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int b, double (*term)(int)) {\n    return a > b ? 0.0 : term(a) + sum(a + 1, b, term);\n}\n\nint main() {\n    \u002F\u002F 计算 1 + 2 + ... + 5\n    cout \u003C\u003C sum(1, 5, [](\u002Fint a) -> double { return a; }) \u003C\u003C endl;\n    \u002F\u002F 计算 3^2 + 4^2 + 5^2\n    cout \u003C\u003C sum(3, 5, [](\u002Fint a) -> double { return a * a; }) \u003C\u003C endl;\n    \u002F\u002F 计算 1\u002F(1^2) + ... + 1\u002F(100^2)\n    cout \u003C\u003C sum(1, 100, [](\u002Fint a) -> double { return 1.0 \u002F (a * a); }) \u003C\u003C endl;\n}\n",[923,1036,1037,1052,1069,1076,1083,1130,1190,1196,1201,1214,1220,1277,1283,1337,1343,1407],{"__ignoreMap":972},[953,1038,1039,1042,1045,1049],{"class":977,"line":978},[953,1040,1041],{"class":1009},"#include",[953,1043,1044],{"class":981}," 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b",[953,1110,1102],{"class":981},[953,1112,1003],{"class":989},[953,1114,1115],{"class":981}," (*",[953,1117,1118],{"class":993},"term",[953,1120,1121],{"class":981},")(",[953,1123,990],{"class":989},[953,1125,1126],{"class":981},"))",[953,1128,1129],{"class":981}," {\n",[953,1131,1133,1136,1138,1141,1144,1147,1150,1153,1156,1158,1161,1163,1166,1168,1170,1173,1176,1179,1181,1183,1185,1187],{"class":977,"line":1132},6,[953,1134,1135],{"class":1009},"    return",[953,1137,1013],{"class":985},[953,1139,1140],{"class":981},">",[953,1142,1143],{"class":985}," b ",[953,1145,1146],{"class":981},"?",[953,1148,1149],{"class":1057}," 0.0",[953,1151,1152],{"class":981}," :",[953,1154,1155],{"class":1091}," term",[953,1157,1095],{"class":981},[953,1159,1160],{"class":985},"a",[953,1162,997],{"class":981},[953,1164,1165],{"class":981}," +",[953,1167,1092],{"class":1091},[953,1169,1095],{"class":981},[953,1171,1172],{"class":985},"a ",[953,1174,1175],{"class":981},"+",[953,1177,1178],{"class":1057}," 1",[953,1180,1102],{"class":981},[953,1182,1108],{"class":985},[953,1184,1102],{"class":981},[953,1186,1155],{"class":985},[953,1188,1189],{"class":981},");\n",[953,1191,1193],{"class":977,"line":1192},7,[953,1194,1195],{"class":981},"}\n",[953,1197,1199],{"class":977,"line":1198},8,[953,1200,1075],{"emptyLinePlaceholder":1074},[953,1202,1204,1206,1209,1212],{"class":977,"line":1203},9,[953,1205,990],{"class":989},[953,1207,1208],{"class":1091}," main",[953,1210,1211],{"class":981},"()",[953,1213,1129],{"class":981},[953,1215,1217],{"class":977,"line":1216},10,[953,1218,1219],{"class":1081},"    \u002F\u002F 计算 1 + 2 + ... + 5\n",[953,1221,1223,1226,1229,1231,1233,1236,1238,1241,1243,1246,1248,1250,1252,1254,1256,1258,1260,1262,1264,1266,1269,1272,1275],{"class":977,"line":1222},11,[953,1224,1225],{"class":985},"    cout ",[953,1227,1228],{"class":981},"\u003C\u003C",[953,1230,1092],{"class":1091},[953,1232,1095],{"class":981},[953,1234,1235],{"class":1057},"1",[953,1237,1102],{"class":981},[953,1239,1240],{"class":1057}," 5",[953,1242,1102],{"class":981},[953,1244,1245],{"class":981}," [](",[953,1247,986],{"class":985},[953,1249,990],{"class":989},[953,1251,994],{"class":993},[953,1253,997],{"class":981},[953,1255,1000],{"class":981},[953,1257,1003],{"class":989},[953,1259,1006],{"class":981},[953,1261,1010],{"class":1009},[953,1263,994],{"class":985},[953,1265,1021],{"class":981},[953,1267,1268],{"class":981}," })",[953,1270,1271],{"class":981}," \u003C\u003C",[953,1273,1274],{"class":985}," endl",[953,1276,1068],{"class":981},[953,1278,1280],{"class":977,"line":1279},12,[953,1281,1282],{"class":1081},"    \u002F\u002F 计算 3^2 + 4^2 + 5^2\n",[953,1284,1286,1288,1290,1292,1294,1297,1299,1301,1303,1305,1307,1309,1311,1313,1315,1317,1319,1321,1323,1325,1327,1329,1331,1333,1335],{"class":977,"line":1285},13,[953,1287,1225],{"class":985},[953,1289,1228],{"class":981},[953,1291,1092],{"class":1091},[953,1293,1095],{"class":981},[953,1295,1296],{"class":1057},"3",[953,1298,1102],{"class":981},[953,1300,1240],{"class":1057},[953,1302,1102],{"class":981},[953,1304,1245],{"class":981},[953,1306,986],{"class":985},[953,1308,990],{"class":989},[953,1310,994],{"class":993},[953,1312,997],{"class":981},[953,1314,1000],{"class":981},[953,1316,1003],{"class":989},[953,1318,1006],{"class":981},[953,1320,1010],{"class":1009},[953,1322,1013],{"class":985},[953,1324,1016],{"class":981},[953,1326,994],{"class":985},[953,1328,1021],{"class":981},[953,1330,1268],{"class":981},[953,1332,1271],{"class":981},[953,1334,1274],{"class":985},[953,1336,1068],{"class":981},[953,1338,1340],{"class":977,"line":1339},14,[953,1341,1342],{"class":1081},"    \u002F\u002F 计算 1\u002F(1^2) + ... + 1\u002F(100^2)\n",[953,1344,1346,1348,1350,1352,1354,1356,1358,1361,1363,1365,1367,1369,1371,1373,1375,1377,1379,1381,1384,1387,1390,1392,1394,1396,1399,1401,1403,1405],{"class":977,"line":1345},15,[953,1347,1225],{"class":985},[953,1349,1228],{"class":981},[953,1351,1092],{"class":1091},[953,1353,1095],{"class":981},[953,1355,1235],{"class":1057},[953,1357,1102],{"class":981},[953,1359,1360],{"class":1057}," 100",[953,1362,1102],{"class":981},[953,1364,1245],{"class":981},[953,1366,986],{"class":985},[953,1368,990],{"class":989},[953,1370,994],{"class":993},[953,1372,997],{"class":981},[953,1374,1000],{"class":981},[953,1376,1003],{"class":989},[953,1378,1006],{"class":981},[953,1380,1010],{"class":1009},[953,1382,1383],{"class":1057}," 1.0",[953,1385,1386],{"class":981}," \u002F",[953,1388,1389],{"class":981}," (",[953,1391,1172],{"class":985},[953,1393,1016],{"class":981},[953,1395,994],{"class":985},[953,1397,1398],{"class":981},");",[953,1400,1268],{"class":981},[953,1402,1271],{"class":981},[953,1404,1274],{"class":985},[953,1406,1068],{"class":981},[953,1408,1410],{"class":977,"line":1409},16,[953,1411,1195],{"class":981},[919,1413,1414,1415,1418,1419,1421],{},"稍微展开一点原理的话，这种简单的 Lambda 表达式可以隐式转换到一个函数指针。换句话说，上面例子中出现的三个 Lambda 表达式都可以转换成 ",[923,1416,1417],{},"double (*)(int)"," 类型的指针，指向一个匿名的函数实现。从而，",[923,1420,925],{}," 调用这样的实参，完成本来的功能。",[919,1423,1424],{},"在这种简单的 Lambda 表达式中，它的表现行为和全局函数类似。Lambda 表达式的函数体中可以访问全局变量，但不能访问局部变量：因为全局函数并不能访问 main 函数中的局部变量。若要对局部变量进行访问甚至修改，则需要用到下一节的捕获语法，这里暂且不表。",[1426,1427,1428],"h2",{"id":1428},"返回值类型自动推导",[919,1430,1431,1432,1435],{},"C++11 引入 Lambda 的同时，提供了返回值类型自动推导的功能。细心的读者可能注意到我在 Lambda 表达式的语法说明中指出 ",[923,1433,1434],{},"@\"->\" 返回值类型@"," 是可选的，也就意味着：可以不提供返回值类型说明，此时编译器从 return 语句的表达式推导返回值类型是什么。",[919,1437,965],{},[967,1439,1441],{"className":969,"code":1440,"language":971,"meta":972,"style":972},"[](\u002Fint a, int b) { return a + b; }\n",[923,1442,1443],{"__ignoreMap":972},[953,1444,1445,1447,1449,1451,1453,1455,1457,1459,1461,1463,1465,1467,1469,1471,1473],{"class":977,"line":978},[953,1446,982],{"class":981},[953,1448,986],{"class":985},[953,1450,990],{"class":989},[953,1452,994],{"class":993},[953,1454,1102],{"class":981},[953,1456,1105],{"class":989},[953,1458,1108],{"class":993},[953,1460,997],{"class":981},[953,1462,1006],{"class":981},[953,1464,1010],{"class":1009},[953,1466,1013],{"class":985},[953,1468,1175],{"class":981},[953,1470,1108],{"class":985},[953,1472,1021],{"class":981},[953,1474,1024],{"class":981},[919,1476,1477,1478,930,1480,1483,1484,1486,1487,1490,1491,1493,1494,1496],{},"这个 Lambda 表达式中没有给出返回值类型，但由于 ",[923,1479,1160],{},[923,1481,1482],{},"b"," 都是 ",[923,1485,990],{}," 类型的，所以 ",[923,1488,1489],{},"a + b"," 也是 ",[923,1492,990],{}," 类型的，且它出现在 return 语句中，所以整个 Lambda 表达式的返回值类型就推导为 ",[923,1495,990],{},"。类似地：",[967,1498,1500],{"className":969,"code":1499,"language":971,"meta":972,"style":972},"[](\u002Fint a, int b) { return a \u003C b; }\n",[923,1501,1502],{"__ignoreMap":972},[953,1503,1504,1506,1508,1510,1512,1514,1516,1518,1520,1522,1524,1526,1529,1531,1533],{"class":977,"line":978},[953,1505,982],{"class":981},[953,1507,986],{"class":985},[953,1509,990],{"class":989},[953,1511,994],{"class":993},[953,1513,1102],{"class":981},[953,1515,1105],{"class":989},[953,1517,1108],{"class":993},[953,1519,997],{"class":981},[953,1521,1006],{"class":981},[953,1523,1010],{"class":1009},[953,1525,1013],{"class":985},[953,1527,1528],{"class":981},"\u003C",[953,1530,1108],{"class":985},[953,1532,1021],{"class":981},[953,1534,1024],{"class":981},[919,1536,1537,1538,1541,1542,1545,1546,1548,1549,1552,1553,1556],{},"中，",[923,1539,1540],{},"a \u003C b"," 这个表达式的类型是 ",[923,1543,1544],{},"bool","，所以整个 Lambda 表达式的返回值类型就是 ",[923,1547,1544],{},"，不需要我们显式地给出 ",[923,1550,1551],{},"-> bool"," 的说明。如果没有 return 语句或 return 语句不带表达式，则推导为返回 ",[923,1554,1555],{},"void","。",[919,1558,1559,1560,930,1563,1567],{},"这种“从表达式推导类型”的用法和我在第八章提到的 ",[923,1561,1562],{},"auto",[1160,1564,1566],{"href":1565},"\u002Fch08\u002Fstl_containers\u002Fiterator_concept#idx_%E5%8D%A0%E4%BD%8D%E7%B1%BB%E5%9E%8B%E8%AF%B4%E6%98%8E%E7%AC%A6","占位类型说明符","是相似的（其内部运作方法也是相同的）。所以在 C++14 中，返回值类型推导可以用于普通的函数，只需用 auto 来表示返回值类型即可：",[967,1569,1571],{"className":969,"code":1570,"language":971,"meta":972,"style":972},"\u002F\u002F 推导为 int add(int a, int b);\nauto add(int a, int b) {\n    return a + b;\n}\n",[923,1572,1573,1578,1601,1613],{"__ignoreMap":972},[953,1574,1575],{"class":977,"line":978},[953,1576,1577],{"class":1081},"\u002F\u002F 推导为 int add(int a, int b);\n",[953,1579,1580,1582,1585,1587,1589,1591,1593,1595,1597,1599],{"class":977,"line":1054},[953,1581,1562],{"class":989},[953,1583,1584],{"class":1091}," add",[953,1586,1095],{"class":981},[953,1588,990],{"class":989},[953,1590,994],{"class":993},[953,1592,1102],{"class":981},[953,1594,1105],{"class":989},[953,1596,1108],{"class":993},[953,1598,997],{"class":981},[953,1600,1129],{"class":981},[953,1602,1603,1605,1607,1609,1611],{"class":977,"line":1071},[953,1604,1135],{"class":1009},[953,1606,1013],{"class":985},[953,1608,1175],{"class":981},[953,1610,1108],{"class":985},[953,1612,1068],{"class":981},[953,1614,1615],{"class":977,"line":1078},[953,1616,1195],{"class":981},[919,1618,1619],{},"当然，这需要给出函数的完整定义，而且每条 return 语句的表达式类型需要一致才可以。下面是一个错误示范：",[967,1621,1623],{"className":969,"code":1622,"language":971,"meta":972,"style":972},"\u002F\u002F 编译错误：无法推导一致的返回值类型\nauto divide(int a, int b) {\n    if (b == 0) {\n        return 0; \u002F\u002F 推导为返回 int\n    } else {\n        return 1.0 * a \u002F b; \u002F\u002F 推导为返回 double\n    }\n}\n",[923,1624,1625,1630,1653,1673,1685,1695,1716,1721],{"__ignoreMap":972},[953,1626,1627],{"class":977,"line":978},[953,1628,1629],{"class":1081},"\u002F\u002F 编译错误：无法推导一致的返回值类型\n",[953,1631,1632,1634,1637,1639,1641,1643,1645,1647,1649,1651],{"class":977,"line":1054},[953,1633,1562],{"class":989},[953,1635,1636],{"class":1091}," divide",[953,1638,1095],{"class":981},[953,1640,990],{"class":989},[953,1642,994],{"class":993},[953,1644,1102],{"class":981},[953,1646,1105],{"class":989},[953,1648,1108],{"class":993},[953,1650,997],{"class":981},[953,1652,1129],{"class":981},[953,1654,1655,1658,1660,1663,1666,1669,1671],{"class":977,"line":1071},[953,1656,1657],{"class":1009},"    if",[953,1659,1389],{"class":981},[953,1661,1662],{"class":985},"b ",[953,1664,1665],{"class":981},"==",[953,1667,1668],{"class":1057}," 0",[953,1670,997],{"class":981},[953,1672,1129],{"class":981},[953,1674,1675,1678,1680,1682],{"class":977,"line":1078},[953,1676,1677],{"class":1009},"        return",[953,1679,1668],{"class":1057},[953,1681,1021],{"class":981},[953,1683,1684],{"class":1081}," \u002F\u002F 推导为返回 int\n",[953,1686,1687,1690,1693],{"class":977,"line":1085},[953,1688,1689],{"class":981},"    }",[953,1691,1692],{"class":1009}," else",[953,1694,1129],{"class":981},[953,1696,1697,1699,1701,1704,1707,1709,1711,1713],{"class":977,"line":1132},[953,1698,1677],{"class":1009},[953,1700,1383],{"class":1057},[953,1702,1703],{"class":981}," *",[953,1705,1013],{"class":1706},"swJcz",[953,1708,986],{"class":981},[953,1710,1108],{"class":1706},[953,1712,1021],{"class":981},[953,1714,1715],{"class":1081}," \u002F\u002F 推导为返回 double\n",[953,1717,1718],{"class":977,"line":1192},[953,1719,1720],{"class":981},"    }\n",[953,1722,1723],{"class":977,"line":1198},[953,1724,1195],{"class":981},[919,1726,1727,1728,1730],{},"这种推导在某些时候很有用：比如有些情形中，返回值类型的名字是不知道的；或者这个名字暂时还不能使用。那么这时不如直接用 ",[923,1729,1562],{}," 推导一下，编译就能顺利通过。",[1426,1732,1734],{"id":1733},"局部定义的函数","局部定义的“函数”",[919,1736,1737],{},"有的时候，在某个函数内经常出现大段重复的代码，那么这时就可以使用 Lambda 表达式。下面的例子中，我想输出一些字符串，但是要用引号引起它们：",[967,1739,1741],{"className":969,"code":1740,"language":971,"meta":972,"style":972},"void printSomeMsg() {\n    std::cout \u003C\u003C \"\\\"\" \u003C\u003C \"Lorem\" \u003C\u003C \"\\\"\" \u003C\u003C std::endl;\n    std::cout \u003C\u003C \"\\\"\" \u003C\u003C \"Ipsum\" \u003C\u003C \"\\\"\" \u003C\u003C std::endl;\n    std::cout \u003C\u003C \"\\\"\" \u003C\u003C \"Dolar\" \u003C\u003C \"\\\"\" \u003C\u003C std::endl;\n    \u002F\u002F [...]\n}\n",[923,1742,1743,1754,1803,1846,1889,1894],{"__ignoreMap":972},[953,1744,1745,1747,1750,1752],{"class":977,"line":978},[953,1746,1555],{"class":989},[953,1748,1749],{"class":1091}," printSomeMsg",[953,1751,1211],{"class":981},[953,1753,1129],{"class":981},[953,1755,1756,1759,1762,1765,1767,1770,1773,1775,1777,1779,1782,1784,1786,1788,1790,1792,1794,1796,1798,1801],{"class":977,"line":1054},[953,1757,1758],{"class":1064},"    std",[953,1760,1761],{"class":981},"::",[953,1763,1764],{"class":985},"cout ",[953,1766,1228],{"class":981},[953,1768,1769],{"class":981}," \"",[953,1771,1772],{"class":985},"\\\"",[953,1774,951],{"class":981},[953,1776,1271],{"class":981},[953,1778,1769],{"class":981},[953,1780,1781],{"class":1047},"Lorem",[953,1783,951],{"class":981},[953,1785,1271],{"class":981},[953,1787,1769],{"class":981},[953,1789,1772],{"class":985},[953,1791,951],{"class":981},[953,1793,1271],{"class":981},[953,1795,1065],{"class":1064},[953,1797,1761],{"class":981},[953,1799,1800],{"class":985},"endl",[953,1802,1068],{"class":981},[953,1804,1805,1807,1809,1811,1813,1815,1817,1819,1821,1823,1826,1828,1830,1832,1834,1836,1838,1840,1842,1844],{"class":977,"line":1071},[953,1806,1758],{"class":1064},[953,1808,1761],{"class":981},[953,1810,1764],{"class":985},[953,1812,1228],{"class":981},[953,1814,1769],{"class":981},[953,1816,1772],{"class":985},[953,1818,951],{"class":981},[953,1820,1271],{"class":981},[953,1822,1769],{"class":981},[953,1824,1825],{"class":1047},"Ipsum",[953,1827,951],{"class":981},[953,1829,1271],{"class":981},[953,1831,1769],{"class":981},[953,1833,1772],{"class":985},[953,1835,951],{"class":981},[953,1837,1271],{"class":981},[953,1839,1065],{"class":1064},[953,1841,1761],{"class":981},[953,1843,1800],{"class":985},[953,1845,1068],{"class":981},[953,1847,1848,1850,1852,1854,1856,1858,1860,1862,1864,1866,1869,1871,1873,1875,1877,1879,1881,1883,1885,1887],{"class":977,"line":1078},[953,1849,1758],{"class":1064},[953,1851,1761],{"class":981},[953,1853,1764],{"class":985},[953,1855,1228],{"class":981},[953,1857,1769],{"class":981},[953,1859,1772],{"class":985},[953,1861,951],{"class":981},[953,1863,1271],{"class":981},[953,1865,1769],{"class":981},[953,1867,1868],{"class":1047},"Dolar",[953,1870,951],{"class":981},[953,1872,1271],{"class":981},[953,1874,1769],{"class":981},[953,1876,1772],{"class":985},[953,1878,951],{"class":981},[953,1880,1271],{"class":981},[953,1882,1065],{"class":1064},[953,1884,1761],{"class":981},[953,1886,1800],{"class":985},[953,1888,1068],{"class":981},[953,1890,1891],{"class":977,"line":1085},[953,1892,1893],{"class":1081},"    \u002F\u002F [...]\n",[953,1895,1896],{"class":977,"line":1132},[953,1897,1195],{"class":981},[919,1899,1900],{},"为了减少重复代码，我希望将“输出引号引起的一句话”抽象为一个函数。但我又不想“污染”全局命名空间，因此我可以定义一个局部的 Lambda 表达式：",[967,1902,1904],{"className":969,"code":1903,"language":971,"meta":972,"style":972},"void printSomeMsg() {\n    \u002F* ??? *\u002F print = [](\u002Fconst std::string& s) {\n        std::cout \u003C\u003C \"\\\"\" \u003C\u003C s \u003C\u003C \"\\\"\" \u003C\u003C std::endl;\n    };\n    print(\"Lorem\");\n    print(\"Ipsum\");\n    print(\"Dolar\");\n    \u002F\u002F [...]\n}\n",[923,1905,1906,1916,1951,1991,1996,2011,2025,2039,2043],{"__ignoreMap":972},[953,1907,1908,1910,1912,1914],{"class":977,"line":978},[953,1909,1555],{"class":989},[953,1911,1749],{"class":1091},[953,1913,1211],{"class":981},[953,1915,1129],{"class":981},[953,1917,1918,1921,1924,1927,1929,1931,1934,1936,1938,1941,1944,1947,1949],{"class":977,"line":1054},[953,1919,1920],{"class":1081},"    \u002F* ??? *\u002F",[953,1922,1923],{"class":985}," print ",[953,1925,1926],{"class":981},"=",[953,1928,1245],{"class":981},[953,1930,986],{"class":985},[953,1932,1933],{"class":989},"const",[953,1935,1065],{"class":1064},[953,1937,1761],{"class":981},[953,1939,1940],{"class":1064},"string",[953,1942,1943],{"class":989},"&",[953,1945,1946],{"class":993}," s",[953,1948,997],{"class":981},[953,1950,1129],{"class":981},[953,1952,1953,1956,1958,1960,1962,1964,1966,1968,1970,1973,1975,1977,1979,1981,1983,1985,1987,1989],{"class":977,"line":1071},[953,1954,1955],{"class":1064},"        std",[953,1957,1761],{"class":981},[953,1959,1764],{"class":985},[953,1961,1228],{"class":981},[953,1963,1769],{"class":981},[953,1965,1772],{"class":985},[953,1967,951],{"class":981},[953,1969,1271],{"class":981},[953,1971,1972],{"class":985}," s ",[953,1974,1228],{"class":981},[953,1976,1769],{"class":981},[953,1978,1772],{"class":985},[953,1980,951],{"class":981},[953,1982,1271],{"class":981},[953,1984,1065],{"class":1064},[953,1986,1761],{"class":981},[953,1988,1800],{"class":985},[953,1990,1068],{"class":981},[953,1992,1993],{"class":977,"line":1078},[953,1994,1995],{"class":981},"    };\n",[953,1997,1998,2001,2003,2005,2007,2009],{"class":977,"line":1085},[953,1999,2000],{"class":1091},"    print",[953,2002,1095],{"class":981},[953,2004,951],{"class":981},[953,2006,1781],{"class":1047},[953,2008,951],{"class":981},[953,2010,1189],{"class":981},[953,2012,2013,2015,2017,2019,2021,2023],{"class":977,"line":1132},[953,2014,2000],{"class":1091},[953,2016,1095],{"class":981},[953,2018,951],{"class":981},[953,2020,1825],{"class":1047},[953,2022,951],{"class":981},[953,2024,1189],{"class":981},[953,2026,2027,2029,2031,2033,2035,2037],{"class":977,"line":1192},[953,2028,2000],{"class":1091},[953,2030,1095],{"class":981},[953,2032,951],{"class":981},[953,2034,1868],{"class":1047},[953,2036,951],{"class":981},[953,2038,1189],{"class":981},[953,2040,2041],{"class":977,"line":1198},[953,2042,1893],{"class":1081},[953,2044,2045],{"class":977,"line":1203},[953,2046,1195],{"class":981},[2048,2049,2050],"blockquote",{},[919,2051,2052],{},"我这里在本书首次使用了复制初始化器而非大括号初始化器。因为对于类似 Lambda 表达式这种长长的初始化值，大括号初始化器的可读性远低于复制初始化器。",[919,2054,2055,2056,2059],{},"之前提到过，Lambda 表达式可以转换为函数指针，所以刚才代码中的 ",[923,2057,2058],{},"???"," 可以写成一个函数指针类型：",[967,2061,2063],{"className":969,"code":2062,"language":971,"meta":972,"style":972},"void (*print)(const std::string& s) = [](\u002Fconst std::string& s) {\n    \u002F\u002F [...]\n}\n",[923,2064,2065,2113,2117],{"__ignoreMap":972},[953,2066,2067,2069,2071,2074,2076,2078,2080,2082,2084,2086,2088,2090,2093,2095,2097,2099,2101,2103,2105,2107,2109,2111],{"class":977,"line":978},[953,2068,1555],{"class":989},[953,2070,1115],{"class":981},[953,2072,2073],{"class":985},"print",[953,2075,1121],{"class":981},[953,2077,1933],{"class":989},[953,2079,1065],{"class":1064},[953,2081,1761],{"class":981},[953,2083,1940],{"class":1064},[953,2085,1943],{"class":989},[953,2087,1946],{"class":993},[953,2089,997],{"class":981},[953,2091,2092],{"class":981}," =",[953,2094,1245],{"class":981},[953,2096,986],{"class":985},[953,2098,1933],{"class":989},[953,2100,1065],{"class":1064},[953,2102,1761],{"class":981},[953,2104,1940],{"class":1064},[953,2106,1943],{"class":989},[953,2108,1946],{"class":993},[953,2110,997],{"class":981},[953,2112,1129],{"class":981},[953,2114,2115],{"class":977,"line":1054},[953,2116,1893],{"class":1081},[953,2118,2119],{"class":977,"line":1071},[953,2120,1195],{"class":981},[919,2122,2123,2124,2126],{},"但这样很麻烦；此时可以直接用 ",[923,2125,1562],{}," 占位类型说明符:",[967,2128,2130],{"className":969,"code":2129,"language":971,"meta":972,"style":972},"#include \u003Ciostream>\n#include \u003Cstring>\nvoid printSomeMsg() {\n    auto print = [](\u002Fconst std::string& s) {\n        std::cout \u003C\u003C \"\\\"\" \u003C\u003C s \u003C\u003C \"\\\"\" \u003C\u003C std::endl;\n    };\n    print(\"Lorem\");\n    print(\"Ipsum\");\n    print(\"Dolar\");\n    \u002F\u002F [...]\n}\nint main() {\n    printSomeMsg();\n}\n",[923,2131,2132,2142,2152,2162,2191,2229,2233,2247,2261,2275,2279,2283,2293,2301],{"__ignoreMap":972},[953,2133,2134,2136,2138,2140],{"class":977,"line":978},[953,2135,1041],{"class":1009},[953,2137,1044],{"class":981},[953,2139,1048],{"class":1047},[953,2141,1051],{"class":981},[953,2143,2144,2146,2148,2150],{"class":977,"line":1054},[953,2145,1041],{"class":1009},[953,2147,1044],{"class":981},[953,2149,1940],{"class":1047},[953,2151,1051],{"class":981},[953,2153,2154,2156,2158,2160],{"class":977,"line":1071},[953,2155,1555],{"class":989},[953,2157,1749],{"class":1091},[953,2159,1211],{"class":981},[953,2161,1129],{"class":981},[953,2163,2164,2167,2169,2171,2173,2175,2177,2179,2181,2183,2185,2187,2189],{"class":977,"line":1078},[953,2165,2166],{"class":989},"    auto",[953,2168,1923],{"class":985},[953,2170,1926],{"class":981},[953,2172,1245],{"class":981},[953,2174,986],{"class":985},[953,2176,1933],{"class":989},[953,2178,1065],{"class":1064},[953,2180,1761],{"class":981},[953,2182,1940],{"class":1064},[953,2184,1943],{"class":989},[953,2186,1946],{"class":993},[953,2188,997],{"class":981},[953,2190,1129],{"class":981},[953,2192,2193,2195,2197,2199,2201,2203,2205,2207,2209,2211,2213,2215,2217,2219,2221,2223,2225,2227],{"class":977,"line":1085},[953,2194,1955],{"class":1064},[953,2196,1761],{"class":981},[953,2198,1764],{"class":985},[953,2200,1228],{"class":981},[953,2202,1769],{"class":981},[953,2204,1772],{"class":985},[953,2206,951],{"class":981},[953,2208,1271],{"class":981},[953,2210,1972],{"class":985},[953,2212,1228],{"class":981},[953,2214,1769],{"class":981},[953,2216,1772],{"class":985},[953,2218,951],{"class":981},[953,2220,1271],{"class":981},[953,2222,1065],{"class":1064},[953,2224,1761],{"class":981},[953,2226,1800],{"class":985},[953,2228,1068],{"class":981},[953,2230,2231],{"class":977,"line":1132},[953,2232,1995],{"class":981},[953,2234,2235,2237,2239,2241,2243,2245],{"class":977,"line":1192},[953,2236,2000],{"class":1091},[953,2238,1095],{"class":981},[953,2240,951],{"class":981},[953,2242,1781],{"class":1047},[953,2244,951],{"class":981},[953,2246,1189],{"class":981},[953,2248,2249,2251,2253,2255,2257,2259],{"class":977,"line":1198},[953,2250,2000],{"class":1091},[953,2252,1095],{"class":981},[953,2254,951],{"class":981},[953,2256,1825],{"class":1047},[953,2258,951],{"class":981},[953,2260,1189],{"class":981},[953,2262,2263,2265,2267,2269,2271,2273],{"class":977,"line":1203},[953,2264,2000],{"class":1091},[953,2266,1095],{"class":981},[953,2268,951],{"class":981},[953,2270,1868],{"class":1047},[953,2272,951],{"class":981},[953,2274,1189],{"class":981},[953,2276,2277],{"class":977,"line":1216},[953,2278,1893],{"class":1081},[953,2280,2281],{"class":977,"line":1222},[953,2282,1195],{"class":981},[953,2284,2285,2287,2289,2291],{"class":977,"line":1279},[953,2286,990],{"class":989},[953,2288,1208],{"class":1091},[953,2290,1211],{"class":981},[953,2292,1129],{"class":981},[953,2294,2295,2298],{"class":977,"line":1285},[953,2296,2297],{"class":1091},"    printSomeMsg",[953,2299,2300],{"class":981},"();\n",[953,2302,2303],{"class":977,"line":1339},[953,2304,1195],{"class":981},[2048,2306,2307],{},[919,2308,2309,2310,2312,2313,2316],{},"这里 ",[923,2311,1562],{}," 推导得到的并不是 ",[923,2314,2315],{},"void(*)(const std::string&)"," 类型，而是 Lambda 表达式本身的类型（它和函数指针类型之间需要一次隐式转换）。Lambda 表达式本身的类型会在下一节展开讲解。",[2318,2319,2320],"style",{},"html pre.shiki code .sMK4o, html code.shiki .sMK4o{--shiki-light:#39ADB5;--shiki-default:#89DDFF;--shiki-dark:#89DDFF}html pre.shiki code .sTEyZ, html code.shiki .sTEyZ{--shiki-light:#90A4AE;--shiki-default:#EEFFFF;--shiki-dark:#BABED8}html pre.shiki code .spNyl, html code.shiki .spNyl{--shiki-light:#9C3EDA;--shiki-default:#C792EA;--shiki-dark:#C792EA}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 .s7zQu, html code.shiki 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