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",[936,1135,1136],{"class":946},">>",[936,1138,1117],{"class":1030},[936,1140,1120],{"class":946},[936,1142,1144],{"class":938,"line":1143},11,[936,1145,1147],{"class":1146},"sHwdD","    \u002F\u002F 定义于 \u003Ccmath> 的 std::pow 可计算 a^n 的值\n",[936,1149,1151,1154,1156,1159,1161,1164,1166,1169,1172,1174,1176,1178,1181,1184,1187,1189,1192,1194,1196,1198,1200,1203],{"class":938,"line":1150},12,[936,1152,1153],{"class":983},"    sum",[936,1155,987],{"class":946},[936,1157,1158],{"class":1043},"1",[936,1160,997],{"class":946},[936,1162,1163],{"class":1043}," 5",[936,1165,997],{"class":946},[936,1167,1168],{"class":946}," [](",[936,1170,1171],{"class":1030},"\u002F",[936,1173,990],{"class":979},[936,1175,994],{"class":993},[936,1177,1057],{"class":946},[936,1179,1180],{"class":946}," {",[936,1182,1183],{"class":942}," return",[936,1185,1186],{"class":1126}," std",[936,1188,1130],{"class":946},[936,1190,1191],{"class":983},"pow",[936,1193,987],{"class":946},[936,1195,1054],{"class":1030},[936,1197,997],{"class":946},[936,1199,1117],{"class":1030},[936,1201,1202],{"class":946},");",[936,1204,1205],{"class":946}," });\n",[936,1207,1209],{"class":938,"line":1208},13,[936,1210,1090],{"class":946},[918,1212,1213,1214,1217,1218,1220],{},"但这里就引入了上一节遗留的问题：Lambda 表达式中不能使用局部变量 ",[922,1215,1216],{},"n","。当然你可以将 ",[922,1219,1216],{}," 设置为全局变量；但这里我如果就不这样做，非要是局部变量，那该如何处理？",[918,1222,1223,1224,1227,1228,1231],{},"答案是使用",[1225,1226,802],"strong",{},"（Closure）。闭包是一个很特别的编程术语，专门指代可以读取其它函数局部变量的函数。我们要在这一节手动实现一个闭包，方法是：定义一个特别的类，以及它的 ",[922,1229,1230],{},"operator()","。",[918,1233,1234,1235,1238,1239,1241],{},"首先，定义一个类 ",[922,1236,1237],{},"MyLambda","，以及其中的一个成员数据 ",[922,1240,1216],{},"：",[927,1243,1245],{"className":929,"code":1244,"language":931,"meta":932,"style":932},"class MyLambda {\npublic:\n    int n;\n};\n",[922,1246,1247,1257,1265,1274],{"__ignoreMap":932},[936,1248,1249,1252,1255],{"class":938,"line":939},[936,1250,1251],{"class":979},"class",[936,1253,1254],{"class":1126}," MyLambda",[936,1256,1021],{"class":946},[936,1258,1259,1262],{"class":938,"line":957},[936,1260,1261],{"class":979},"public",[936,1263,1264],{"class":946},":\n",[936,1266,1267,1269,1272],{"class":938,"line":969},[936,1268,1114],{"class":979},[936,1270,1117],{"class":1271},"swJcz",[936,1273,1120],{"class":946},[936,1275,1276],{"class":938,"line":976},[936,1277,1278],{"class":946},"};\n",[918,1280,1281,1282,1284],{},"这样，我们可以初始化一个 ",[922,1283,1237],{}," 类的对象以及它的成员为用户输入的值：",[927,1286,1288],{"className":929,"code":1287,"language":931,"meta":932,"style":932},"int main() {\n    int n;\n    std::cin >> n;\n    MyLambda x{n}; \u002F\u002F 初始化成员数据 n\n}\n",[922,1289,1290,1300,1308,1322,1338],{"__ignoreMap":932},[936,1291,1292,1294,1296,1298],{"class":938,"line":939},[936,1293,990],{"class":979},[936,1295,1103],{"class":983},[936,1297,1106],{"class":946},[936,1299,1021],{"class":946},[936,1301,1302,1304,1306],{"class":938,"line":957},[936,1303,1114],{"class":979},[936,1305,1117],{"class":1030},[936,1307,1120],{"class":946},[936,1309,1310,1312,1314,1316,1318,1320],{"class":938,"line":969},[936,1311,1127],{"class":1126},[936,1313,1130],{"class":946},[936,1315,1133],{"class":1030},[936,1317,1136],{"class":946},[936,1319,1117],{"class":1030},[936,1321,1120],{"class":946},[936,1323,1324,1327,1330,1332,1335],{"class":938,"line":976},[936,1325,1326],{"class":1030},"    MyLambda x",[936,1328,1329],{"class":946},"{",[936,1331,1216],{"class":1271},[936,1333,1334],{"class":946},"};",[936,1336,1337],{"class":1146}," \u002F\u002F 初始化成员数据 n\n",[936,1339,1340],{"class":938,"line":1024},[936,1341,1090],{"class":946},[918,1343,1344,1345,1347,1348,1350,1351,1354],{},"随后，为 ",[922,1346,1237],{}," 类定义 ",[922,1349,1230],{},"。这样，",[922,1352,1353],{},"lambda"," 就可以像一个函数一样使用：",[927,1356,1358],{"className":929,"code":1357,"language":931,"meta":932,"style":932},"#include \u003Ciostream>\n#include \u003Ccmath>\n\nclass MyLambda {\npublic:\n    int n;\n    double operator()(int a) const {\n        return std::pow(a, n);\n    }\n};\n\ndouble sum(int a, int b, double (*term)(int)) {\n    return a > b ? 0.0 : term(a) + sum(a + 1, b, term);\n}\n\nint main() {\n    int n;\n    std::cin >> n;\n    MyLambda x{n};\n    sum(1, 5, x); \u002F\u002F 像函数一样使用对象 x……\n}\n",[922,1359,1360,1370,1380,1384,1392,1398,1406,1429,1450,1455,1459,1463,1500,1546,1551,1556,1567,1576,1591,1602,1625],{"__ignoreMap":932},[936,1361,1362,1364,1366,1368],{"class":938,"line":939},[936,1363,943],{"class":942},[936,1365,947],{"class":946},[936,1367,951],{"class":950},[936,1369,954],{"class":946},[936,1371,1372,1374,1376,1378],{"class":938,"line":957},[936,1373,943],{"class":942},[936,1375,947],{"class":946},[936,1377,964],{"class":950},[936,1379,954],{"class":946},[936,1381,1382],{"class":938,"line":969},[936,1383,973],{"emptyLinePlaceholder":972},[936,1385,1386,1388,1390],{"class":938,"line":976},[936,1387,1251],{"class":979},[936,1389,1254],{"class":1126},[936,1391,1021],{"class":946},[936,1393,1394,1396],{"class":938,"line":1024},[936,1395,1261],{"class":979},[936,1397,1264],{"class":946},[936,1399,1400,1402,1404],{"class":938,"line":1087},[936,1401,1114],{"class":979},[936,1403,1117],{"class":1271},[936,1405,1120],{"class":946},[936,1407,1408,1411,1414,1416,1418,1420,1422,1424,1427],{"class":938,"line":1093},[936,1409,1410],{"class":979},"    double",[936,1412,1413],{"class":1043}," operator",[936,1415,1106],{"class":1126},[936,1417,987],{"class":946},[936,1419,990],{"class":979},[936,1421,994],{"class":993},[936,1423,1057],{"class":946},[936,1425,1426],{"class":979}," const",[936,1428,1021],{"class":946},[936,1430,1431,1434,1436,1438,1440,1442,1444,1446,1448],{"class":938,"line":1098},[936,1432,1433],{"class":942},"        return",[936,1435,1186],{"class":1126},[936,1437,1130],{"class":946},[936,1439,1191],{"class":983},[936,1441,987],{"class":946},[936,1443,1054],{"class":1271},[936,1445,997],{"class":946},[936,1447,1117],{"class":1271},[936,1449,1084],{"class":946},[936,1451,1452],{"class":938,"line":1111},[936,1453,1454],{"class":946},"    }\n",[936,1456,1457],{"class":938,"line":1123},[936,1458,1278],{"class":946},[936,1460,1461],{"class":938,"line":1143},[936,1462,973],{"emptyLinePlaceholder":972},[936,1464,1465,1467,1469,1471,1473,1475,1477,1479,1481,1483,1485,1488,1491,1494,1496,1498],{"class":938,"line":1150},[936,1466,980],{"class":979},[936,1468,984],{"class":983},[936,1470,987],{"class":946},[936,1472,990],{"class":979},[936,1474,994],{"class":993},[936,1476,997],{"class":946},[936,1478,1000],{"class":979},[936,1480,1003],{"class":993},[936,1482,997],{"class":946},[936,1484,1008],{"class":979},[936,1486,1487],{"class":946}," (*",[936,1489,1490],{"class":993},"term",[936,1492,1493],{"class":946},")(",[936,1495,990],{"class":979},[936,1497,1018],{"class":946},[936,1499,1021],{"class":946},[936,1501,1502,1504,1506,1508,1510,1512,1514,1516,1518,1520,1522,1524,1526,1528,1530,1532,1534,1536,1538,1540,1542,1544],{"class":938,"line":1208},[936,1503,1027],{"class":942},[936,1505,1031],{"class":1030},[936,1507,1034],{"class":946},[936,1509,1037],{"class":1030},[936,1511,1040],{"class":946},[936,1513,1044],{"class":1043},[936,1515,1047],{"class":946},[936,1517,1011],{"class":983},[936,1519,987],{"class":946},[936,1521,1054],{"class":1030},[936,1523,1057],{"class":946},[936,1525,1060],{"class":946},[936,1527,984],{"class":983},[936,1529,987],{"class":946},[936,1531,1067],{"class":1030},[936,1533,1070],{"class":946},[936,1535,1073],{"class":1043},[936,1537,997],{"class":946},[936,1539,1003],{"class":1030},[936,1541,997],{"class":946},[936,1543,1011],{"class":1030},[936,1545,1084],{"class":946},[936,1547,1549],{"class":938,"line":1548},14,[936,1550,1090],{"class":946},[936,1552,1554],{"class":938,"line":1553},15,[936,1555,973],{"emptyLinePlaceholder":972},[936,1557,1559,1561,1563,1565],{"class":938,"line":1558},16,[936,1560,990],{"class":979},[936,1562,1103],{"class":983},[936,1564,1106],{"class":946},[936,1566,1021],{"class":946},[936,1568,1570,1572,1574],{"class":938,"line":1569},17,[936,1571,1114],{"class":979},[936,1573,1117],{"class":1030},[936,1575,1120],{"class":946},[936,1577,1579,1581,1583,1585,1587,1589],{"class":938,"line":1578},18,[936,1580,1127],{"class":1126},[936,1582,1130],{"class":946},[936,1584,1133],{"class":1030},[936,1586,1136],{"class":946},[936,1588,1117],{"class":1030},[936,1590,1120],{"class":946},[936,1592,1594,1596,1598,1600],{"class":938,"line":1593},19,[936,1595,1326],{"class":1030},[936,1597,1329],{"class":946},[936,1599,1216],{"class":1271},[936,1601,1278],{"class":946},[936,1603,1605,1607,1609,1611,1613,1615,1617,1620,1622],{"class":938,"line":1604},20,[936,1606,1153],{"class":983},[936,1608,987],{"class":946},[936,1610,1158],{"class":1043},[936,1612,997],{"class":946},[936,1614,1163],{"class":1043},[936,1616,997],{"class":946},[936,1618,1619],{"class":1030}," x",[936,1621,1202],{"class":946},[936,1623,1624],{"class":1146}," \u002F\u002F 像函数一样使用对象 x……\n",[936,1626,1628],{"class":938,"line":1627},21,[936,1629,1090],{"class":946},[918,1631,1632,1633,1636,1637,1640,1641,1644,1645,1647],{},"但可惜的是，这样编译并过不了。尽管对象 ",[922,1634,1635],{},"x"," 可以像函数一样使用，比如 ",[922,1638,1639],{},"x(a)","，但它并不能转换到 ",[922,1642,1643],{},"double(*)(int)"," 类型。只要解除这个类型限制，就可以实现所有的功能了。解除限制的方法很简单，就是让这个 ",[922,1646,1490],{}," 形参的类型变成一个模板形参：",[927,1649,1651],{"className":929,"code":1650,"language":931,"meta":932,"style":932},"template\u003Ctypename F>\ndouble sum(int a, int b, F term) {\n    return a > b ? 0.0 : term(a) + sum(a + 1, b, term);\n}\n",[922,1652,1653,1669,1697,1743],{"__ignoreMap":932},[936,1654,1655,1658,1661,1664,1667],{"class":938,"line":939},[936,1656,1657],{"class":979},"template",[936,1659,1660],{"class":946},"\u003C",[936,1662,1663],{"class":979},"typename",[936,1665,1666],{"class":1126}," F",[936,1668,954],{"class":946},[936,1670,1671,1673,1675,1677,1679,1681,1683,1685,1687,1689,1691,1693,1695],{"class":938,"line":957},[936,1672,980],{"class":979},[936,1674,984],{"class":983},[936,1676,987],{"class":946},[936,1678,990],{"class":979},[936,1680,994],{"class":993},[936,1682,997],{"class":946},[936,1684,1000],{"class":979},[936,1686,1003],{"class":993},[936,1688,997],{"class":946},[936,1690,1666],{"class":1126},[936,1692,1011],{"class":993},[936,1694,1057],{"class":946},[936,1696,1021],{"class":946},[936,1698,1699,1701,1703,1705,1707,1709,1711,1713,1715,1717,1719,1721,1723,1725,1727,1729,1731,1733,1735,1737,1739,1741],{"class":938,"line":969},[936,1700,1027],{"class":942},[936,1702,1031],{"class":1030},[936,1704,1034],{"class":946},[936,1706,1037],{"class":1030},[936,1708,1040],{"class":946},[936,1710,1044],{"class":1043},[936,1712,1047],{"class":946},[936,1714,1011],{"class":983},[936,1716,987],{"class":946},[936,1718,1054],{"class":1030},[936,1720,1057],{"class":946},[936,1722,1060],{"class":946},[936,1724,984],{"class":983},[936,1726,987],{"class":946},[936,1728,1067],{"class":1030},[936,1730,1070],{"class":946},[936,1732,1073],{"class":1043},[936,1734,997],{"class":946},[936,1736,1003],{"class":1030},[936,1738,997],{"class":946},[936,1740,1011],{"class":1030},[936,1742,1084],{"class":946},[936,1744,1745],{"class":938,"line":976},[936,1746,1090],{"class":946},[918,1748,1749,1750,1752,1753,1755,1756,1758,1759,1761,1762,1758,1764,1766,1767,1769,1770,1773],{},"将 ",[922,1751,924],{}," 改成这个样子之后，就无关乎 ",[922,1754,1490],{}," 的具体类型是什么了：如果传入的实参是 ",[922,1757,1643],{},"，那 ",[922,1760,1490],{}," 就是函数指针；如果传入的实参是刚刚的 ",[922,1763,1635],{},[922,1765,1490],{}," 就是 ",[922,1768,1237],{}," 类型。随后，只要 ",[922,1771,1772],{},"term(a)"," 是合法表达式，那编译就没有问题了。以下是完整代码：",[927,1775,1777],{"className":929,"code":1776,"language":931,"meta":932,"style":932},"#include \u003Ciostream>\n#include \u003Ccmath>\n\nclass MyLambda {\npublic:\n    int n;\n    double operator()(int a) const {\n        return std::pow(a, n);\n    }\n};\n\ntemplate\u003Ctypename F>\ndouble sum(int a, int b, F term) {\n    return a > b ? 0.0 : term(a) + sum(a + 1, b, term);\n}\n\nint main() {\n    int n;\n    std::cin >> n;\n    MyLambda x{n};\n    std::cout \u003C\u003C sum(1, 5, x) \u003C\u003C std::endl;\n}\n",[922,1778,1779,1789,1799,1803,1811,1817,1825,1845,1865,1869,1873,1877,1889,1917,1963,1967,1971,1981,1989,2003,2013,2053],{"__ignoreMap":932},[936,1780,1781,1783,1785,1787],{"class":938,"line":939},[936,1782,943],{"class":942},[936,1784,947],{"class":946},[936,1786,951],{"class":950},[936,1788,954],{"class":946},[936,1790,1791,1793,1795,1797],{"class":938,"line":957},[936,1792,943],{"class":942},[936,1794,947],{"class":946},[936,1796,964],{"class":950},[936,1798,954],{"class":946},[936,1800,1801],{"class":938,"line":969},[936,1802,973],{"emptyLinePlaceholder":972},[936,1804,1805,1807,1809],{"class":938,"line":976},[936,1806,1251],{"class":979},[936,1808,1254],{"class":1126},[936,1810,1021],{"class":946},[936,1812,1813,1815],{"class":938,"line":1024},[936,1814,1261],{"class":979},[936,1816,1264],{"class":946},[936,1818,1819,1821,1823],{"class":938,"line":1087},[936,1820,1114],{"class":979},[936,1822,1117],{"class":1271},[936,1824,1120],{"class":946},[936,1826,1827,1829,1831,1833,1835,1837,1839,1841,1843],{"class":938,"line":1093},[936,1828,1410],{"class":979},[936,1830,1413],{"class":1043},[936,1832,1106],{"class":1126},[936,1834,987],{"class":946},[936,1836,990],{"class":979},[936,1838,994],{"class":993},[936,1840,1057],{"class":946},[936,1842,1426],{"class":979},[936,1844,1021],{"class":946},[936,1846,1847,1849,1851,1853,1855,1857,1859,1861,1863],{"class":938,"line":1098},[936,1848,1433],{"class":942},[936,1850,1186],{"class":1126},[936,1852,1130],{"class":946},[936,1854,1191],{"class":983},[936,1856,987],{"class":946},[936,1858,1054],{"class":1271},[936,1860,997],{"class":946},[936,1862,1117],{"class":1271},[936,1864,1084],{"class":946},[936,1866,1867],{"class":938,"line":1111},[936,1868,1454],{"class":946},[936,1870,1871],{"class":938,"line":1123},[936,1872,1278],{"class":946},[936,1874,1875],{"class":938,"line":1143},[936,1876,973],{"emptyLinePlaceholder":972},[936,1878,1879,1881,1883,1885,1887],{"class":938,"line":1150},[936,1880,1657],{"class":979},[936,1882,1660],{"class":946},[936,1884,1663],{"class":979},[936,1886,1666],{"class":1126},[936,1888,954],{"class":946},[936,1890,1891,1893,1895,1897,1899,1901,1903,1905,1907,1909,1911,1913,1915],{"class":938,"line":1208},[936,1892,980],{"class":979},[936,1894,984],{"class":983},[936,1896,987],{"class":946},[936,1898,990],{"class":979},[936,1900,994],{"class":993},[936,1902,997],{"class":946},[936,1904,1000],{"class":979},[936,1906,1003],{"class":993},[936,1908,997],{"class":946},[936,1910,1666],{"class":1126},[936,1912,1011],{"class":993},[936,1914,1057],{"class":946},[936,1916,1021],{"class":946},[936,1918,1919,1921,1923,1925,1927,1929,1931,1933,1935,1937,1939,1941,1943,1945,1947,1949,1951,1953,1955,1957,1959,1961],{"class":938,"line":1548},[936,1920,1027],{"class":942},[936,1922,1031],{"class":1030},[936,1924,1034],{"class":946},[936,1926,1037],{"class":1030},[936,1928,1040],{"class":946},[936,1930,1044],{"class":1043},[936,1932,1047],{"class":946},[936,1934,1011],{"class":983},[936,1936,987],{"class":946},[936,1938,1054],{"class":1030},[936,1940,1057],{"class":946},[936,1942,1060],{"class":946},[936,1944,984],{"class":983},[936,1946,987],{"class":946},[936,1948,1067],{"class":1030},[936,1950,1070],{"class":946},[936,1952,1073],{"class":1043},[936,1954,997],{"class":946},[936,1956,1003],{"class":1030},[936,1958,997],{"class":946},[936,1960,1011],{"class":1030},[936,1962,1084],{"class":946},[936,1964,1965],{"class":938,"line":1553},[936,1966,1090],{"class":946},[936,1968,1969],{"class":938,"line":1558},[936,1970,973],{"emptyLinePlaceholder":972},[936,1972,1973,1975,1977,1979],{"class":938,"line":1569},[936,1974,990],{"class":979},[936,1976,1103],{"class":983},[936,1978,1106],{"class":946},[936,1980,1021],{"class":946},[936,1982,1983,1985,1987],{"class":938,"line":1578},[936,1984,1114],{"class":979},[936,1986,1117],{"class":1030},[936,1988,1120],{"class":946},[936,1990,1991,1993,1995,1997,1999,2001],{"class":938,"line":1593},[936,1992,1127],{"class":1126},[936,1994,1130],{"class":946},[936,1996,1133],{"class":1030},[936,1998,1136],{"class":946},[936,2000,1117],{"class":1030},[936,2002,1120],{"class":946},[936,2004,2005,2007,2009,2011],{"class":938,"line":1604},[936,2006,1326],{"class":1030},[936,2008,1329],{"class":946},[936,2010,1216],{"class":1271},[936,2012,1278],{"class":946},[936,2014,2015,2017,2019,2022,2025,2027,2029,2031,2033,2035,2037,2039,2041,2044,2046,2048,2051],{"class":938,"line":1627},[936,2016,1127],{"class":1126},[936,2018,1130],{"class":946},[936,2020,2021],{"class":1030},"cout ",[936,2023,2024],{"class":946},"\u003C\u003C",[936,2026,984],{"class":983},[936,2028,987],{"class":946},[936,2030,1158],{"class":1043},[936,2032,997],{"class":946},[936,2034,1163],{"class":1043},[936,2036,997],{"class":946},[936,2038,1619],{"class":1030},[936,2040,1057],{"class":946},[936,2042,2043],{"class":946}," \u003C\u003C",[936,2045,1186],{"class":1126},[936,2047,1130],{"class":946},[936,2049,2050],{"class":1030},"endl",[936,2052,1120],{"class":946},[936,2054,2056],{"class":938,"line":2055},22,[936,2057,1090],{"class":946},[918,2059,2060,2061,2063,2064,2066,2067,2070],{},"类似这份代码中的 ",[922,2062,1490],{},"，可以以 ",[922,2065,1772],{}," 的形式调用，或者说出现在函数调用运算符的左侧的对象，称为",[1225,2068,2069],{},"可调用对象","（Callable object）。常见的可调用对象有：",[2072,2073,2074,2078,2081,2084],"ul",{},[2075,2076,2077],"li",{},"函数；",[2075,2079,2080],{},"函数指针；",[2075,2082,2083],{},"可转换到函数指针的对象；",[2075,2085,2086,2087,2089],{},"重载了 ",[922,2088,1230],{}," 的对象（即“函数对象”）；Lambda 表达式。",[2091,2092,2094],"h2",{"id":2093},"带捕获的-lambda-表达式","带捕获的 Lambda 表达式",[918,2096,2097],{},"事实上，Lambda 表达式的完整版其实就是我们刚刚实现的闭包。刚刚的代码和下面的写法是一致的：",[927,2099,2101],{"className":929,"code":2100,"language":931,"meta":932,"style":932},"#include \u003Ciostream>\n#include \u003Ccmath>\n\ntemplate\u003Ctypename F>\ndouble sum(int a, int b, F term) {\n    return a > b ? 0.0 : term(a) + sum(a + 1, b, term);\n}\n\nint main() {\n    int n;\n    std::cin >> n;\n    std::cout \u003C\u003C sum(1, 5, [n](\u002Fint a) { return std::pow(a, n); }) \u003C\u003C std::endl;\n}\n",[922,2102,2103,2113,2123,2127,2139,2167,2213,2217,2221,2231,2239,2253,2324],{"__ignoreMap":932},[936,2104,2105,2107,2109,2111],{"class":938,"line":939},[936,2106,943],{"class":942},[936,2108,947],{"class":946},[936,2110,951],{"class":950},[936,2112,954],{"class":946},[936,2114,2115,2117,2119,2121],{"class":938,"line":957},[936,2116,943],{"class":942},[936,2118,947],{"class":946},[936,2120,964],{"class":950},[936,2122,954],{"class":946},[936,2124,2125],{"class":938,"line":969},[936,2126,973],{"emptyLinePlaceholder":972},[936,2128,2129,2131,2133,2135,2137],{"class":938,"line":976},[936,2130,1657],{"class":979},[936,2132,1660],{"class":946},[936,2134,1663],{"class":979},[936,2136,1666],{"class":1126},[936,2138,954],{"class":946},[936,2140,2141,2143,2145,2147,2149,2151,2153,2155,2157,2159,2161,2163,2165],{"class":938,"line":1024},[936,2142,980],{"class":979},[936,2144,984],{"class":983},[936,2146,987],{"class":946},[936,2148,990],{"class":979},[936,2150,994],{"class":993},[936,2152,997],{"class":946},[936,2154,1000],{"class":979},[936,2156,1003],{"class":993},[936,2158,997],{"class":946},[936,2160,1666],{"class":1126},[936,2162,1011],{"class":993},[936,2164,1057],{"class":946},[936,2166,1021],{"class":946},[936,2168,2169,2171,2173,2175,2177,2179,2181,2183,2185,2187,2189,2191,2193,2195,2197,2199,2201,2203,2205,2207,2209,2211],{"class":938,"line":1087},[936,2170,1027],{"class":942},[936,2172,1031],{"class":1030},[936,2174,1034],{"class":946},[936,2176,1037],{"class":1030},[936,2178,1040],{"class":946},[936,2180,1044],{"class":1043},[936,2182,1047],{"class":946},[936,2184,1011],{"class":983},[936,2186,987],{"class":946},[936,2188,1054],{"class":1030},[936,2190,1057],{"class":946},[936,2192,1060],{"class":946},[936,2194,984],{"class":983},[936,2196,987],{"class":946},[936,2198,1067],{"class":1030},[936,2200,1070],{"class":946},[936,2202,1073],{"class":1043},[936,2204,997],{"class":946},[936,2206,1003],{"class":1030},[936,2208,997],{"class":946},[936,2210,1011],{"class":1030},[936,2212,1084],{"class":946},[936,2214,2215],{"class":938,"line":1093},[936,2216,1090],{"class":946},[936,2218,2219],{"class":938,"line":1098},[936,2220,973],{"emptyLinePlaceholder":972},[936,2222,2223,2225,2227,2229],{"class":938,"line":1111},[936,2224,990],{"class":979},[936,2226,1103],{"class":983},[936,2228,1106],{"class":946},[936,2230,1021],{"class":946},[936,2232,2233,2235,2237],{"class":938,"line":1123},[936,2234,1114],{"class":979},[936,2236,1117],{"class":1030},[936,2238,1120],{"class":946},[936,2240,2241,2243,2245,2247,2249,2251],{"class":938,"line":1143},[936,2242,1127],{"class":1126},[936,2244,1130],{"class":946},[936,2246,1133],{"class":1030},[936,2248,1136],{"class":946},[936,2250,1117],{"class":1030},[936,2252,1120],{"class":946},[936,2254,2255,2257,2259,2261,2263,2265,2267,2269,2271,2273,2275,2278,2280,2283,2285,2287,2289,2291,2293,2295,2297,2299,2301,2303,2305,2307,2309,2311,2314,2316,2318,2320,2322],{"class":938,"line":1150},[936,2256,1127],{"class":1126},[936,2258,1130],{"class":946},[936,2260,2021],{"class":1030},[936,2262,2024],{"class":946},[936,2264,984],{"class":983},[936,2266,987],{"class":946},[936,2268,1158],{"class":1043},[936,2270,997],{"class":946},[936,2272,1163],{"class":1043},[936,2274,997],{"class":946},[936,2276,2277],{"class":946}," [",[936,2279,1216],{"class":993},[936,2281,2282],{"class":946},"](",[936,2284,1171],{"class":1030},[936,2286,990],{"class":979},[936,2288,994],{"class":993},[936,2290,1057],{"class":946},[936,2292,1180],{"class":946},[936,2294,1183],{"class":942},[936,2296,1186],{"class":1126},[936,2298,1130],{"class":946},[936,2300,1191],{"class":983},[936,2302,987],{"class":946},[936,2304,1054],{"class":1030},[936,2306,997],{"class":946},[936,2308,1117],{"class":1030},[936,2310,1202],{"class":946},[936,2312,2313],{"class":946}," })",[936,2315,2043],{"class":946},[936,2317,1186],{"class":1126},[936,2319,1130],{"class":946},[936,2321,2050],{"class":1030},[936,2323,1120],{"class":946},[936,2325,2326],{"class":938,"line":1208},[936,2327,1090],{"class":946},[918,2329,2330,2331,2334,2335,2337,2338,2341,2342,2344,2345,2347,2348,2351,2352,2354,2355,2357],{},"注意其中的 ",[922,2332,2333],{},"[n](\u002Fint a) { return std::pow(a, n); }","。这是一个 Lambda 表达式，但与之前不同的是，它开头的中括号内给出了额外的 ",[922,2336,1216],{}," 字样。这个中括号是 Lambda 的",[1225,2339,2340],{},"捕获","（Capture）语法。如果你想要在 Lambda 表达式中使用一些局部变量，则需要将它的名字放在捕获里。比如这个 Lambda 表达式中使用了局部变量 ",[922,2343,1216],{},"，所以我要把 ",[922,2346,1216],{}," 放在捕获的中括号里。",[1225,2349,2350],{},"Lambda 表达式实际上就是一个匿名类的对象","，类似我们之前的 ",[922,2353,1237],{}," 的实现。它提供了 ",[922,2356,1230],{}," 以像函数一样使用这个对象。如果存在捕获，则将这些捕获定义为类的成员，并用局部变量的值初始化它们。",[918,2359,2360],{},"Lambda 表达式具体的捕获语法比较复杂，我将这些细节问题放到了下一节。",[2362,2363,2364],"style",{},"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 .sMK4o, html code.shiki .sMK4o{--shiki-light:#39ADB5;--shiki-default:#89DDFF;--shiki-dark:#89DDFF}html pre.shiki code .sfazB, html code.shiki .sfazB{--shiki-light:#91B859;--shiki-default:#C3E88D;--shiki-dark:#C3E88D}html pre.shiki code .spNyl, html code.shiki .spNyl{--shiki-light:#9C3EDA;--shiki-default:#C792EA;--shiki-dark:#C792EA}html pre.shiki code .s2Zo4, html code.shiki .s2Zo4{--shiki-light:#6182B8;--shiki-default:#82AAFF;--shiki-dark:#82AAFF}html pre.shiki code .sHdIc, html code.shiki .sHdIc{--shiki-light:#90A4AE;--shiki-light-font-style:italic;--shiki-default:#EEFFFF;--shiki-default-font-style:italic;--shiki-dark:#BABED8;--shiki-dark-font-style:italic}html pre.shiki code .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 pre.shiki code .sBMFI, html code.shiki .sBMFI{--shiki-light:#E2931D;--shiki-default:#FFCB6B;--shiki-dark:#FFCB6B}html pre.shiki code .sHwdD, html code.shiki .sHwdD{--shiki-light:#90A4AE;--shiki-light-font-style:italic;--shiki-default:#546E7A;--shiki-default-font-style:italic;--shiki-dark:#676E95;--shiki-dark-font-style:italic}html .light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: 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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 .swJcz, html code.shiki .swJcz{--shiki-light:#E53935;--shiki-default:#F07178;--shiki-dark:#F07178}",{"title":932,"searchDepth":939,"depth":957,"links":2366},[2367],{"id":2093,"depth":957,"text":2094},"md",null,{},{"icon":796},{"title":802,"description":802},"e3WCAXM6WExwQXAjXtYFvKhCrfcdjpKmoFQg8aj50zY",[2375,2376],{"title":795,"path":797,"stem":798,"description":795,"icon":796,"children":-1},{"title":806,"path":807,"stem":808,"description":806,"icon":796,"children":-1},1784618141174]