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static_cast\u003CT&&>(temp);\n}\n",[919,1133,1134,1146,1172,1192,1208,1224],{"__ignoreMap":933},[937,1135,1136,1138,1140,1142,1144],{"class":939,"line":940},[937,1137,944],{"class":943},[937,1139,948],{"class":947},[937,1141,951],{"class":943},[937,1143,955],{"class":954},[937,1145,958],{"class":947},[937,1147,1148,1150,1152,1154,1156,1158,1160,1162,1164,1166,1168,1170],{"class":939,"line":961},[937,1149,964],{"class":943},[937,1151,968],{"class":967},[937,1153,971],{"class":947},[937,1155,974],{"class":954},[937,1157,977],{"class":943},[937,1159,981],{"class":980},[937,1161,984],{"class":947},[937,1163,955],{"class":954},[937,1165,977],{"class":943},[937,1167,991],{"class":980},[937,1169,994],{"class":947},[937,1171,997],{"class":947},[937,1173,1174,1177,1179,1182,1184,1187,1189],{"class":939,"line":1000},[937,1175,1176],{"class":1003},"    T temp ",[937,1178,1023],{"class":947},[937,1180,1181],{"class":947}," static_cast\u003C",[937,1183,974],{"class":1003},[937,1185,1186],{"class":947},"&&>(",[937,1188,1011],{"class":1003},[937,1190,1191],{"class":947},");\n",[937,1193,1194,1196,1198,1200,1202,1204,1206],{"class":939,"line":1017},[937,1195,1020],{"class":1003},[937,1197,1023],{"class":947},[937,1199,1181],{"class":947},[937,1201,974],{"class":1003},[937,1203,1186],{"class":947},[937,1205,1056],{"class":1003},[937,1207,1191],{"class":947},[937,1209,1210,1212,1214,1216,1218,1220,1222],{"class":939,"line":1031},[937,1211,1034],{"class":1003},[937,1213,1023],{"class":947},[937,1215,1181],{"class":947},[937,1217,974],{"class":1003},[937,1219,1186],{"class":947},[937,1221,1063],{"class":1003},[937,1223,1191],{"class":947},[937,1225,1226],{"class":939,"line":1044},[937,1227,1047],{"class":947},[924,1229,1230,1231,1234,1235,1238,1239,1242,1243,1246,1247,1250],{},"由于 ",[919,1232,1233],{},"static_cast\u003CT&&>(a)"," 是亡值，也是右值，因此倘若移动构造 ",[919,1236,1237],{},"T::T(T&&);"," 存在，则会被优先调用（而不是调用开销更大的复制构造 ",[919,1240,1241],{},"T::T(const T&);","。类似地，",[919,1244,1245],{},"a = static_cast\u003CT&&>(b)"," 会优先调用 ",[919,1248,1249],{},"T& T::operator=(T&&);","，以避免复制。",[924,1252,1253,1254,1256,1257,1259,1260,1264,1265,1268,1269,1272],{},"需要强调的是，当一个对象被 ",[919,1255,1109],{}," 后，意味着它不应该继续被使用。因为 ",[919,1258,1109],{}," 意味着它可能被当做右值来使用了，而这隐含的意思是它所持有的资源可能已经被“偷”走了。基本上，在设计移动构造函数和移动赋值重载时，",[1261,1262,1263],"strong",{},"只保证","被利用后的临时对象",[1261,1266,1267],{},"可重新赋值","、",[1261,1270,1271],{},"可正常析构","。此外的任何使用都应当尽量避免。",[924,1274,1275,1277,1278,1280,1281,1283],{},[919,1276,1109],{}," 这个写法太长了，标准库提供了 ",[919,1279,921],{}," 函数来简化。下面是 ",[919,1282,921],{}," 的简化定义：",[928,1285,1287],{"className":930,"code":1286,"language":932,"meta":933,"style":933},"template\u003Ctypename T>\nT&& move(T& t) {\n    return static_cast\u003CT&&>(t);\n}\n",[919,1288,1289,1301,1324,1341],{"__ignoreMap":933},[937,1290,1291,1293,1295,1297,1299],{"class":939,"line":940},[937,1292,944],{"class":943},[937,1294,948],{"class":947},[937,1296,951],{"class":943},[937,1298,955],{"class":954},[937,1300,958],{"class":947},[937,1302,1303,1305,1308,1311,1313,1315,1317,1320,1322],{"class":939,"line":961},[937,1304,974],{"class":954},[937,1306,1307],{"class":943},"&&",[937,1309,1310],{"class":967}," move",[937,1312,971],{"class":947},[937,1314,974],{"class":954},[937,1316,977],{"class":943},[937,1318,1319],{"class":980}," t",[937,1321,994],{"class":947},[937,1323,997],{"class":947},[937,1325,1326,1330,1332,1334,1336,1339],{"class":939,"line":1000},[937,1327,1329],{"class":1328},"s7zQu","    return",[937,1331,1181],{"class":947},[937,1333,974],{"class":1003},[937,1335,1186],{"class":947},[937,1337,1338],{"class":1003},"t",[937,1340,1191],{"class":947},[937,1342,1343],{"class":939,"line":1017},[937,1344,1047],{"class":947},[924,1346,1347,1348,1350,1351,1354],{},"就是字面意思上把 ",[919,1349,1109],{}," 包装起来而已。标准额外规定，返回右值引用的函数调用表达式也是亡值表达式，因此 ",[919,1352,1353],{},"std::move(...)"," 也是右值，可以在移动函数上使用。",[1356,1357,1358,1367],"blockquote",{},[924,1359,1360,1361,1363,1364,1366],{},"如上节所述，返回 T&& 不延长生存期；但 ",[919,1362,1338],{}," 是绑定到来自函数外的对象的引用，并不是函数内的临时对象，因此不会发生悬垂引用问题。该函数返回的亡值，其关联的实体就是 ",[919,1365,1338],{}," 所指代的实体。",[924,1368,1369,1370,1373],{},"这里的返回值类型实际上是 ",[919,1371,1372],{},"std::remove_reference_t\u003CT>&&","，但为了便于理解而省略。我特意指出这一点，是为了强调它不是下文所述的转发引用，只是一个普通的右值引用。",[924,1375,1376,1377,1380],{},"因此标准库中的 ",[919,1378,1379],{},"std::swap"," 也是如此实现的：",[928,1382,1384],{"className":930,"code":1383,"language":932,"meta":933,"style":933},"#include \u003Cutility> \u002F\u002F std::move 定义于此\ntemplate\u003Ctypename T>\nvoid swap(T& a, T& b) {\n    T temp = std::move(a);\n    a = std::move(b);\n    b = std::move(temp);\n}\n",[919,1385,1386,1405,1417,1443,1464,1482,1500],{"__ignoreMap":933},[937,1387,1388,1391,1394,1398,1401],{"class":939,"line":940},[937,1389,1390],{"class":1328},"#include",[937,1392,1393],{"class":947}," \u003C",[937,1395,1397],{"class":1396},"sfazB","utility",[937,1399,1400],{"class":947},">",[937,1402,1404],{"class":1403},"sHwdD"," \u002F\u002F std::move 定义于此\n",[937,1406,1407,1409,1411,1413,1415],{"class":939,"line":961},[937,1408,944],{"class":943},[937,1410,948],{"class":947},[937,1412,951],{"class":943},[937,1414,955],{"class":954},[937,1416,958],{"class":947},[937,1418,1419,1421,1423,1425,1427,1429,1431,1433,1435,1437,1439,1441],{"class":939,"line":1000},[937,1420,964],{"class":943},[937,1422,968],{"class":967},[937,1424,971],{"class":947},[937,1426,974],{"class":954},[937,1428,977],{"class":943},[937,1430,981],{"class":980},[937,1432,984],{"class":947},[937,1434,955],{"class":954},[937,1436,977],{"class":943},[937,1438,991],{"class":980},[937,1440,994],{"class":947},[937,1442,997],{"class":947},[937,1444,1445,1447,1449,1452,1455,1458,1460,1462],{"class":939,"line":1017},[937,1446,1176],{"class":1003},[937,1448,1023],{"class":947},[937,1450,1451],{"class":954}," std",[937,1453,1454],{"class":947},"::",[937,1456,1457],{"class":967},"move",[937,1459,971],{"class":947},[937,1461,1011],{"class":1003},[937,1463,1191],{"class":947},[937,1465,1466,1468,1470,1472,1474,1476,1478,1480],{"class":939,"line":1031},[937,1467,1020],{"class":1003},[937,1469,1023],{"class":947},[937,1471,1451],{"class":954},[937,1473,1454],{"class":947},[937,1475,1457],{"class":967},[937,1477,971],{"class":947},[937,1479,1056],{"class":1003},[937,1481,1191],{"class":947},[937,1483,1484,1486,1488,1490,1492,1494,1496,1498],{"class":939,"line":1044},[937,1485,1034],{"class":1003},[937,1487,1023],{"class":947},[937,1489,1451],{"class":954},[937,1491,1454],{"class":947},[937,1493,1457],{"class":967},[937,1495,971],{"class":947},[937,1497,1063],{"class":1003},[937,1499,1191],{"class":947},[937,1501,1503],{"class":939,"line":1502},7,[937,1504,1047],{"class":947},[924,1506,1507,1508,1510,1511,1514,1515,1517],{},"总结下来，如果我们确保某个对象之后不再使用，为了更可能让其所持有的资源得以复用，可以在它最后一次使用的位置加上 ",[919,1509,921],{},"，即字面意义上表明可将资源移动到有需求的地方。讲到这里，我终于可以解释左值和右值的核心理念：",[1261,1512,1513],{},"左值和右值就是为了区别一个值到底是还可以被多次使用，还是用完就扔的","。如果这个值用完一次就扔了，那纯右值天然符合这个要求（虽然用的时候需要一次临时量实质化）。如果这个值是变量之类的，那用完一次就扔明显不符合语义，所以它是左值。而 ",[919,1516,921],{}," 出来的亡值，则本来是左值，但我确实希望它用完一次就扔，那就“强制地”让他符合右值的语义，从而尽可能地节约资源。在大部分书里，称“用完就扔”这种特性为“可移动”，这是一个意思。",[924,1519,1520],{},"此外，下面这个情形是要有意避免的：",[928,1522,1524],{"className":930,"code":1523,"language":932,"meta":933,"style":933},"T getSomething() {\n    T t;\n    \u002F\u002F [...]\n    return std::move(t); \u002F\u002F 不要这样做！最好直接 return t;\n}\n",[919,1525,1526,1538,1545,1550,1570],{"__ignoreMap":933},[937,1527,1528,1530,1533,1536],{"class":939,"line":940},[937,1529,974],{"class":954},[937,1531,1532],{"class":967}," getSomething",[937,1534,1535],{"class":947},"()",[937,1537,997],{"class":947},[937,1539,1540,1543],{"class":939,"line":961},[937,1541,1542],{"class":1003},"    T t",[937,1544,1028],{"class":947},[937,1546,1547],{"class":939,"line":1000},[937,1548,1549],{"class":1403},"    \u002F\u002F [...]\n",[937,1551,1552,1554,1556,1558,1560,1562,1564,1567],{"class":939,"line":1017},[937,1553,1329],{"class":1328},[937,1555,1451],{"class":954},[937,1557,1454],{"class":947},[937,1559,1457],{"class":967},[937,1561,971],{"class":947},[937,1563,1338],{"class":1003},[937,1565,1566],{"class":947},");",[937,1568,1569],{"class":1403}," \u002F\u002F 不要这样做！最好直接 return t;\n",[937,1571,1572],{"class":939,"line":1031},[937,1573,1047],{"class":947},[924,1575,1576,1577,1579,1580,1583,1584,1586,1587,1589],{},"这是因为，整个函数返回的是 ",[919,1578,974],{}," 这个值类型而不是引用类型（为什么不能是？），而移动\u002F复制语义仅仅在绑定到引用时才会起效果，因此此处 return 语句内是左值还是右值并没有效果上的区别。但 ",[919,1581,1582],{},"std::move(t)"," 破坏了潜在的编译器优化：标准允许 return 一个左值局部变量时进行复制消除（即直接在调用表达式处构造本应在局部构造的变量 ",[919,1585,1338],{},"），但一旦转换为亡值就意味着这个潜在优化的可能被消除了。因此没有理由在 return 处使用 ",[919,1588,921],{},"。",[1591,1592,1593],"h2",{"id":1593},"转发引用",[924,1595,1596,1598,1599,1601,1602,1605],{},[1261,1597,1593],{},"（Forwarding reference）又是一个奇怪的语法。转发引用的定义就很奇怪，它是这样说的：如果 ",[919,1600,974],{}," 位于推导语境下（比如模板形参），则 ",[919,1603,1604],{},"T&&"," 称为转发引用。比如下面的代码。",[928,1607,1609],{"className":930,"code":1608,"language":932,"meta":933,"style":933},"template\u003Ctypename T>\nvoid f(T&& x) {\n    \u002F\u002F 这里的 x 就是转发引用\n}\n",[919,1610,1611,1623,1643,1648],{"__ignoreMap":933},[937,1612,1613,1615,1617,1619,1621],{"class":939,"line":940},[937,1614,944],{"class":943},[937,1616,948],{"class":947},[937,1618,951],{"class":943},[937,1620,955],{"class":954},[937,1622,958],{"class":947},[937,1624,1625,1627,1630,1632,1634,1636,1639,1641],{"class":939,"line":961},[937,1626,964],{"class":943},[937,1628,1629],{"class":967}," f",[937,1631,971],{"class":947},[937,1633,974],{"class":954},[937,1635,1307],{"class":943},[937,1637,1638],{"class":980}," x",[937,1640,994],{"class":947},[937,1642,997],{"class":947},[937,1644,1645],{"class":939,"line":1000},[937,1646,1647],{"class":1403},"    \u002F\u002F 这里的 x 就是转发引用\n",[937,1649,1650],{"class":939,"line":1017},[937,1651,1047],{"class":947},[924,1653,1654,1655,1657,1658,1660],{},"转发引用的关键点就在于“推导语境”。它的含义是：如果推导语境中，传入的实参是左值表达式，则 ",[919,1656,1604],{}," 是左值引用类型；如果传入的实参是右值表达式，则 ",[919,1659,1604],{}," 是右值引用类型。比如：",[928,1662,1664],{"className":930,"code":1663,"language":932,"meta":933,"style":933},"template\u003Ctypename T>\nvoid f(T&& x) { }\n\nint main() {\n    int i{0};\n    f(i); \u002F\u002F 实例化出 void f(int&);\n    f(0); \u002F\u002F 实例化出 void f(int&&);\n}\n",[919,1665,1666,1678,1700,1706,1718,1734,1749,1762],{"__ignoreMap":933},[937,1667,1668,1670,1672,1674,1676],{"class":939,"line":940},[937,1669,944],{"class":943},[937,1671,948],{"class":947},[937,1673,951],{"class":943},[937,1675,955],{"class":954},[937,1677,958],{"class":947},[937,1679,1680,1682,1684,1686,1688,1690,1692,1694,1697],{"class":939,"line":961},[937,1681,964],{"class":943},[937,1683,1629],{"class":967},[937,1685,971],{"class":947},[937,1687,974],{"class":954},[937,1689,1307],{"class":943},[937,1691,1638],{"class":980},[937,1693,994],{"class":947},[937,1695,1696],{"class":947}," {",[937,1698,1699],{"class":947}," }\n",[937,1701,1702],{"class":939,"line":1000},[937,1703,1705],{"emptyLinePlaceholder":1704},true,"\n",[937,1707,1708,1711,1714,1716],{"class":939,"line":1017},[937,1709,1710],{"class":943},"int",[937,1712,1713],{"class":967}," main",[937,1715,1535],{"class":947},[937,1717,997],{"class":947},[937,1719,1720,1723,1726,1728,1732],{"class":939,"line":1031},[937,1721,1722],{"class":943},"    int",[937,1724,1725],{"class":1003}," i",[937,1727,1007],{"class":947},[937,1729,1731],{"class":1730},"sbssI","0",[937,1733,1014],{"class":947},[937,1735,1736,1739,1741,1744,1746],{"class":939,"line":1044},[937,1737,1738],{"class":967},"    f",[937,1740,971],{"class":947},[937,1742,1743],{"class":1003},"i",[937,1745,1566],{"class":947},[937,1747,1748],{"class":1403}," \u002F\u002F 实例化出 void f(int&);\n",[937,1750,1751,1753,1755,1757,1759],{"class":939,"line":1502},[937,1752,1738],{"class":967},[937,1754,971],{"class":947},[937,1756,1731],{"class":1730},[937,1758,1566],{"class":947},[937,1760,1761],{"class":1403}," \u002F\u002F 实例化出 void f(int&&);\n",[937,1763,1765],{"class":939,"line":1764},8,[937,1766,1047],{"class":947},[1356,1768,1769],{},[924,1770,1771,1772,1774,1775,1778,1779,1782],{},"转发引用 ",[919,1773,1604],{}," 是第二种“左右通吃”的引用类型。第一种是第五章就介绍的 ",[919,1776,1777],{},"const T&","，由于它不可以修改引用内容，因此丧失了移动语义。除此之外还有一种是 ",[919,1780,1781],{},"*this","，但它实在太诡异以至于我不认为我能在这里讲明白。",[924,1784,1785,1786,1789,1790,1793,1794,1797,1798,1801,1802,1805,1806,1809],{},"恶心的又来了，",[1261,1787,1788],{},"所有的引用都是左值","，即便是右值引用它也是左值。为什么这样规定？因为不论左值还是右值引用，它总是可以被多次使用的。比如之前的 ",[919,1791,1792],{},"String"," 类的移动赋值，我至少就使用了两次 ",[919,1795,1796],{},"String&& assignVal","：一次取它的资源地址 ",[919,1799,1800],{},"str","，一次取它的长度 ",[919,1803,1804],{},"len","。而右值是用完就扔的，只有左值可以这样多次使用，所以应当将引用定义为左值。事实上，这种",[1261,1807,1808],{},"带变量名的对象一般都是左值","：因为变量名它既然出现，其意义就是要多次使用。",[928,1811,1813],{"className":930,"code":1812,"language":932,"meta":933,"style":933},"template\u003Ctypename T>\nvoid f(T&& x) {\n    auto copy{x}; \u002F\u002F 这里总是调用复制构造，因为 x 是左值\n}\n\nint main() {\n    String a, b;\n    f(a + b); \u002F\u002F 即便这里传入的是右值\n}\n",[919,1814,1815,1827,1845,1864,1868,1872,1882,1893,1912],{"__ignoreMap":933},[937,1816,1817,1819,1821,1823,1825],{"class":939,"line":940},[937,1818,944],{"class":943},[937,1820,948],{"class":947},[937,1822,951],{"class":943},[937,1824,955],{"class":954},[937,1826,958],{"class":947},[937,1828,1829,1831,1833,1835,1837,1839,1841,1843],{"class":939,"line":961},[937,1830,964],{"class":943},[937,1832,1629],{"class":967},[937,1834,971],{"class":947},[937,1836,974],{"class":954},[937,1838,1307],{"class":943},[937,1840,1638],{"class":980},[937,1842,994],{"class":947},[937,1844,997],{"class":947},[937,1846,1847,1850,1853,1855,1858,1861],{"class":939,"line":1000},[937,1848,1849],{"class":943},"    auto",[937,1851,1852],{"class":1003}," copy",[937,1854,1007],{"class":947},[937,1856,1857],{"class":1010},"x",[937,1859,1860],{"class":947},"};",[937,1862,1863],{"class":1403}," \u002F\u002F 这里总是调用复制构造，因为 x 是左值\n",[937,1865,1866],{"class":939,"line":1017},[937,1867,1047],{"class":947},[937,1869,1870],{"class":939,"line":1031},[937,1871,1705],{"emptyLinePlaceholder":1704},[937,1873,1874,1876,1878,1880],{"class":939,"line":1044},[937,1875,1710],{"class":943},[937,1877,1713],{"class":967},[937,1879,1535],{"class":947},[937,1881,997],{"class":947},[937,1883,1884,1887,1889,1891],{"class":939,"line":1502},[937,1885,1886],{"class":1003},"    String a",[937,1888,984],{"class":947},[937,1890,991],{"class":1003},[937,1892,1028],{"class":947},[937,1894,1895,1897,1899,1902,1905,1907,1909],{"class":939,"line":1764},[937,1896,1738],{"class":967},[937,1898,971],{"class":947},[937,1900,1901],{"class":1003},"a ",[937,1903,1904],{"class":947},"+",[937,1906,991],{"class":1003},[937,1908,1566],{"class":947},[937,1910,1911],{"class":1403}," \u002F\u002F 即便这里传入的是右值\n",[937,1913,1915],{"class":939,"line":1914},9,[937,1916,1047],{"class":947},[924,1918,1919,1920,1923,1924,1926,1927,1929],{},"那么再回头来看转发引用 ",[919,1921,1922],{},"T&& x","，会发现一些语义上的矛盾。最初设计转发引用的时候，是希望同样一份模板代码，既可以运用于左值表达式，也可以运用于右值表达式；而且希望实例化为左值引用的版本调用复制构造\u002F赋值，而实例化为右值引用的版本调用移动构造\u002F赋值。但现在一旦出现 ",[919,1925,1922],{}," 的具名引用 ",[919,1928,1857],{},"，就全变成左值了。这不好。",[924,1931,1932,1933,1936,1937,1939,1940,1942,1943,1946,1947,1949],{},"于是标准库又增加了 ",[919,1934,1935],{},"std::forward","。标准库保证，对于 ",[919,1938,1604],{}," 类型的转发引用 ",[919,1941,1857],{},"，表达式 ",[919,1944,1945],{},"std::forward\u003CT>(x)"," 的值类别与绑定到 ",[919,1948,1857],{}," 之前的值类别保持一致。",[928,1951,1953],{"className":930,"code":1952,"language":932,"meta":933,"style":933},"#include \u003Cutility> \u002F\u002F std::forward 定义于此\ntemplate\u003Ctypename T>\nvoid f(T&& x) {\n    \u002F\u002F 移动构造或者复制构造\n    auto copy = std::forward\u003CT>(x);\n}\n\nint main() {\n    String a, b;\n    f(a + b); \u002F\u002F 如果这里传入的是右值，则 copy 可能“偷”走临时对象的资源\n    f(a);     \u002F\u002F 如果这里传入的是左值，则 copy 老老实实复制\n}\n",[919,1954,1955,1968,1980,1998,2003,2030,2034,2038,2048,2058,2076,2090],{"__ignoreMap":933},[937,1956,1957,1959,1961,1963,1965],{"class":939,"line":940},[937,1958,1390],{"class":1328},[937,1960,1393],{"class":947},[937,1962,1397],{"class":1396},[937,1964,1400],{"class":947},[937,1966,1967],{"class":1403}," \u002F\u002F std::forward 定义于此\n",[937,1969,1970,1972,1974,1976,1978],{"class":939,"line":961},[937,1971,944],{"class":943},[937,1973,948],{"class":947},[937,1975,951],{"class":943},[937,1977,955],{"class":954},[937,1979,958],{"class":947},[937,1981,1982,1984,1986,1988,1990,1992,1994,1996],{"class":939,"line":1000},[937,1983,964],{"class":943},[937,1985,1629],{"class":967},[937,1987,971],{"class":947},[937,1989,974],{"class":954},[937,1991,1307],{"class":943},[937,1993,1638],{"class":980},[937,1995,994],{"class":947},[937,1997,997],{"class":947},[937,1999,2000],{"class":939,"line":1017},[937,2001,2002],{"class":1403},"    \u002F\u002F 移动构造或者复制构造\n",[937,2004,2005,2007,2010,2012,2014,2016,2019,2021,2023,2026,2028],{"class":939,"line":1031},[937,2006,1849],{"class":943},[937,2008,2009],{"class":1003}," copy ",[937,2011,1023],{"class":947},[937,2013,1451],{"class":954},[937,2015,1454],{"class":947},[937,2017,2018],{"class":967},"forward",[937,2020,948],{"class":947},[937,2022,974],{"class":954},[937,2024,2025],{"class":947},">(",[937,2027,1857],{"class":1003},[937,2029,1191],{"class":947},[937,2031,2032],{"class":939,"line":1044},[937,2033,1047],{"class":947},[937,2035,2036],{"class":939,"line":1502},[937,2037,1705],{"emptyLinePlaceholder":1704},[937,2039,2040,2042,2044,2046],{"class":939,"line":1764},[937,2041,1710],{"class":943},[937,2043,1713],{"class":967},[937,2045,1535],{"class":947},[937,2047,997],{"class":947},[937,2049,2050,2052,2054,2056],{"class":939,"line":1914},[937,2051,1886],{"class":1003},[937,2053,984],{"class":947},[937,2055,991],{"class":1003},[937,2057,1028],{"class":947},[937,2059,2061,2063,2065,2067,2069,2071,2073],{"class":939,"line":2060},10,[937,2062,1738],{"class":967},[937,2064,971],{"class":947},[937,2066,1901],{"class":1003},[937,2068,1904],{"class":947},[937,2070,991],{"class":1003},[937,2072,1566],{"class":947},[937,2074,2075],{"class":1403}," \u002F\u002F 如果这里传入的是右值，则 copy 可能“偷”走临时对象的资源\n",[937,2077,2079,2081,2083,2085,2087],{"class":939,"line":2078},11,[937,2080,1738],{"class":967},[937,2082,971],{"class":947},[937,2084,1011],{"class":1003},[937,2086,1566],{"class":947},[937,2088,2089],{"class":1403},"     \u002F\u002F 如果这里传入的是左值，则 copy 老老实实复制\n",[937,2091,2093],{"class":939,"line":2092},12,[937,2094,1047],{"class":947},[924,2096,2097,2099,2100,2102,2103,2105,2106,2108,2109,2111],{},[919,2098,1935],{}," 的实现比较复杂，这里就不讲了（其实我也讲不明白）。",[919,2101,1935],{}," 拥有一个美妙的俗名：“完美转发”（perfect forwarding），意思就是将传入转发引用之前的实参值类别“完美地”转发给内层的对应函数。你还可以将 ",[919,2104,1935],{}," 理解为“智能”的 ",[919,2107,921],{},"。因此你也要注意在 ",[919,2110,1935],{}," 一个东西之后就不能再使用它了——它的资源可能已经被移走了。",[2113,2114,2115],"style",{},"html pre.shiki code .spNyl, html code.shiki .spNyl{--shiki-light:#9C3EDA;--shiki-default:#C792EA;--shiki-dark:#C792EA}html pre.shiki code .sMK4o, html code.shiki .sMK4o{--shiki-light:#39ADB5;--shiki-default:#89DDFF;--shiki-dark:#89DDFF}html pre.shiki code 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