之前我介绍过这样一种用法：",[948,1911,1913],{"className":950,"code":1912,"language":952,"meta":953,"style":953},"#include \u003Ciostream>\nusing std::cout;\nint main() {\n    cout \u003C\u003C \"Hello\" \u003C\u003C std::endl; \u002F\u002F cout 无需 std::\n}\n",[929,1914,1915,1931,1946,1956,1988],{"__ignoreMap":953},[957,1916,1917,1921,1924,1928],{"class":959,"line":960},[957,1918,1920],{"class":1919},"s7zQu","#include",[957,1922,1923],{"class":971}," \u003C",[957,1925,1927],{"class":1926},"sfazB","iostream",[957,1929,1930],{"class":971},">\n",[957,1932,1933,1936,1939,1941,1944],{"class":959,"line":975},[957,1934,1935],{"class":1033},"using",[957,1937,1938],{"class":967}," std",[957,1940,1125],{"class":971},[957,1942,1943],{"class":1012},"cout",[957,1945,985],{"class":971},[957,1947,1948,1950,1952,1954],{"class":959,"line":988},[957,1949,997],{"class":963},[957,1951,1001],{"class":1000},[957,1953,1004],{"class":971},[957,1955,972],{"class":971},[957,1957,1958,1961,1964,1967,1970,1973,1976,1978,1980,1983,1985],{"class":959,"line":994},[957,1959,1960],{"class":1012},"    cout ",[957,1962,1963],{"class":971},"\u003C\u003C",[957,1965,1966],{"class":971}," \"",[957,1968,1969],{"class":1926},"Hello",[957,1971,1972],{"class":971},"\"",[957,1974,1975],{"class":971}," \u003C\u003C",[957,1977,1938],{"class":967},[957,1979,1125],{"class":971},[957,1981,1982],{"class":1012},"endl",[957,1984,1102],{"class":971},[957,1986,1987],{"class":1105}," \u002F\u002F cout 无需 std::\n",[957,1989,1990],{"class":959,"line":1009},[957,1991,1042],{"class":971},[918,1993,1994,1995,1998,1999,2001,2002,2004],{},"通过 using 声明将命名空间 ",[929,1996,1997],{},"std"," 下的名字 ",[929,2000,1943],{}," 导出到全局命名空间。既然类的成员也可以像命名空间一样处理，所以类的成员列表中也可以使用 using 声明。但这里，它的 ",[929,2003,1935],{}," 只能从基类作用域中导出名字。",[948,2006,2008],{"className":950,"code":2007,"language":952,"meta":953,"style":953},"struct Base {\n    int mem;\n};\nstruct Derived : Base {\n    using Base::mem;\n\u002F\u002F  int mem; \u002F\u002F 相同作用域不允许重复定义\n    \u002F\u002F [...]\n};\n",[929,2009,2010,2018,2026,2030,2042,2055,2063,2068],{"__ignoreMap":953},[957,2011,2012,2014,2016],{"class":959,"line":960},[957,2013,964],{"class":963},[957,2015,1407],{"class":967},[957,2017,972],{"class":971},[957,2019,2020,2022,2024],{"class":959,"line":975},[957,2021,978],{"class":963},[957,2023,982],{"class":981},[957,2025,985],{"class":971},[957,2027,2028],{"class":959,"line":988},[957,2029,991],{"class":971},[957,2031,2032,2034,2036,2038,2040],{"class":959,"line":994},[957,2033,964],{"class":963},[957,2035,1429],{"class":967},[957,2037,1432],{"class":971},[957,2039,1435],{"class":981},[957,2041,1766],{"class":971},[957,2043,2044,2047,2049,2051,2053],{"class":959,"line":1009},[957,2045,2046],{"class":1033},"    using",[957,2048,1407],{"class":967},[957,2050,1125],{"class":971},[957,2052,935],{"class":981},[957,2054,985],{"class":971},[957,2056,2057,2060],{"class":959,"line":1018},[957,2058,2059],{"class":1105},"\u002F\u002F  int mem;",[957,2061,2062],{"class":1105}," \u002F\u002F 相同作用域不允许重复定义\n",[957,2064,2065],{"class":959,"line":1039},[957,2066,2067],{"class":1105},"    \u002F\u002F [...]\n",[957,2069,2070],{"class":959,"line":1265},[957,2071,991],{"class":971},[918,2073,2074,2075,2077,2078,2080,2081,2084],{},"然而这样做看上去并没有什么意义，只是说“手动”实现了成员的继承。它带来的最明显效果是 ",[929,2076,1519],{}," 作用域下的 ",[929,2079,935],{}," 被这个 using 声明“占用”了，不能重复定义 ",[929,2082,2083],{},"int mem;"," 了。但这种写法更有意义的点在于，它允许派生类使用基类的同名成员函数重载。",[948,2086,2088],{"className":950,"code":2087,"language":952,"meta":953,"style":953},"struct Base {\n    void f() { }\n};\nstruct Derived : Base {\n    using Base::f;\n    void f(int) { }\n};\nint main() {\n    Derived d;\n    d.f(); \u002F\u002F 如果不写 using Base::f 则报错\n}\n",[929,2089,2090,2098,2113,2117,2129,2142,2160,2164,2174,2181,2196],{"__ignoreMap":953},[957,2091,2092,2094,2096],{"class":959,"line":960},[957,2093,964],{"class":963},[957,2095,1407],{"class":967},[957,2097,972],{"class":971},[957,2099,2100,2103,2106,2108,2110],{"class":959,"line":975},[957,2101,2102],{"class":963},"    void",[957,2104,2105],{"class":1000}," f",[957,2107,1004],{"class":971},[957,2109,1533],{"class":971},[957,2111,2112],{"class":971}," }\n",[957,2114,2115],{"class":959,"line":988},[957,2116,991],{"class":971},[957,2118,2119,2121,2123,2125,2127],{"class":959,"line":994},[957,2120,964],{"class":963},[957,2122,1429],{"class":967},[957,2124,1432],{"class":971},[957,2126,1435],{"class":981},[957,2128,1766],{"class":971},[957,2130,2131,2133,2135,2137,2140],{"class":959,"line":1009},[957,2132,2046],{"class":1033},[957,2134,1407],{"class":967},[957,2136,1125],{"class":971},[957,2138,2139],{"class":981},"f",[957,2141,985],{"class":971},[957,2143,2144,2146,2148,2151,2153,2156,2158],{"class":959,"line":1018},[957,2145,2102],{"class":963},[957,2147,2105],{"class":1000},[957,2149,2150],{"class":971},"(",[957,2152,997],{"class":963},[957,2154,2155],{"class":971},")",[957,2157,1533],{"class":971},[957,2159,2112],{"class":971},[957,2161,2162],{"class":959,"line":1039},[957,2163,991],{"class":971},[957,2165,2166,2168,2170,2172],{"class":959,"line":1265},[957,2167,997],{"class":963},[957,2169,1001],{"class":1000},[957,2171,1004],{"class":971},[957,2173,972],{"class":971},[957,2175,2176,2179],{"class":959,"line":1283},[957,2177,2178],{"class":1012},"    Derived d",[957,2180,985],{"class":971},[957,2182,2183,2186,2188,2190,2193],{"class":959,"line":1488},[957,2184,2185],{"class":1012},"    d",[957,2187,1024],{"class":971},[957,2189,2139],{"class":1000},[957,2191,2192],{"class":971},"();",[957,2194,2195],{"class":1105}," \u002F\u002F 如果不写 using Base::f 则报错\n",[957,2197,2198],{"class":959,"line":1503},[957,2199,1042],{"class":971},[918,2201,2202,2203,2206,2207,2210,2211,2213,2214,2216,2217,2219,2220,2223,2224,2226,2227,2230,2231,2233,2234,2237],{},"在没有 using 声明的情况下，",[929,2204,2205],{},"d.f"," 会单纯被解析为 ",[929,2208,2209],{},"d.Derived::f","，即查找 ",[929,2212,1515],{}," 作用域下都有哪些 ",[929,2215,2139],{}," 的重载。然而，如果没有 using 声明，",[929,2218,1515],{}," 下只存在 ",[929,2221,2222],{},"void f(int);"," 一个重载，所有 ",[929,2225,1714],{}," 作用域的声明都被“隐藏”，那么 ",[929,2228,2229],{},"d.f();"," 就找不到合适的函数来调用，编译出错。但使用了 using 声明后，",[929,2232,1515],{}," 作用域下就存在了 ",[929,2235,2236],{},"void f();"," 这个声明，即让基类的重载集合注入到了派生类作用域下。",[918,2239,2240],{},"此外，这种 using 声明可将基类的保护成员导出：",[948,2242,2244],{"className":950,"code":2243,"language":952,"meta":953,"style":953},"struct Base {\nprotected:\n    int mem;\n};\nstruct Derived : Base {\npublic:\n    using Base::mem; \u002F\u002F 将基类的保护成员导出为派生类的公开成员\n};\nint main() {\n    Derived d;\n    d.mem; \u002F\u002F 如果删去 using 声明，则报错：保护成员不可在类外访问\n}\n",[929,2245,2246,2254,2262,2270,2274,2286,2293,2308,2312,2322,2328,2341],{"__ignoreMap":953},[957,2247,2248,2250,2252],{"class":959,"line":960},[957,2249,964],{"class":963},[957,2251,1407],{"class":967},[957,2253,972],{"class":971},[957,2255,2256,2259],{"class":959,"line":975},[957,2257,2258],{"class":963},"protected",[957,2260,2261],{"class":971},":\n",[957,2263,2264,2266,2268],{"class":959,"line":988},[957,2265,978],{"class":963},[957,2267,982],{"class":981},[957,2269,985],{"class":971},[957,2271,2272],{"class":959,"line":994},[957,2273,991],{"class":971},[957,2275,2276,2278,2280,2282,2284],{"class":959,"line":1009},[957,2277,964],{"class":963},[957,2279,1429],{"class":967},[957,2281,1432],{"class":971},[957,2283,1435],{"class":981},[957,2285,1766],{"class":971},[957,2287,2288,2291],{"class":959,"line":1018},[957,2289,2290],{"class":963},"public",[957,2292,2261],{"class":971},[957,2294,2295,2297,2299,2301,2303,2305],{"class":959,"line":1039},[957,2296,2046],{"class":1033},[957,2298,1407],{"class":967},[957,2300,1125],{"class":971},[957,2302,935],{"class":981},[957,2304,1102],{"class":971},[957,2306,2307],{"class":1105}," \u002F\u002F 将基类的保护成员导出为派生类的公开成员\n",[957,2309,2310],{"class":959,"line":1265},[957,2311,991],{"class":971},[957,2313,2314,2316,2318,2320],{"class":959,"line":1283},[957,2315,997],{"class":963},[957,2317,1001],{"class":1000},[957,2319,1004],{"class":971},[957,2321,972],{"class":971},[957,2323,2324,2326],{"class":959,"line":1488},[957,2325,2178],{"class":1012},[957,2327,985],{"class":971},[957,2329,2330,2332,2334,2336,2338],{"class":959,"line":1503},[957,2331,2185],{"class":1012},[957,2333,1024],{"class":971},[957,2335,935],{"class":1012},[957,2337,1102],{"class":971},[957,2339,2340],{"class":1105}," \u002F\u002F 如果删去 using 声明，则报错：保护成员不可在类外访问\n",[957,2342,2343],{"class":959,"line":1830},[957,2344,1042],{"class":971},[2346,2347,2348],"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 .sTEyZ, html code.shiki .sTEyZ{--shiki-light:#90A4AE;--shiki-default:#EEFFFF;--shiki-dark:#BABED8}html pre.shiki code .sbssI, html code.shiki .sbssI{--shiki-light:#F76D47;--shiki-default:#F78C6C;--shiki-dark:#F78C6C}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 .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 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":953,"searchDepth":960,"depth":975,"links":2350},[2351,2352,2353],{"id":924,"depth":975,"text":924},{"id":1392,"depth":975,"text":1392},{"id":1905,"depth":975,"text":1906},"md",null,{},{"icon":516},{"title":522,"description":920},"_aN2NMwkaQ6rhkQWT-EKNGOFvdOEVDXX8rXU2QZoAVQ",[2361,2362],{"title":515,"path":517,"stem":518,"description":515,"icon":516,"children":-1},{"title":526,"path":527,"stem":528,"description":526,"icon":516,"children":-1},1784618128689]