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(*",[937,1040,919],{"class":947},[937,1042,1043],{"class":951},")[",[937,1045,962],{"class":955},[937,1047,1048],{"class":951},"]{nullptr};\n",[919,1050,1051,1052,1055,1056,1059],{},"是不是看上去特别诡异。后面的 ",[923,1053,1054],{},"{nullptr}"," 是初始化器，如果不带初始化器就声明成 ",[923,1057,1058],{},"int (*p)[5];","。你问为什么这么古怪？别问，问就是历史遗留。所以当你把二维数组作为函数形参的时候，它实际上是把指向数组的指针作为了形参。",[928,1061,1063],{"className":930,"code":1062,"language":932,"meta":933,"style":933},"#include \u003Ciostream>\nusing namespace std;\nvoid f(int(*)[5]);\nint main() {\n    int a[4][5]{};\n    f(a);\n}\nvoid f(int (*p)[5]) {\n    cout \u003C\u003C sizeof(*p) \u003C\u003C endl;\n}\n",[923,1064,1065,1081,1095,1118,1132,1150,1163,1169,1193,1216],{"__ignoreMap":933},[937,1066,1067,1071,1074,1078],{"class":939,"line":940},[937,1068,1070],{"class":1069},"s7zQu","#include",[937,1072,1073],{"class":951}," 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int",[937,1139,948],{"class":947},[937,1141,952],{"class":951},[937,1143,956],{"class":955},[937,1145,959],{"class":951},[937,1147,962],{"class":955},[937,1149,965],{"class":951},[937,1151,1153,1156,1158,1160],{"class":939,"line":1152},6,[937,1154,1155],{"class":1103},"    f",[937,1157,1107],{"class":951},[937,1159,991],{"class":947},[937,1161,1162],{"class":951},");\n",[937,1164,1166],{"class":939,"line":1165},7,[937,1167,1168],{"class":951},"}\n",[937,1170,1172,1174,1176,1178,1180,1182,1184,1186,1188,1191],{"class":939,"line":1171},8,[937,1173,1100],{"class":943},[937,1175,1104],{"class":1103},[937,1177,1107],{"class":951},[937,1179,944],{"class":943},[937,1181,1038],{"class":951},[937,1183,919],{"class":947},[937,1185,1043],{"class":951},[937,1187,962],{"class":955},[937,1189,1190],{"class":951},"])",[937,1192,1131],{"class":951},[937,1194,1196,1199,1201,1204,1206,1209,1212,1214],{"class":939,"line":1195},9,[937,1197,1198],{"class":947},"    cout ",[937,1200,974],{"class":951},[937,1202,1203],{"class":951}," sizeof(*",[937,1205,919],{"class":947},[937,1207,1208],{"class":951},")",[937,1210,1211],{"class":951}," \u003C\u003C",[937,1213,982],{"class":947},[937,1215,985],{"class":951},[937,1217,1219],{"class":939,"line":1218},10,[937,1220,1168],{"class":951},[919,1222,1223,1224,1227,1228,1231],{},"这段代码就使用了这样的语法，其中 ",[923,1225,1226],{},"int(*)[5]"," 就是这个该死的指针的类型标识。这个括号是不能省的，一旦省略就变成由 5 个 ",[923,1229,1230],{},"int*"," 构成的数组了，而非一个指针。",[1233,1234],"h6",{"id":1235},"idx_类型别名",[919,1237,1238,1239,1243],{},"我很不喜欢这种声明语句，所以这里介绍一个方法：使用",[1240,1241,1242],"strong",{},"类型别名","（Type alias）。声明类型别名的语法是这样的：",[1245,1246,1247],"sdsc",{},[919,1248,1249],{},"\"using\" 别名 \"=\" 类型标识\";\"",[919,1251,1252],{},"比如",[928,1254,1256],{"className":930,"code":1255,"language":932,"meta":933,"style":933},"using ArrayOf5Int = int[5];\n",[923,1257,1258],{"__ignoreMap":933},[937,1259,1260,1262,1265,1268,1271,1273,1275],{"class":939,"line":940},[937,1261,1085],{"class":955},[937,1263,1264],{"class":1091}," ArrayOf5Int",[937,1266,1267],{"class":951}," =",[937,1269,1270],{"class":943}," int",[937,1272,952],{"class":951},[937,1274,962],{"class":955},[937,1276,1277],{"class":951},"];\n",[919,1279,988,1280,1283,1284,1286],{},[923,1281,1282],{},"ArrayOf5Int"," 就完全等价于 ",[923,1285,925],{}," 这个类型了。比如：",[928,1288,1290],{"className":930,"code":1289,"language":932,"meta":933,"style":933},"ArrayOf5Int b{};\n",[923,1291,1292],{"__ignoreMap":933},[937,1293,1294,1297],{"class":939,"line":940},[937,1295,1296],{"class":947},"ArrayOf5Int b",[937,1298,1299],{"class":951},"{};\n",[919,1301,1302,1303,1306,1307,1309],{},"就声明了一个数组 ",[923,1304,1305],{},"b","，它拥有 5 个 ",[923,1308,944],{}," 元素。类似地，我们可以很优雅地声明指向数组的指针：",[928,1311,1313],{"className":930,"code":1312,"language":932,"meta":933,"style":933},"ArrayOf5Int* p{nullptr};\n",[923,1314,1315],{"__ignoreMap":933},[937,1316,1317,1319,1322,1325],{"class":939,"line":940},[937,1318,1282],{"class":947},[937,1320,1321],{"class":951},"*",[937,1323,1324],{"class":947}," p",[937,1326,1327],{"class":951},"{nullptr};\n",[919,1329,1330],{},"看上去就正常不少。使用类型别名后，刚刚的代码可以改写成这个样子：",[928,1332,1334],{"className":930,"code":1333,"language":932,"meta":933,"style":933},"#include \u003Ciostream>\nusing namespace std;\nusing ArrayOf5Int = int[5];\nvoid f(ArrayOf5Int*);\nint main() {\n    ArrayOf5Int a[4]{}; \u002F\u002F 等价于 int a[4][5]{};\n    f(a);\n}\nvoid f(ArrayOf5Int* p) {\n    cout \u003C\u003C sizeof(*p) \u003C\u003C endl;\n}\n",[923,1335,1336,1346,1356,1372,1386,1396,1412,1422,1426,1445,1463],{"__ignoreMap":933},[937,1337,1338,1340,1342,1344],{"class":939,"line":940},[937,1339,1070],{"class":1069},[937,1341,1073],{"class":951},[937,1343,1077],{"class":1076},[937,1345,1080],{"class":951},[937,1347,1348,1350,1352,1354],{"class":939,"line":968},[937,1349,1085],{"class":955},[937,1351,1088],{"class":943},[937,1353,1092],{"class":1091},[937,1355,985],{"class":951},[937,1357,1358,1360,1362,1364,1366,1368,1370],{"class":939,"line":1097},[937,1359,1085],{"class":955},[937,1361,1264],{"class":1091},[937,1363,1267],{"class":951},[937,1365,1270],{"class":943},[937,1367,952],{"class":951},[937,1369,962],{"class":955},[937,1371,1277],{"class":951},[937,1373,1374,1376,1378,1380,1382,1384],{"class":939,"line":1120},[937,1375,1100],{"class":943},[937,1377,1104],{"class":1103},[937,1379,1107],{"class":951},[937,1381,1282],{"class":1091},[937,1383,1321],{"class":943},[937,1385,1162],{"class":951},[937,1387,1388,1390,1392,1394],{"class":939,"line":1134},[937,1389,944],{"class":943},[937,1391,1125],{"class":1103},[937,1393,1128],{"class":951},[937,1395,1131],{"class":951},[937,1397,1398,1401,1403,1405,1408],{"class":939,"line":1152},[937,1399,1400],{"class":947},"    ArrayOf5Int a",[937,1402,952],{"class":951},[937,1404,956],{"class":955},[937,1406,1407],{"class":951},"]{};",[937,1409,1411],{"class":1410},"sHwdD"," \u002F\u002F 等价于 int a[4][5]{};\n",[937,1413,1414,1416,1418,1420],{"class":939,"line":1165},[937,1415,1155],{"class":1103},[937,1417,1107],{"class":951},[937,1419,991],{"class":947},[937,1421,1162],{"class":951},[937,1423,1424],{"class":939,"line":1171},[937,1425,1168],{"class":951},[937,1427,1428,1430,1432,1434,1436,1438,1441,1443],{"class":939,"line":1195},[937,1429,1100],{"class":943},[937,1431,1104],{"class":1103},[937,1433,1107],{"class":951},[937,1435,1282],{"class":1091},[937,1437,1321],{"class":943},[937,1439,1324],{"class":1440},"sHdIc",[937,1442,1208],{"class":951},[937,1444,1131],{"class":951},[937,1446,1447,1449,1451,1453,1455,1457,1459,1461],{"class":939,"line":1218},[937,1448,1198],{"class":947},[937,1450,974],{"class":951},[937,1452,1203],{"class":951},[937,1454,919],{"class":947},[937,1456,1208],{"class":951},[937,1458,1211],{"class":951},[937,1460,982],{"class":947},[937,1462,985],{"class":951},[937,1464,1466],{"class":939,"line":1465},11,[937,1467,1168],{"class":951},[1021,1469,1470],{"id":1470},"指针的只读性",[919,1472,1473,1474,1477,1478,1480],{},"在 C++ 中，只读变量和非只读变量拥有不同的类型（即 ",[923,1475,1476],{},"const int"," 和 ",[923,1479,944],{}," 是两个类型）。所以有",[928,1482,1484],{"className":930,"code":1483,"language":932,"meta":933,"style":933},"int* p{nullptr};       \u002F\u002F p 拥有指向 int 的指针类型\nconst int* q{nullptr}; \u002F\u002F q 拥有指向 const int 的指针类型\n",[923,1485,1486,1500],{"__ignoreMap":933},[937,1487,1488,1490,1492,1494,1497],{"class":939,"line":940},[937,1489,944],{"class":943},[937,1491,1321],{"class":951},[937,1493,1324],{"class":947},[937,1495,1496],{"class":951},"{nullptr};",[937,1498,1499],{"class":1410},"       \u002F\u002F p 拥有指向 int 的指针类型\n",[937,1501,1502,1505,1507,1509,1512,1514],{"class":939,"line":968},[937,1503,1504],{"class":943},"const",[937,1506,1270],{"class":943},[937,1508,1321],{"class":951},[937,1510,1511],{"class":947}," q",[937,1513,1496],{"class":951},[937,1515,1516],{"class":1410}," \u002F\u002F q 拥有指向 const int 的指针类型\n",[919,1518,1519,1520,1523],{},"但是请注意，指针 ",[923,1521,1522],{},"q"," 本身不是只读的。它只是指向只读变量而已：",[928,1525,1527],{"className":930,"code":1526,"language":932,"meta":933,"style":933},"#include \u003Ciostream>\nusing namespace std;\nint main() {\n    const int a{42};\n    const int* p{&a};\n    *p = 56;     \u002F\u002F 错误，*p 是 const int 类型，只读的\n    p = nullptr; \u002F\u002F OK, p 不是只读的，可以被赋值\n}\n",[923,1528,1529,1539,1549,1559,1577,1595,1615,1628],{"__ignoreMap":933},[937,1530,1531,1533,1535,1537],{"class":939,"line":940},[937,1532,1070],{"class":1069},[937,1534,1073],{"class":951},[937,1536,1077],{"class":1076},[937,1538,1080],{"class":951},[937,1540,1541,1543,1545,1547],{"class":939,"line":968},[937,1542,1085],{"class":955},[937,1544,1088],{"class":943},[937,1546,1092],{"class":1091},[937,1548,985],{"class":951},[937,1550,1551,1553,1555,1557],{"class":939,"line":1097},[937,1552,944],{"class":943},[937,1554,1125],{"class":1103},[937,1556,1128],{"class":951},[937,1558,1131],{"class":951},[937,1560,1561,1564,1566,1568,1571,1574],{"class":939,"line":1120},[937,1562,1563],{"class":943},"    const",[937,1565,1270],{"class":943},[937,1567,948],{"class":947},[937,1569,1570],{"class":951},"{",[937,1572,1573],{"class":955},"42",[937,1575,1576],{"class":951},"};\n",[937,1578,1579,1581,1583,1585,1587,1590,1593],{"class":939,"line":1134},[937,1580,1563],{"class":943},[937,1582,1270],{"class":943},[937,1584,1321],{"class":951},[937,1586,1324],{"class":947},[937,1588,1589],{"class":951},"{&",[937,1591,991],{"class":1592},"swJcz",[937,1594,1576],{"class":951},[937,1596,1597,1600,1603,1606,1609,1612],{"class":939,"line":1152},[937,1598,1599],{"class":951},"    *",[937,1601,1602],{"class":947},"p ",[937,1604,1605],{"class":951},"=",[937,1607,1608],{"class":955}," 56",[937,1610,1611],{"class":951},";",[937,1613,1614],{"class":1410},"     \u002F\u002F 错误，*p 是 const int 类型，只读的\n",[937,1616,1617,1620,1622,1625],{"class":939,"line":1165},[937,1618,1619],{"class":947},"    p ",[937,1621,1605],{"class":951},[937,1623,1624],{"class":951}," nullptr;",[937,1626,1627],{"class":1410}," \u002F\u002F OK, p 不是只读的，可以被赋值\n",[937,1629,1630],{"class":939,"line":1171},[937,1631,1168],{"class":951},[919,1633,1634,1635,1637,1638,1640],{},"如果要声明一个只读的指针，需要把 ",[923,1636,1504],{}," 放在 ",[923,1639,1321],{}," 的右边。",[928,1642,1644],{"className":930,"code":1643,"language":932,"meta":933,"style":933},"int a;\nint* const p{&a}; \u002F\u002F p 是指向 int 的只读指针\n",[923,1645,1646,1654],{"__ignoreMap":933},[937,1647,1648,1650,1652],{"class":939,"line":940},[937,1649,944],{"class":943},[937,1651,948],{"class":947},[937,1653,985],{"class":951},[937,1655,1656,1658,1660,1663,1665,1667,1669,1672],{"class":939,"line":968},[937,1657,944],{"class":943},[937,1659,1321],{"class":951},[937,1661,1662],{"class":943}," const",[937,1664,1324],{"class":947},[937,1666,1589],{"class":951},[937,1668,991],{"class":1592},[937,1670,1671],{"class":951},"};",[937,1673,1674],{"class":1410}," \u002F\u002F p 是指向 int 的只读指针\n",[919,1676,988,1677,1002,1680,1682,1683,1685,1686,1688],{},[923,1678,1679],{},"*p",[923,1681,944],{}," 类型可以更改，但是 ",[923,1684,919],{}," 只读不能更改——也就是说，",[923,1687,919],{}," 自始至终只能指向一个确定的变量。",[928,1690,1692],{"className":930,"code":1691,"language":932,"meta":933,"style":933},"#include \u003Ciostream>\nusing namespace std;\nint main() {\n    int a{42};\n    int* const p{&a};\n    *p = 56;     \u002F\u002F OK，*p 是 int 类型\n    p = nullptr; \u002F\u002F 错误, p 是只读的\n}\n",[923,1693,1694,1704,1714,1724,1736,1752,1767,1778],{"__ignoreMap":933},[937,1695,1696,1698,1700,1702],{"class":939,"line":940},[937,1697,1070],{"class":1069},[937,1699,1073],{"class":951},[937,1701,1077],{"class":1076},[937,1703,1080],{"class":951},[937,1705,1706,1708,1710,1712],{"class":939,"line":968},[937,1707,1085],{"class":955},[937,1709,1088],{"class":943},[937,1711,1092],{"class":1091},[937,1713,985],{"class":951},[937,1715,1716,1718,1720,1722],{"class":939,"line":1097},[937,1717,944],{"class":943},[937,1719,1125],{"class":1103},[937,1721,1128],{"class":951},[937,1723,1131],{"class":951},[937,1725,1726,1728,1730,1732,1734],{"class":939,"line":1120},[937,1727,1137],{"class":943},[937,1729,948],{"class":947},[937,1731,1570],{"class":951},[937,1733,1573],{"class":955},[937,1735,1576],{"class":951},[937,1737,1738,1740,1742,1744,1746,1748,1750],{"class":939,"line":1134},[937,1739,1137],{"class":943},[937,1741,1321],{"class":951},[937,1743,1662],{"class":943},[937,1745,1324],{"class":947},[937,1747,1589],{"class":951},[937,1749,991],{"class":1592},[937,1751,1576],{"class":951},[937,1753,1754,1756,1758,1760,1762,1764],{"class":939,"line":1152},[937,1755,1599],{"class":951},[937,1757,1602],{"class":947},[937,1759,1605],{"class":951},[937,1761,1608],{"class":955},[937,1763,1611],{"class":951},[937,1765,1766],{"class":1410},"     \u002F\u002F OK，*p 是 int 类型\n",[937,1768,1769,1771,1773,1775],{"class":939,"line":1165},[937,1770,1619],{"class":947},[937,1772,1605],{"class":951},[937,1774,1624],{"class":951},[937,1776,1777],{"class":1410}," \u002F\u002F 错误, p 是只读的\n",[937,1779,1780],{"class":939,"line":1171},[937,1781,1168],{"class":951},[919,1783,1784],{},"如果你看不惯的话，你也可以用类型别名。",[928,1786,1788],{"className":930,"code":1787,"language":932,"meta":933,"style":933},"int a;\nusing PtrToInt = int*;\nconst PtrToInt p{&a}; \u002F\u002F 只读指针 int* const\n",[923,1789,1790,1798,1812],{"__ignoreMap":933},[937,1791,1792,1794,1796],{"class":939,"line":940},[937,1793,944],{"class":943},[937,1795,948],{"class":947},[937,1797,985],{"class":951},[937,1799,1800,1802,1805,1807,1810],{"class":939,"line":968},[937,1801,1085],{"class":955},[937,1803,1804],{"class":1091}," PtrToInt",[937,1806,1267],{"class":951},[937,1808,1809],{"class":943}," int*",[937,1811,985],{"class":951},[937,1813,1814,1816,1819,1821,1823,1825],{"class":939,"line":1097},[937,1815,1504],{"class":943},[937,1817,1818],{"class":947}," PtrToInt p",[937,1820,1589],{"class":951},[937,1822,991],{"class":1592},[937,1824,1671],{"class":951},[937,1826,1827],{"class":1410}," \u002F\u002F 只读指针 int* const\n",[1021,1829,1831,1832,1834],{"id":1830},"指向-void-的指针","指向 ",[923,1833,1100],{}," 的指针",[919,1836,1837,1838,1840],{},"存在一种特殊类型的指针，称为指向 ",[923,1839,1100],{}," 的指针：",[928,1842,1844],{"className":930,"code":1843,"language":932,"meta":933,"style":933},"void* p{nullptr};\n",[923,1845,1846],{"__ignoreMap":933},[937,1847,1848,1850,1852,1854],{"class":939,"line":940},[937,1849,1100],{"class":943},[937,1851,1321],{"class":951},[937,1853,1324],{"class":947},[937,1855,1327],{"class":951},[919,1857,1858,1859,1862,1863,1866,1867,1869,1870,1872],{},"你可以将 ",[923,1860,1861],{},"void*"," 理解为指向",[1240,1864,1865],{},"任意类型","的指针类型。因为任何指针都可以隐式转换到 ",[923,1868,1861],{}," 类型，即 ",[923,1871,1861],{}," 是一个通用的指针类型。",[919,1874,1875,1876,1878],{},"但是，对 ",[923,1877,1861],{}," 类型做算术运算和解地址运算是未定义的。所以就目前而言，它的用途比较小；常见的只有：",[928,1880,1882],{"className":930,"code":1881,"language":932,"meta":933,"style":933},"void printPtr(void* p) {\n    cout \u003C\u003C p \u003C\u003C endl;\n}\n",[923,1883,1884,1901,1916],{"__ignoreMap":933},[937,1885,1886,1888,1891,1893,1895,1897,1899],{"class":939,"line":940},[937,1887,1100],{"class":943},[937,1889,1890],{"class":1103}," printPtr",[937,1892,1107],{"class":951},[937,1894,1861],{"class":943},[937,1896,1324],{"class":1440},[937,1898,1208],{"class":951},[937,1900,1131],{"class":951},[937,1902,1903,1905,1907,1910,1912,1914],{"class":939,"line":968},[937,1904,1198],{"class":947},[937,1906,974],{"class":951},[937,1908,1909],{"class":947}," p ",[937,1911,974],{"class":951},[937,1913,982],{"class":947},[937,1915,985],{"class":951},[937,1917,1918],{"class":939,"line":1097},[937,1919,1168],{"class":951},[919,1921,1922,1923,1926,1927,1929,1930,1932],{},"通过这个函数，可以输出 ",[923,1924,1925],{},"char*"," 指针的值（而非输出字符串）。这是因为发生了从 ",[923,1928,1925],{}," 到 ",[923,1931,1861],{}," 的转换。",[928,1934,1936],{"className":930,"code":1935,"language":932,"meta":933,"style":933},"char a{};\nchar* p{&a};\nprintPtr(p);\n",[923,1937,1938,1947,1961],{"__ignoreMap":933},[937,1939,1940,1943,1945],{"class":939,"line":940},[937,1941,1942],{"class":943},"char",[937,1944,948],{"class":947},[937,1946,1299],{"class":951},[937,1948,1949,1951,1953,1955,1957,1959],{"class":939,"line":968},[937,1950,1942],{"class":943},[937,1952,1321],{"class":951},[937,1954,1324],{"class":947},[937,1956,1589],{"class":951},[937,1958,991],{"class":1592},[937,1960,1576],{"class":951},[937,1962,1963,1966,1968,1970],{"class":939,"line":1097},[937,1964,1965],{"class":1103},"printPtr",[937,1967,1107],{"class":951},[937,1969,919],{"class":947},[937,1971,1162],{"class":951},[919,1973,1974,1975,1978],{},"当然你也可以直接进行强制类型转换：",[923,1976,1977],{},"cout \u003C\u003C (void*)p \u003C\u003C endl;","。",[1021,1980,1981],{"id":1981},"指向函数的指针",[1233,1983],{"id":1984},"idx_函数指针",[919,1986,1987,1988,1991],{},"之前讨论的一直是指向变量的指针。实际上，C\u002FC++ 还提供了指向函数的指针，俗称为",[1240,1989,1990],{},"函数指针","。它的声明如下：",[1245,1993,1994],{},[919,1995,1996,1997,2000,2001,2004],{},"返回值类型 \"(*\"指针名\")(\"",[937,1998,1999],{},"参数列表","\")\"",[937,2002,2003],{},"初始化器","\";\"",[919,2006,2007],{},"比如：",[928,2009,2011],{"className":930,"code":2010,"language":932,"meta":933,"style":933},"int (*ptr)(int, int){nullptr};\n",[923,2012,2013],{"__ignoreMap":933},[937,2014,2015,2017,2019,2022,2025,2027,2030,2032],{"class":939,"line":940},[937,2016,944],{"class":943},[937,2018,1038],{"class":951},[937,2020,2021],{"class":947},"ptr",[937,2023,2024],{"class":951},")(",[937,2026,944],{"class":943},[937,2028,2029],{"class":951},",",[937,2031,1270],{"class":943},[937,2033,2034],{"class":951},"){nullptr};\n",[919,2036,2037,2038,2041,2042,2045,2046,2048],{},"它是一个基类型为函数的指针。其中这个函数必须接收 ",[923,2039,2040],{},"@参数列表@"," 所规定的数量、类型的参数，且返回值类型为 ",[923,2043,2044],{},"@返回值类型@","。比如上面示例中的函数指针 ",[923,2047,2021],{},"，它可以：",[928,2050,2052],{"className":930,"code":2051,"language":932,"meta":933,"style":933},"int (*ptr)(int, int){nullptr};\nint max(int, int);\nint main() {\n    ptr = &max; \u002F\u002F ptr 存储了函数 max 的地址，即指向 max\n}\n",[923,2053,2054,2072,2089,2099,2117],{"__ignoreMap":933},[937,2055,2056,2058,2060,2062,2064,2066,2068,2070],{"class":939,"line":940},[937,2057,944],{"class":943},[937,2059,1038],{"class":951},[937,2061,2021],{"class":947},[937,2063,2024],{"class":951},[937,2065,944],{"class":943},[937,2067,2029],{"class":951},[937,2069,1270],{"class":943},[937,2071,2034],{"class":951},[937,2073,2074,2076,2079,2081,2083,2085,2087],{"class":939,"line":968},[937,2075,944],{"class":943},[937,2077,2078],{"class":1103}," max",[937,2080,1107],{"class":951},[937,2082,944],{"class":943},[937,2084,2029],{"class":951},[937,2086,1270],{"class":943},[937,2088,1162],{"class":951},[937,2090,2091,2093,2095,2097],{"class":939,"line":1097},[937,2092,944],{"class":943},[937,2094,1125],{"class":1103},[937,2096,1128],{"class":951},[937,2098,1131],{"class":951},[937,2100,2101,2104,2106,2109,2112,2114],{"class":939,"line":1120},[937,2102,2103],{"class":947},"    ptr ",[937,2105,1605],{"class":951},[937,2107,2108],{"class":951}," &",[937,2110,2111],{"class":947},"max",[937,2113,1611],{"class":951},[937,2115,2116],{"class":1410}," \u002F\u002F ptr 存储了函数 max 的地址，即指向 max\n",[937,2118,2119],{"class":939,"line":1134},[937,2120,1168],{"class":951},[919,2122,2123],{},"你可以通过函数指针的解地址运算符来调用其所指向的函数：",[928,2125,2127],{"className":930,"code":2126,"language":932,"meta":933,"style":933},"int (*ptr)(int, int){&max};\n(*ptr)(3, 5); \u002F\u002F 调用了 max 函数\n",[923,2128,2129,2152],{"__ignoreMap":933},[937,2130,2131,2133,2135,2137,2139,2141,2143,2145,2148,2150],{"class":939,"line":940},[937,2132,944],{"class":943},[937,2134,1038],{"class":951},[937,2136,2021],{"class":947},[937,2138,2024],{"class":951},[937,2140,944],{"class":943},[937,2142,2029],{"class":951},[937,2144,1270],{"class":943},[937,2146,2147],{"class":951},"){&",[937,2149,2111],{"class":1592},[937,2151,1576],{"class":951},[937,2153,2154,2157,2159,2161,2164,2166,2169,2172],{"class":939,"line":968},[937,2155,2156],{"class":951},"(*",[937,2158,2021],{"class":947},[937,2160,2024],{"class":951},[937,2162,2163],{"class":955},"3",[937,2165,2029],{"class":951},[937,2167,2168],{"class":955}," 5",[937,2170,2171],{"class":951},");",[937,2173,2174],{"class":1410}," \u002F\u002F 调用了 max 函数\n",[919,2176,2177],{},"除此之外，C\u002FC++ 提供了一些“快捷方式”：",[2179,2180,2181,2185],"ol",{},[2182,2183,2184],"li",{},"所有的函数都可以隐式转换到指向自身的指针；",[2182,2186,2187],{},"函数指针可以不经过解地址运算符，直接调用其所指向的函数。",[919,2189,2190],{},"具体说就是：",[928,2192,2194],{"className":930,"code":2193,"language":932,"meta":933,"style":933},"int (*ptr)(int, int){nullptr};\nint max(int a, int b) {\n    return a > b ? a : b;\n}\nint main() {\n    ptr = &max;   \u002F\u002F 正常的赋值\n    ptr = max;    \u002F\u002F 亦可：max 先隐式转换为 &max，随后赋值\n\n    (*ptr)(3, 5); \u002F\u002F 先解地址，然后调用\n    ptr(3, 5);    \u002F\u002F 亦可：允许不解地址，直接调用其所指向的函数\n}\n",[923,2195,2196,2214,2237,2262,2266,2276,2291,2304,2310,2330,2348],{"__ignoreMap":933},[937,2197,2198,2200,2202,2204,2206,2208,2210,2212],{"class":939,"line":940},[937,2199,944],{"class":943},[937,2201,1038],{"class":951},[937,2203,2021],{"class":947},[937,2205,2024],{"class":951},[937,2207,944],{"class":943},[937,2209,2029],{"class":951},[937,2211,1270],{"class":943},[937,2213,2034],{"class":951},[937,2215,2216,2218,2220,2222,2224,2226,2228,2230,2233,2235],{"class":939,"line":968},[937,2217,944],{"class":943},[937,2219,2078],{"class":1103},[937,2221,1107],{"class":951},[937,2223,944],{"class":943},[937,2225,948],{"class":1440},[937,2227,2029],{"class":951},[937,2229,1270],{"class":943},[937,2231,2232],{"class":1440}," b",[937,2234,1208],{"class":951},[937,2236,1131],{"class":951},[937,2238,2239,2242,2244,2247,2250,2253,2255,2258,2260],{"class":939,"line":1097},[937,2240,2241],{"class":1069},"    return",[937,2243,977],{"class":947},[937,2245,2246],{"class":951},">",[937,2248,2249],{"class":947}," b ",[937,2251,2252],{"class":951},"?",[937,2254,977],{"class":947},[937,2256,2257],{"class":951},":",[937,2259,2232],{"class":947},[937,2261,985],{"class":951},[937,2263,2264],{"class":939,"line":1120},[937,2265,1168],{"class":951},[937,2267,2268,2270,2272,2274],{"class":939,"line":1134},[937,2269,944],{"class":943},[937,2271,1125],{"class":1103},[937,2273,1128],{"class":951},[937,2275,1131],{"class":951},[937,2277,2278,2280,2282,2284,2286,2288],{"class":939,"line":1152},[937,2279,2103],{"class":947},[937,2281,1605],{"class":951},[937,2283,2108],{"class":951},[937,2285,2111],{"class":947},[937,2287,1611],{"class":951},[937,2289,2290],{"class":1410},"   \u002F\u002F 正常的赋值\n",[937,2292,2293,2295,2297,2299,2301],{"class":939,"line":1165},[937,2294,2103],{"class":947},[937,2296,1605],{"class":951},[937,2298,2078],{"class":947},[937,2300,1611],{"class":951},[937,2302,2303],{"class":1410},"    \u002F\u002F 亦可：max 先隐式转换为 &max，随后赋值\n",[937,2305,2306],{"class":939,"line":1171},[937,2307,2309],{"emptyLinePlaceholder":2308},true,"\n",[937,2311,2312,2315,2317,2319,2321,2323,2325,2327],{"class":939,"line":1195},[937,2313,2314],{"class":951},"    (*",[937,2316,2021],{"class":947},[937,2318,2024],{"class":951},[937,2320,2163],{"class":955},[937,2322,2029],{"class":951},[937,2324,2168],{"class":955},[937,2326,2171],{"class":951},[937,2328,2329],{"class":1410}," \u002F\u002F 先解地址，然后调用\n",[937,2331,2332,2335,2337,2339,2341,2343,2345],{"class":939,"line":1218},[937,2333,2334],{"class":1103},"    ptr",[937,2336,1107],{"class":951},[937,2338,2163],{"class":955},[937,2340,2029],{"class":951},[937,2342,2168],{"class":955},[937,2344,2171],{"class":951},[937,2346,2347],{"class":1410},"    \u002F\u002F 亦可：允许不解地址，直接调用其所指向的函数\n",[937,2349,2350],{"class":939,"line":1465},[937,2351,1168],{"class":951},[2353,2354,2355],"style",{},"html pre.shiki code .spNyl, html code.shiki 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.s7zQu{--shiki-light:#39ADB5;--shiki-light-font-style:italic;--shiki-default:#89DDFF;--shiki-default-font-style:italic;--shiki-dark:#89DDFF;--shiki-dark-font-style:italic}html pre.shiki code .sfazB, html code.shiki .sfazB{--shiki-light:#91B859;--shiki-default:#C3E88D;--shiki-dark:#C3E88D}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 .sHwdD, html code.shiki .sHwdD{--shiki-light:#90A4AE;--shiki-light-font-style:italic;--shiki-default:#546E7A;--shiki-default-font-style:italic;--shiki-dark:#676E95;--shiki-dark-font-style:italic}html pre.shiki code .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}",{"title":933,"searchDepth":940,"depth":968,"links":2357},[2358,2359,2360,2362],{"id":1023,"depth":968,"text":1023},{"id":1470,"depth":968,"text":1470},{"id":1830,"depth":968,"text":2361},"指向 void 的指针",{"id":1981,"depth":968,"text":1981},"md",null,{},{"icon":371},{"title":385,"description":385},"BfLHzTHIsxP_k79iXa3F7FOhUR9U_aBxwTSxmyW2mr8",[2370,2372],{"title":381,"path":382,"stem":383,"description":2371,"icon":371,"children":-1},"上节提到了，指针是存放地址的变量。下面我们来学习如何声明并定义一个指针",{"title":389,"path":390,"stem":391,"description":389,"icon":371,"children":-1},1784618126734]