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rg",[953,1137,1027],{"class":963},[953,1139,1140],{"class":1049},"transform",[953,1142,1143],{"class":963},"(",[953,1145,1146],{"class":1067},"a",[953,1148,1088],{"class":963},[953,1150,1024],{"class":1017},[953,1152,1027],{"class":963},[953,1154,1155],{"class":1049},"back_inserter",[953,1157,1143],{"class":963},[953,1159,1160],{"class":1067},"b",[953,1162,1163],{"class":963},"),",[953,1165,1166],{"class":963}," [](",[953,1168,1169],{"class":1067},"\u002F",[953,1171,1046],{"class":1013},[953,1173,1175],{"class":1174},"sHdIc"," x",[953,1177,1178],{"class":963},")",[953,1180,1056],{"class":963},[953,1182,1184,1187,1190,1193,1195],{"class":955,"line":1183},11,[953,1185,1186],{"class":959},"        return",[953,1188,1189],{"class":1067}," x ",[953,1191,1192],{"class":963},"*",[953,1194,1175],{"class":1067},[953,1196,1033],{"class":963},[953,1198,1200],{"class":955,"line":1199},12,[953,1201,1202],{"class":963},"    });\n",[953,1204,1206,1209,1212,1215,1218,1221,1223,1225],{"class":955,"line":1205},13,[953,1207,1208],{"class":959},"    for",[953,1210,1211],{"class":963}," (",[953,1213,1214],{"class":1013},"auto",[953,1216,1217],{"class":1067}," i ",[953,1219,1220],{"class":963},":",[953,1222,1127],{"class":1067},[953,1224,1178],{"class":963},[953,1226,1056],{"class":963},[953,1228,1230,1233,1235,1239,1242,1244,1246,1249,1251],{"class":955,"line":1229},14,[953,1231,1232],{"class":1017},"        std",[953,1234,1027],{"class":963},[953,1236,1238],{"class":1237},"swJcz","cout ",[953,1240,1241],{"class":963},"\u003C\u003C",[953,1243,1217],{"class":1237},[953,1245,1241],{"class":963},[953,1247,1248],{"class":963}," '",[953,1250,1248],{"class":963},[953,1252,1033],{"class":963},[953,1254,1256],{"class":955,"line":1255},15,[953,1257,1258],{"class":963},"    }\n",[953,1260,1262],{"class":955,"line":1261},16,[953,1263,1264],{"class":963},"}\n",[918,1266,1267,1268,1270,1271,1273,1274,1276],{},"这里，",[928,1269,937],{}," 典型地接受三个参数：第一个是要作用的范围；第二个是目的地，最后一个是变换函数。这里的变换函数是平方 $y=x^2$，要作用的范围是向量 ",[928,1272,1146],{},"，里面存放的是 5 个整数。整个 ",[928,1275,937],{}," 会将变换函数一一地作用在范围内的每个值上，然后将返回的结果存放到目的地内。",[918,1278,1279],{},"$$\\bm a={x}\\xrightarrow{\\operatorname{transform}(f)}{f(x)}\\eqqcolon\\bm b$$",[918,1281,1282,1283,1286,1287,1289],{},"整段代码运行后，结果就是 ",[928,1284,1285],{},"1 4 9 16 25 ","，即原先 ",[928,1288,1146],{}," 里的每个元素的平方。",[918,1291,1292,1293,1296,1297,1300],{},"类似地，也有它对应的视图 ",[928,1294,1295],{},"rg::transform_view"," 和范围适配器 ",[928,1298,1299],{},"std::views::transform","。在范围适配器的语法下，刚刚的代码可以直接写成这样：",[944,1302,1304],{"className":946,"code":1303,"language":948,"meta":949,"style":949},"#include \u003Ciostream>\n#include \u003Cvector>\n#include \u003Calgorithm>\n#include \u003Cranges>\nnamespace rg = std::ranges;\n\nint main() {\n    std::vector\u003Cint> a{1, 2, 3, 4, 5};\n    for (auto i : a\n        | std::views::transform([](\u002Fint x) { return x * x; })) {\n        std::cout \u003C\u003C i \u003C\u003C ' ';\n    }\n}\n",[928,1305,1306,1316,1326,1336,1346,1362,1366,1376,1414,1429,1476,1496,1500],{"__ignoreMap":949},[953,1307,1308,1310,1312,1314],{"class":955,"line":956},[953,1309,960],{"class":959},[953,1311,964],{"class":963},[953,1313,968],{"class":967},[953,1315,971],{"class":963},[953,1317,1318,1320,1322,1324],{"class":955,"line":974},[953,1319,960],{"class":959},[953,1321,964],{"class":963},[953,1323,981],{"class":967},[953,1325,971],{"class":963},[953,1327,1328,1330,1332,1334],{"class":955,"line":986},[953,1329,960],{"class":959},[953,1331,964],{"class":963},[953,1333,993],{"class":967},[953,1335,971],{"class":963},[953,1337,1338,1340,1342,1344],{"class":955,"line":998},[953,1339,960],{"class":959},[953,1341,964],{"class":963},[953,1343,1030],{"class":967},[953,1345,971],{"class":963},[953,1347,1348,1350,1352,1354,1356,1358,1360],{"class":955,"line":1010},[953,1349,1014],{"class":1013},[953,1351,1018],{"class":1017},[953,1353,1021],{"class":963},[953,1355,1024],{"class":1017},[953,1357,1027],{"class":963},[953,1359,1030],{"class":1017},[953,1361,1033],{"class":963},[953,1363,1364],{"class":955,"line":1036},[953,1365,1040],{"emptyLinePlaceholder":1039},[953,1367,1368,1370,1372,1374],{"class":955,"line":1043},[953,1369,1046],{"class":1013},[953,1371,1050],{"class":1049},[953,1373,1053],{"class":963},[953,1375,1056],{"class":963},[953,1377,1378,1380,1382,1384,1386,1388,1390,1392,1394,1396,1398,1400,1402,1404,1406,1408,1410,1412],{"class":955,"line":1059},[953,1379,1062],{"class":1017},[953,1381,1027],{"class":963},[953,1383,981],{"class":1067},[953,1385,1070],{"class":963},[953,1387,1046],{"class":1013},[953,1389,1075],{"class":963},[953,1391,1078],{"class":1067},[953,1393,1081],{"class":963},[953,1395,1085],{"class":1084},[953,1397,1088],{"class":963},[953,1399,1091],{"class":1084},[953,1401,1088],{"class":963},[953,1403,1096],{"class":1084},[953,1405,1088],{"class":963},[953,1407,1101],{"class":1084},[953,1409,1088],{"class":963},[953,1411,1106],{"class":1084},[953,1413,1109],{"class":963},[953,1415,1416,1418,1420,1422,1424,1426],{"class":955,"line":1112},[953,1417,1208],{"class":959},[953,1419,1211],{"class":963},[953,1421,1214],{"class":1013},[953,1423,1217],{"class":1067},[953,1425,1220],{"class":963},[953,1427,1428],{"class":1067}," a\n",[953,1430,1431,1434,1436,1438,1441,1443,1445,1448,1450,1452,1454,1456,1459,1462,1464,1466,1468,1471,1474],{"class":955,"line":1132},[953,1432,1433],{"class":963},"        |",[953,1435,1024],{"class":1017},[953,1437,1027],{"class":963},[953,1439,1440],{"class":1017},"views",[953,1442,1027],{"class":963},[953,1444,1140],{"class":1049},[953,1446,1447],{"class":963},"([](",[953,1449,1169],{"class":1067},[953,1451,1046],{"class":1013},[953,1453,1175],{"class":1174},[953,1455,1178],{"class":963},[953,1457,1458],{"class":963}," {",[953,1460,1461],{"class":959}," return",[953,1463,1189],{"class":1067},[953,1465,1192],{"class":963},[953,1467,1175],{"class":1067},[953,1469,1470],{"class":963},";",[953,1472,1473],{"class":963}," }))",[953,1475,1056],{"class":963},[953,1477,1478,1480,1482,1484,1486,1488,1490,1492,1494],{"class":955,"line":1183},[953,1479,1232],{"class":1017},[953,1481,1027],{"class":963},[953,1483,1238],{"class":1237},[953,1485,1241],{"class":963},[953,1487,1217],{"class":1237},[953,1489,1241],{"class":963},[953,1491,1248],{"class":963},[953,1493,1248],{"class":963},[953,1495,1033],{"class":963},[953,1497,1498],{"class":955,"line":1199},[953,1499,1258],{"class":963},[953,1501,1502],{"class":955,"line":1205},[953,1503,1264],{"class":963},[918,1505,1506],{},"下面展示一个复杂的例子。假设有这样的需求：从输入读取若干个数；取前 5 个正数的算术平方根。这段程序可以这样写：",[944,1508,1510],{"className":946,"code":1509,"language":948,"meta":949,"style":949},"#include \u003Ciostream>\n#include \u003Calgorithm>\n#include \u003Cvector>\n#include \u003Citerator>\n#include \u003Ccmath>\nnamespace rg = std::ranges;\n\nint main() {\n    std::vector\u003Cint> a;\n    \u002F\u002F 输入\n    int x;\n    while (std::cin >> x) {\n        a.push_back(x);\n    }\n    \u002F\u002F 筛选出正数\n    std::vector\u003Cint> b;\n    rg::copy_if(a, std::back_inserter(b), [](\u002Fint x) {\n        return x > 0;\n    });\n    \u002F\u002F 取前 5 个\n    if (b.size() > 5) {\n        b.resize(5);\n    }\n    \u002F\u002F 取平方根\n    std::vector\u003Cdouble> c;\n    rg::transform(b, std::back_inserter(c), [](\u002Fint x) {\n        return std::sqrt(x);\n    });\n    \u002F\u002F 输出\n    for (auto i : c) {\n        std::cout \u003C\u003C i \u003C\u003C ' ';\n    }\n}\n",[928,1511,1512,1522,1532,1542,1552,1563,1579,1583,1593,1611,1617,1626,1650,1669,1673,1678,1696,1736,1750,1755,1761,1787,1805,1810,1816,1837,1877,1895,1900,1906,1925,1946,1951],{"__ignoreMap":949},[953,1513,1514,1516,1518,1520],{"class":955,"line":956},[953,1515,960],{"class":959},[953,1517,964],{"class":963},[953,1519,968],{"class":967},[953,1521,971],{"class":963},[953,1523,1524,1526,1528,1530],{"class":955,"line":974},[953,1525,960],{"class":959},[953,1527,964],{"class":963},[953,1529,993],{"class":967},[953,1531,971],{"class":963},[953,1533,1534,1536,1538,1540],{"class":955,"line":986},[953,1535,960],{"class":959},[953,1537,964],{"class":963},[953,1539,981],{"class":967},[953,1541,971],{"class":963},[953,1543,1544,1546,1548,1550],{"class":955,"line":998},[953,1545,960],{"class":959},[953,1547,964],{"class":963},[953,1549,1005],{"class":967},[953,1551,971],{"class":963},[953,1553,1554,1556,1558,1561],{"class":955,"line":1010},[953,1555,960],{"class":959},[953,1557,964],{"class":963},[953,1559,1560],{"class":967},"cmath",[953,1562,971],{"class":963},[953,1564,1565,1567,1569,1571,1573,1575,1577],{"class":955,"line":1036},[953,1566,1014],{"class":1013},[953,1568,1018],{"class":1017},[953,1570,1021],{"class":963},[953,1572,1024],{"class":1017},[953,1574,1027],{"class":963},[953,1576,1030],{"class":1017},[953,1578,1033],{"class":963},[953,1580,1581],{"class":955,"line":1043},[953,1582,1040],{"emptyLinePlaceholder":1039},[953,1584,1585,1587,1589,1591],{"class":955,"line":1059},[953,1586,1046],{"class":1013},[953,1588,1050],{"class":1049},[953,1590,1053],{"class":963},[953,1592,1056],{"class":963},[953,1594,1595,1597,1599,1601,1603,1605,1607,1609],{"class":955,"line":1112},[953,1596,1062],{"class":1017},[953,1598,1027],{"class":963},[953,1600,981],{"class":1067},[953,1602,1070],{"class":963},[953,1604,1046],{"class":1013},[953,1606,1075],{"class":963},[953,1608,1078],{"class":1067},[953,1610,1033],{"class":963},[953,1612,1613],{"class":955,"line":1132},[953,1614,1616],{"class":1615},"sHwdD","    \u002F\u002F 输入\n",[953,1618,1619,1622,1624],{"class":955,"line":1183},[953,1620,1621],{"class":1013},"    int",[953,1623,1175],{"class":1067},[953,1625,1033],{"class":963},[953,1627,1628,1631,1633,1636,1638,1641,1644,1646,1648],{"class":955,"line":1199},[953,1629,1630],{"class":959},"    while",[953,1632,1211],{"class":963},[953,1634,1635],{"class":1017},"std",[953,1637,1027],{"class":963},[953,1639,1640],{"class":1067},"cin ",[953,1642,1643],{"class":963},">>",[953,1645,1175],{"class":1067},[953,1647,1178],{"class":963},[953,1649,1056],{"class":963},[953,1651,1652,1655,1658,1661,1663,1666],{"class":955,"line":1205},[953,1653,1654],{"class":1067},"        a",[953,1656,1657],{"class":963},".",[953,1659,1660],{"class":1049},"push_back",[953,1662,1143],{"class":963},[953,1664,1665],{"class":1237},"x",[953,1667,1668],{"class":963},");\n",[953,1670,1671],{"class":955,"line":1229},[953,1672,1258],{"class":963},[953,1674,1675],{"class":955,"line":1255},[953,1676,1677],{"class":1615},"    \u002F\u002F 筛选出正数\n",[953,1679,1680,1682,1684,1686,1688,1690,1692,1694],{"class":955,"line":1261},[953,1681,1062],{"class":1017},[953,1683,1027],{"class":963},[953,1685,981],{"class":1067},[953,1687,1070],{"class":963},[953,1689,1046],{"class":1013},[953,1691,1075],{"class":963},[953,1693,1127],{"class":1067},[953,1695,1033],{"class":963},[953,1697,1699,1701,1703,1706,1708,1710,1712,1714,1716,1718,1720,1722,1724,1726,1728,1730,1732,1734],{"class":955,"line":1698},17,[953,1700,1135],{"class":1017},[953,1702,1027],{"class":963},[953,1704,1705],{"class":1049},"copy_if",[953,1707,1143],{"class":963},[953,1709,1146],{"class":1067},[953,1711,1088],{"class":963},[953,1713,1024],{"class":1017},[953,1715,1027],{"class":963},[953,1717,1155],{"class":1049},[953,1719,1143],{"class":963},[953,1721,1160],{"class":1067},[953,1723,1163],{"class":963},[953,1725,1166],{"class":963},[953,1727,1169],{"class":1067},[953,1729,1046],{"class":1013},[953,1731,1175],{"class":1174},[953,1733,1178],{"class":963},[953,1735,1056],{"class":963},[953,1737,1739,1741,1743,1745,1748],{"class":955,"line":1738},18,[953,1740,1186],{"class":959},[953,1742,1189],{"class":1067},[953,1744,1075],{"class":963},[953,1746,1747],{"class":1084}," 0",[953,1749,1033],{"class":963},[953,1751,1753],{"class":955,"line":1752},19,[953,1754,1202],{"class":963},[953,1756,1758],{"class":955,"line":1757},20,[953,1759,1760],{"class":1615},"    \u002F\u002F 取前 5 个\n",[953,1762,1764,1767,1769,1771,1773,1776,1778,1781,1783,1785],{"class":955,"line":1763},21,[953,1765,1766],{"class":959},"    if",[953,1768,1211],{"class":963},[953,1770,1160],{"class":1067},[953,1772,1657],{"class":963},[953,1774,1775],{"class":1049},"size",[953,1777,1053],{"class":963},[953,1779,1780],{"class":963}," >",[953,1782,1106],{"class":1084},[953,1784,1178],{"class":963},[953,1786,1056],{"class":963},[953,1788,1790,1793,1795,1798,1800,1803],{"class":955,"line":1789},22,[953,1791,1792],{"class":1067},"        b",[953,1794,1657],{"class":963},[953,1796,1797],{"class":1049},"resize",[953,1799,1143],{"class":963},[953,1801,1802],{"class":1084},"5",[953,1804,1668],{"class":963},[953,1806,1808],{"class":955,"line":1807},23,[953,1809,1258],{"class":963},[953,1811,1813],{"class":955,"line":1812},24,[953,1814,1815],{"class":1615},"    \u002F\u002F 取平方根\n",[953,1817,1819,1821,1823,1825,1827,1830,1832,1835],{"class":955,"line":1818},25,[953,1820,1062],{"class":1017},[953,1822,1027],{"class":963},[953,1824,981],{"class":1067},[953,1826,1070],{"class":963},[953,1828,1829],{"class":1013},"double",[953,1831,1075],{"class":963},[953,1833,1834],{"class":1067}," c",[953,1836,1033],{"class":963},[953,1838,1840,1842,1844,1846,1848,1850,1852,1854,1856,1858,1860,1863,1865,1867,1869,1871,1873,1875],{"class":955,"line":1839},26,[953,1841,1135],{"class":1017},[953,1843,1027],{"class":963},[953,1845,1140],{"class":1049},[953,1847,1143],{"class":963},[953,1849,1160],{"class":1067},[953,1851,1088],{"class":963},[953,1853,1024],{"class":1017},[953,1855,1027],{"class":963},[953,1857,1155],{"class":1049},[953,1859,1143],{"class":963},[953,1861,1862],{"class":1067},"c",[953,1864,1163],{"class":963},[953,1866,1166],{"class":963},[953,1868,1169],{"class":1067},[953,1870,1046],{"class":1013},[953,1872,1175],{"class":1174},[953,1874,1178],{"class":963},[953,1876,1056],{"class":963},[953,1878,1880,1882,1884,1886,1889,1891,1893],{"class":955,"line":1879},27,[953,1881,1186],{"class":959},[953,1883,1024],{"class":1017},[953,1885,1027],{"class":963},[953,1887,1888],{"class":1049},"sqrt",[953,1890,1143],{"class":963},[953,1892,1665],{"class":1067},[953,1894,1668],{"class":963},[953,1896,1898],{"class":955,"line":1897},28,[953,1899,1202],{"class":963},[953,1901,1903],{"class":955,"line":1902},29,[953,1904,1905],{"class":1615},"    \u002F\u002F 输出\n",[953,1907,1909,1911,1913,1915,1917,1919,1921,1923],{"class":955,"line":1908},30,[953,1910,1208],{"class":959},[953,1912,1211],{"class":963},[953,1914,1214],{"class":1013},[953,1916,1217],{"class":1067},[953,1918,1220],{"class":963},[953,1920,1834],{"class":1067},[953,1922,1178],{"class":963},[953,1924,1056],{"class":963},[953,1926,1928,1930,1932,1934,1936,1938,1940,1942,1944],{"class":955,"line":1927},31,[953,1929,1232],{"class":1017},[953,1931,1027],{"class":963},[953,1933,1238],{"class":1237},[953,1935,1241],{"class":963},[953,1937,1217],{"class":1237},[953,1939,1241],{"class":963},[953,1941,1248],{"class":963},[953,1943,1248],{"class":963},[953,1945,1033],{"class":963},[953,1947,1949],{"class":955,"line":1948},32,[953,1950,1258],{"class":963},[953,1952,1954],{"class":955,"line":1953},33,[953,1955,1264],{"class":963},[918,1957,1958],{},"看上去略微有些凌乱。但我们可以用范围适配器的语法极大地简化整个流程：",[944,1960,1962],{"className":946,"code":1961,"language":948,"meta":949,"style":949},"#include \u003Ciostream>\n#include \u003Calgorithm>\n#include \u003Cvector>\n#include \u003Cranges>\n#include \u003Ccmath>\nnamespace rg = std::ranges;\n\nint main() {\n    std::vector\u003Cint> a;\n    \u002F\u002F 输入\n    int x;\n    while (std::cin >> x) {\n        a.push_back(x);\n    }\n    for (auto i : a\n        | std::views::filter([](\u002Fint x) { return x > 0; })\n        | std::views::take(5)\n        | std::views::transform([](\u002Fint x) { return std::sqrt(x); })) {\n        std::cout \u003C\u003C i \u003C\u003C ' ';\n    }\n}\n",[928,1963,1964,1974,1984,1994,2004,2014,2030,2034,2044,2062,2066,2074,2094,2108,2112,2126,2166,2188,2233,2253,2257],{"__ignoreMap":949},[953,1965,1966,1968,1970,1972],{"class":955,"line":956},[953,1967,960],{"class":959},[953,1969,964],{"class":963},[953,1971,968],{"class":967},[953,1973,971],{"class":963},[953,1975,1976,1978,1980,1982],{"class":955,"line":974},[953,1977,960],{"class":959},[953,1979,964],{"class":963},[953,1981,993],{"class":967},[953,1983,971],{"class":963},[953,1985,1986,1988,1990,1992],{"class":955,"line":986},[953,1987,960],{"class":959},[953,1989,964],{"class":963},[953,1991,981],{"class":967},[953,1993,971],{"class":963},[953,1995,1996,1998,2000,2002],{"class":955,"line":998},[953,1997,960],{"class":959},[953,1999,964],{"class":963},[953,2001,1030],{"class":967},[953,2003,971],{"class":963},[953,2005,2006,2008,2010,2012],{"class":955,"line":1010},[953,2007,960],{"class":959},[953,2009,964],{"class":963},[953,2011,1560],{"class":967},[953,2013,971],{"class":963},[953,2015,2016,2018,2020,2022,2024,2026,2028],{"class":955,"line":1036},[953,2017,1014],{"class":1013},[953,2019,1018],{"class":1017},[953,2021,1021],{"class":963},[953,2023,1024],{"class":1017},[953,2025,1027],{"class":963},[953,2027,1030],{"class":1017},[953,2029,1033],{"class":963},[953,2031,2032],{"class":955,"line":1043},[953,2033,1040],{"emptyLinePlaceholder":1039},[953,2035,2036,2038,2040,2042],{"class":955,"line":1059},[953,2037,1046],{"class":1013},[953,2039,1050],{"class":1049},[953,2041,1053],{"class":963},[953,2043,1056],{"class":963},[953,2045,2046,2048,2050,2052,2054,2056,2058,2060],{"class":955,"line":1112},[953,2047,1062],{"class":1017},[953,2049,1027],{"class":963},[953,2051,981],{"class":1067},[953,2053,1070],{"class":963},[953,2055,1046],{"class":1013},[953,2057,1075],{"class":963},[953,2059,1078],{"class":1067},[953,2061,1033],{"class":963},[953,2063,2064],{"class":955,"line":1132},[953,2065,1616],{"class":1615},[953,2067,2068,2070,2072],{"class":955,"line":1183},[953,2069,1621],{"class":1013},[953,2071,1175],{"class":1067},[953,2073,1033],{"class":963},[953,2075,2076,2078,2080,2082,2084,2086,2088,2090,2092],{"class":955,"line":1199},[953,2077,1630],{"class":959},[953,2079,1211],{"class":963},[953,2081,1635],{"class":1017},[953,2083,1027],{"class":963},[953,2085,1640],{"class":1067},[953,2087,1643],{"class":963},[953,2089,1175],{"class":1067},[953,2091,1178],{"class":963},[953,2093,1056],{"class":963},[953,2095,2096,2098,2100,2102,2104,2106],{"class":955,"line":1205},[953,2097,1654],{"class":1067},[953,2099,1657],{"class":963},[953,2101,1660],{"class":1049},[953,2103,1143],{"class":963},[953,2105,1665],{"class":1237},[953,2107,1668],{"class":963},[953,2109,2110],{"class":955,"line":1229},[953,2111,1258],{"class":963},[953,2113,2114,2116,2118,2120,2122,2124],{"class":955,"line":1255},[953,2115,1208],{"class":959},[953,2117,1211],{"class":963},[953,2119,1214],{"class":1013},[953,2121,1217],{"class":1067},[953,2123,1220],{"class":963},[953,2125,1428],{"class":1067},[953,2127,2128,2130,2132,2134,2136,2138,2141,2143,2145,2147,2149,2151,2153,2155,2157,2159,2161,2163],{"class":955,"line":1261},[953,2129,1433],{"class":963},[953,2131,1024],{"class":1017},[953,2133,1027],{"class":963},[953,2135,1440],{"class":1017},[953,2137,1027],{"class":963},[953,2139,2140],{"class":1049},"filter",[953,2142,1447],{"class":963},[953,2144,1169],{"class":1067},[953,2146,1046],{"class":1013},[953,2148,1175],{"class":1174},[953,2150,1178],{"class":963},[953,2152,1458],{"class":963},[953,2154,1461],{"class":959},[953,2156,1189],{"class":1067},[953,2158,1075],{"class":963},[953,2160,1747],{"class":1084},[953,2162,1470],{"class":963},[953,2164,2165],{"class":963}," })\n",[953,2167,2168,2170,2172,2174,2176,2178,2181,2183,2185],{"class":955,"line":1698},[953,2169,1433],{"class":963},[953,2171,1024],{"class":1017},[953,2173,1027],{"class":963},[953,2175,1440],{"class":1017},[953,2177,1027],{"class":963},[953,2179,2180],{"class":1049},"take",[953,2182,1143],{"class":963},[953,2184,1802],{"class":1084},[953,2186,2187],{"class":963},")\n",[953,2189,2190,2192,2194,2196,2198,2200,2202,2204,2206,2208,2210,2212,2214,2216,2218,2220,2222,2224,2226,2229,2231],{"class":955,"line":1738},[953,2191,1433],{"class":963},[953,2193,1024],{"class":1017},[953,2195,1027],{"class":963},[953,2197,1440],{"class":1017},[953,2199,1027],{"class":963},[953,2201,1140],{"class":1049},[953,2203,1447],{"class":963},[953,2205,1169],{"class":1067},[953,2207,1046],{"class":1013},[953,2209,1175],{"class":1174},[953,2211,1178],{"class":963},[953,2213,1458],{"class":963},[953,2215,1461],{"class":959},[953,2217,1024],{"class":1017},[953,2219,1027],{"class":963},[953,2221,1888],{"class":1049},[953,2223,1143],{"class":963},[953,2225,1665],{"class":1067},[953,2227,2228],{"class":963},");",[953,2230,1473],{"class":963},[953,2232,1056],{"class":963},[953,2234,2235,2237,2239,2241,2243,2245,2247,2249,2251],{"class":955,"line":1752},[953,2236,1232],{"class":1017},[953,2238,1027],{"class":963},[953,2240,1238],{"class":1237},[953,2242,1241],{"class":963},[953,2244,1217],{"class":1237},[953,2246,1241],{"class":963},[953,2248,1248],{"class":963},[953,2250,1248],{"class":963},[953,2252,1033],{"class":963},[953,2254,2255],{"class":955,"line":1757},[953,2256,1258],{"class":963},[953,2258,2259],{"class":955,"line":1763},[953,2260,1264],{"class":963},[918,2262,2263,2264,2267,2268,2271,2272,2274],{},"你甚至可以更激进地，使用输入视图 ",[928,2265,2266],{},"std::views::istream"," 和输出迭代器 ",[928,2269,2270],{},"std::ostream_iterator","。此时，可以直接用 ",[928,2273,941],{}," 将输入和输出“连接”起来。",[944,2276,2278],{"className":946,"code":2277,"language":948,"meta":949,"style":949},"#include \u003Ciostream>\n#include \u003Calgorithm>\n#include \u003Citerator>\n#include \u003Cranges>\n#include \u003Ccmath>\nnamespace rg = std::ranges;\n\nint main() {\n    rg::copy(std::views::istream\u003Cint>(std::cin)\n            | std::views::filter([](\u002Fint x) { return x > 0; })\n            | std::views::take(5)\n            | std::views::transform([](\u002Fint x) { return std::sqrt(x); }),\n        std::ostream_iterator\u003Cdouble>{std::cout, \" \"});\n}\n",[928,2279,2280,2290,2300,2310,2320,2330,2346,2350,2360,2398,2437,2457,2500,2536],{"__ignoreMap":949},[953,2281,2282,2284,2286,2288],{"class":955,"line":956},[953,2283,960],{"class":959},[953,2285,964],{"class":963},[953,2287,968],{"class":967},[953,2289,971],{"class":963},[953,2291,2292,2294,2296,2298],{"class":955,"line":974},[953,2293,960],{"class":959},[953,2295,964],{"class":963},[953,2297,993],{"class":967},[953,2299,971],{"class":963},[953,2301,2302,2304,2306,2308],{"class":955,"line":986},[953,2303,960],{"class":959},[953,2305,964],{"class":963},[953,2307,1005],{"class":967},[953,2309,971],{"class":963},[953,2311,2312,2314,2316,2318],{"class":955,"line":998},[953,2313,960],{"class":959},[953,2315,964],{"class":963},[953,2317,1030],{"class":967},[953,2319,971],{"class":963},[953,2321,2322,2324,2326,2328],{"class":955,"line":1010},[953,2323,960],{"class":959},[953,2325,964],{"class":963},[953,2327,1560],{"class":967},[953,2329,971],{"class":963},[953,2331,2332,2334,2336,2338,2340,2342,2344],{"class":955,"line":1036},[953,2333,1014],{"class":1013},[953,2335,1018],{"class":1017},[953,2337,1021],{"class":963},[953,2339,1024],{"class":1017},[953,2341,1027],{"class":963},[953,2343,1030],{"class":1017},[953,2345,1033],{"class":963},[953,2347,2348],{"class":955,"line":1043},[953,2349,1040],{"emptyLinePlaceholder":1039},[953,2351,2352,2354,2356,2358],{"class":955,"line":1059},[953,2353,1046],{"class":1013},[953,2355,1050],{"class":1049},[953,2357,1053],{"class":963},[953,2359,1056],{"class":963},[953,2361,2362,2364,2366,2369,2371,2373,2375,2377,2379,2382,2384,2386,2389,2391,2393,2396],{"class":955,"line":1112},[953,2363,1135],{"class":1017},[953,2365,1027],{"class":963},[953,2367,2368],{"class":1049},"copy",[953,2370,1143],{"class":963},[953,2372,1635],{"class":1017},[953,2374,1027],{"class":963},[953,2376,1440],{"class":1017},[953,2378,1027],{"class":963},[953,2380,2381],{"class":1049},"istream",[953,2383,1070],{"class":963},[953,2385,1046],{"class":1013},[953,2387,2388],{"class":963},">(",[953,2390,1635],{"class":1017},[953,2392,1027],{"class":963},[953,2394,2395],{"class":1067},"cin",[953,2397,2187],{"class":963},[953,2399,2400,2403,2405,2407,2409,2411,2413,2415,2417,2419,2421,2423,2425,2427,2429,2431,2433,2435],{"class":955,"line":1132},[953,2401,2402],{"class":963},"            |",[953,2404,1024],{"class":1017},[953,2406,1027],{"class":963},[953,2408,1440],{"class":1017},[953,2410,1027],{"class":963},[953,2412,2140],{"class":1049},[953,2414,1447],{"class":963},[953,2416,1169],{"class":1067},[953,2418,1046],{"class":1013},[953,2420,1175],{"class":1174},[953,2422,1178],{"class":963},[953,2424,1458],{"class":963},[953,2426,1461],{"class":959},[953,2428,1189],{"class":1067},[953,2430,1075],{"class":963},[953,2432,1747],{"class":1084},[953,2434,1470],{"class":963},[953,2436,2165],{"class":963},[953,2438,2439,2441,2443,2445,2447,2449,2451,2453,2455],{"class":955,"line":1183},[953,2440,2402],{"class":963},[953,2442,1024],{"class":1017},[953,2444,1027],{"class":963},[953,2446,1440],{"class":1017},[953,2448,1027],{"class":963},[953,2450,2180],{"class":1049},[953,2452,1143],{"class":963},[953,2454,1802],{"class":1084},[953,2456,2187],{"class":963},[953,2458,2459,2461,2463,2465,2467,2469,2471,2473,2475,2477,2479,2481,2483,2485,2487,2489,2491,2493,2495,2497],{"class":955,"line":1199},[953,2460,2402],{"class":963},[953,2462,1024],{"class":1017},[953,2464,1027],{"class":963},[953,2466,1440],{"class":1017},[953,2468,1027],{"class":963},[953,2470,1140],{"class":1049},[953,2472,1447],{"class":963},[953,2474,1169],{"class":1067},[953,2476,1046],{"class":1013},[953,2478,1175],{"class":1174},[953,2480,1178],{"class":963},[953,2482,1458],{"class":963},[953,2484,1461],{"class":959},[953,2486,1024],{"class":1017},[953,2488,1027],{"class":963},[953,2490,1888],{"class":1049},[953,2492,1143],{"class":963},[953,2494,1665],{"class":1067},[953,2496,2228],{"class":963},[953,2498,2499],{"class":963}," }),\n",[953,2501,2502,2504,2506,2509,2511,2513,2515,2517,2519,2521,2524,2526,2529,2531,2534],{"class":955,"line":1205},[953,2503,1232],{"class":1017},[953,2505,1027],{"class":963},[953,2507,2508],{"class":1067},"ostream_iterator",[953,2510,1070],{"class":963},[953,2512,1829],{"class":1013},[953,2514,1075],{"class":963},[953,2516,1081],{"class":1067},[953,2518,1635],{"class":1017},[953,2520,1027],{"class":963},[953,2522,2523],{"class":1067},"cout",[953,2525,1088],{"class":963},[953,2527,2528],{"class":963}," \"",[953,2530,2528],{"class":963},[953,2532,2533],{"class":1067},"}",[953,2535,1668],{"class":963},[953,2537,2538],{"class":955,"line":1229},[953,2539,1264],{"class":963},[918,2541,2542],{},"所谓的“函数式编程思想”的一大特点就是，只考虑数据如何通过若干函数变换，写代码相当于将变换的过程描述出来；此外，不考虑具体怎样实现、数据如何存储、程序如何运行。上面的这段代码充分展现了这一特点：它只描述了从输入数据一步一步转换到输出的步骤，不再引入循环、变量等具体的实现细节。因此，函数式编程减轻了程序员的负担，也让代码更容易阅读。",[2544,2545,2546],"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 .sBMFI, html code.shiki .sBMFI{--shiki-light:#E2931D;--shiki-default:#FFCB6B;--shiki-dark:#FFCB6B}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 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 .swJcz, html code.shiki .swJcz{--shiki-light:#E53935;--shiki-default:#F07178;--shiki-dark:#F07178}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}",{"title":949,"searchDepth":956,"depth":974,"links":2548},[],"下一个函数式特性是变换（Transform），别的编程语言习惯叫做映射（Map）。","md",null,{},{"icon":827},{"title":861,"description":2549},"QqVsZ3sY7SmAc8ga3oiNrTis6yBjCHXD5Dq5wvNlRjc",[2557,2559],{"title":857,"path":858,"stem":859,"description":2558,"icon":827,"children":-1},"我们在刚刚已经见过了排序算法的基本使用。",{"title":871,"path":867,"stem":872,"description":2560,"icon":866,"children":-1},"模板特化、定制点、概念与模板元编程",1784618145548]