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bool",[998,1037,1038],{"class":1012},">;\n",[998,1040,1042],{"class":1000,"line":1041},2,[998,1043,1045],{"emptyLinePlaceholder":1044},true,"\n",[998,1047,1049,1053,1056],{"class":1000,"line":1048},3,[998,1050,1052],{"class":1051},"sTEyZ","ProductType t",[998,1054,1055],{"class":1012},";",[998,1057,1059],{"class":1058},"sHwdD"," \u002F\u002F t 具有 unsigned x bool 积类型，取值为两者的笛卡尔积中的元素\n",[924,1061,1062,1063,1066,1067,1070,1071,1073,1074,1077],{},"积运算的单位元叫做 ",[930,1064,1065],{},"1 类型","，也叫做",[930,1068,1069],{},"空元组类型","，在 C++ 中就是 ",[920,1072,939],{},"。之所以叫 1 类型是因为这个类型只有一种可能的值，就是空元组本身 ",[920,1075,1076],{},"std::tuple\u003C>{}","。",[1079,1080,1082,1083,1085],"h2",{"id":1081},"访问-stdtuple-的分量","访问 ",[920,1084,922],{}," 的分量",[924,1087,1088,1089,1091,1092,1095,1096,1098,1099,1102,1103,1105,1106,1109,1110,1077],{},"与具名的结构体不同，",[920,1090,922],{}," 中不会指定每个分量（成员）的名字，你只有对应分量的索引可以使用。比如上文中 ",[920,1093,1094],{},"ProductType"," 类型的第 0 个分量是 ",[920,1097,1029],{}," 类型的值，第 1 个分量是 ",[920,1100,1101],{},"bool"," 类型的值，整个 ",[920,1104,922],{}," 的值就由这两个分量构成。因此并没有类似成员访问运算符（",[920,1107,1108],{},".","）那样方便的方法可以访问到具体的分量，这里需要用到的是标准库函数 ",[920,1111,1112],{},"std::get",[924,1114,1082,1115,1117,1118,1121,1122,1125,1126,1129],{},[920,1116,922],{}," 变量 ",[920,1119,1120],{},"t"," 的第 ",[920,1123,1124],{},"N"," 个分量，应当使用 ",[920,1127,1128],{},"std::get\u003CN>(t)","。比如：",[989,1131,1133],{"className":991,"code":1132,"language":993,"meta":994,"style":994},"#include \u003Ciostream>\n#include \u003Ctuple> \u002F\u002F std::tuple 定义于此\nusing ProductType = std::tuple\u003Cunsigned, bool>;\n\nint main() {\n    ProductType a;    \u002F\u002F 默认构造\n    std::get\u003C0>(a) = 42u;\n    std::get\u003C1>(a) = true;\n    ProductType b{a}; \u002F\u002F 复制构造\n    std::cout \u003C\u003C std::get\u003C0>(b) \u003C\u003C \" \"\n              \u003C\u003C std::get\u003C1>(b) \u003C\u003C std::endl;\n}\n",[920,1134,1135,1151,1165,1189,1194,1210,1221,1254,1279,1297,1336,1369],{"__ignoreMap":994},[998,1136,1137,1141,1144,1148],{"class":1000,"line":1001},[998,1138,1140],{"class":1139},"s7zQu","#include",[998,1142,1143],{"class":1012}," \u003C",[998,1145,1147],{"class":1146},"sfazB","iostream",[998,1149,1150],{"class":1012},">\n",[998,1152,1153,1155,1157,1159,1162],{"class":1000,"line":1041},[998,1154,1140],{"class":1139},[998,1156,1143],{"class":1012},[998,1158,1022],{"class":1146},[998,1160,1161],{"class":1012},">",[998,1163,1164],{"class":1058}," \u002F\u002F std::tuple 定义于此\n",[998,1166,1167,1169,1171,1173,1175,1177,1179,1181,1183,1185,1187],{"class":1000,"line":1048},[998,1168,1005],{"class":1004},[998,1170,1009],{"class":1008},[998,1172,1013],{"class":1012},[998,1174,1016],{"class":1008},[998,1176,1019],{"class":1012},[998,1178,1022],{"class":1008},[998,1180,1025],{"class":1012},[998,1182,1029],{"class":1028},[998,1184,1032],{"class":1012},[998,1186,1035],{"class":1028},[998,1188,1038],{"class":1012},[998,1190,1192],{"class":1000,"line":1191},4,[998,1193,1045],{"emptyLinePlaceholder":1044},[998,1195,1197,1200,1204,1207],{"class":1000,"line":1196},5,[998,1198,1199],{"class":1028},"int",[998,1201,1203],{"class":1202},"s2Zo4"," main",[998,1205,1206],{"class":1012},"()",[998,1208,1209],{"class":1012}," {\n",[998,1211,1213,1216,1218],{"class":1000,"line":1212},6,[998,1214,1215],{"class":1051},"    ProductType a",[998,1217,1055],{"class":1012},[998,1219,1220],{"class":1058},"    \u002F\u002F 默认构造\n",[998,1222,1224,1227,1229,1232,1234,1237,1240,1243,1246,1248,1251],{"class":1000,"line":1223},7,[998,1225,1226],{"class":1008},"    std",[998,1228,1019],{"class":1012},[998,1230,1231],{"class":1202},"get",[998,1233,1025],{"class":1012},[998,1235,1236],{"class":1004},"0",[998,1238,1239],{"class":1012},">(",[998,1241,1242],{"class":1051},"a",[998,1244,1245],{"class":1012},")",[998,1247,1013],{"class":1012},[998,1249,1250],{"class":1004}," 42u",[998,1252,1253],{"class":1012},";\n",[998,1255,1257,1259,1261,1263,1265,1268,1270,1272,1274,1276],{"class":1000,"line":1256},8,[998,1258,1226],{"class":1008},[998,1260,1019],{"class":1012},[998,1262,1231],{"class":1202},[998,1264,1025],{"class":1012},[998,1266,1267],{"class":1004},"1",[998,1269,1239],{"class":1012},[998,1271,1242],{"class":1051},[998,1273,1245],{"class":1012},[998,1275,1013],{"class":1012},[998,1277,1278],{"class":1012}," true;\n",[998,1280,1282,1285,1288,1291,1294],{"class":1000,"line":1281},9,[998,1283,1284],{"class":1051},"    ProductType b",[998,1286,1287],{"class":1012},"{",[998,1289,1242],{"class":1290},"swJcz",[998,1292,1293],{"class":1012},"};",[998,1295,1296],{"class":1058}," \u002F\u002F 复制构造\n",[998,1298,1300,1302,1304,1307,1310,1312,1314,1316,1318,1320,1322,1325,1327,1330,1333],{"class":1000,"line":1299},10,[998,1301,1226],{"class":1008},[998,1303,1019],{"class":1012},[998,1305,1306],{"class":1051},"cout ",[998,1308,1309],{"class":1012},"\u003C\u003C",[998,1311,1016],{"class":1008},[998,1313,1019],{"class":1012},[998,1315,1231],{"class":1202},[998,1317,1025],{"class":1012},[998,1319,1236],{"class":1004},[998,1321,1239],{"class":1012},[998,1323,1324],{"class":1051},"b",[998,1326,1245],{"class":1012},[998,1328,1329],{"class":1012}," \u003C\u003C",[998,1331,1332],{"class":1012}," \"",[998,1334,1335],{"class":1012}," \"\n",[998,1337,1339,1342,1344,1346,1348,1350,1352,1354,1356,1358,1360,1362,1364,1367],{"class":1000,"line":1338},11,[998,1340,1341],{"class":1012},"              \u003C\u003C",[998,1343,1016],{"class":1008},[998,1345,1019],{"class":1012},[998,1347,1231],{"class":1202},[998,1349,1025],{"class":1012},[998,1351,1267],{"class":1004},[998,1353,1239],{"class":1012},[998,1355,1324],{"class":1051},[998,1357,1245],{"class":1012},[998,1359,1329],{"class":1012},[998,1361,1016],{"class":1008},[998,1363,1019],{"class":1012},[998,1365,1366],{"class":1051},"endl",[998,1368,1253],{"class":1012},[998,1370,1372],{"class":1000,"line":1371},12,[998,1373,1374],{"class":1012},"}\n",[1376,1377,1378],"blockquote",{},[924,1379,1380],{},"有点丑陋，对吧。但目前没有什么更好的写法了。曾经有人向标准委员会提出一些简化的提案，但是委员会专家们对此似乎没有兴趣。",[1079,1382,1384,1386],{"id":1383},"stdtuple-的构造",[920,1385,922],{}," 的构造",[924,1388,1389,1390,1392,1393,1395,1396,1398],{},"从刚才的例子中可以看出，",[920,1391,922],{}," 至少支持默认构造和复制构造。两者都是简单地调用各个成员的默认初始化或复制初始化。但除此之外，",[920,1394,922],{}," 还有其它的构造方式——",[920,1397,922],{}," 拥有整个 C++ 标准库数量最多的构造函数重载，至 C++23 共有 28 个，非常琐碎。",[924,1400,1401],{},"对于我们这种普通用户来说，除了默认构造、复制构造和移动构造这些特殊函数之外，通常只会用到一种“逐成员指定初始化值”的构造方法，比如：",[989,1403,1405],{"className":991,"code":1404,"language":993,"meta":994,"style":994},"#include \u003Ctuple>\nusing ProductType = std::tuple\u003Cunsigned, bool>;\n\nint main() {\n    ProductType a(42u, false);\n    \u002F\u002F [...]\n}\n",[920,1406,1407,1417,1441,1445,1455,1473,1478],{"__ignoreMap":994},[998,1408,1409,1411,1413,1415],{"class":1000,"line":1001},[998,1410,1140],{"class":1139},[998,1412,1143],{"class":1012},[998,1414,1022],{"class":1146},[998,1416,1150],{"class":1012},[998,1418,1419,1421,1423,1425,1427,1429,1431,1433,1435,1437,1439],{"class":1000,"line":1041},[998,1420,1005],{"class":1004},[998,1422,1009],{"class":1008},[998,1424,1013],{"class":1012},[998,1426,1016],{"class":1008},[998,1428,1019],{"class":1012},[998,1430,1022],{"class":1008},[998,1432,1025],{"class":1012},[998,1434,1029],{"class":1028},[998,1436,1032],{"class":1012},[998,1438,1035],{"class":1028},[998,1440,1038],{"class":1012},[998,1442,1443],{"class":1000,"line":1048},[998,1444,1045],{"emptyLinePlaceholder":1044},[998,1446,1447,1449,1451,1453],{"class":1000,"line":1191},[998,1448,1199],{"class":1028},[998,1450,1203],{"class":1202},[998,1452,1206],{"class":1012},[998,1454,1209],{"class":1012},[998,1456,1457,1460,1462,1465,1468,1470],{"class":1000,"line":1196},[998,1458,1459],{"class":1051},"    ProductType ",[998,1461,1242],{"class":1202},[998,1463,1464],{"class":1012},"(",[998,1466,1467],{"class":1004},"42u",[998,1469,1032],{"class":1012},[998,1471,1472],{"class":1012}," false);\n",[998,1474,1475],{"class":1000,"line":1212},[998,1476,1477],{"class":1058},"    \u002F\u002F [...]\n",[998,1479,1480],{"class":1000,"line":1223},[998,1481,1374],{"class":1012},[924,1483,1484],{},"这种构造方法支持类模板实参推导（CTAD），即通过构造函数实参来指定各个分量的类型（模板实参）：",[989,1486,1488],{"className":991,"code":1487,"language":993,"meta":994,"style":994},"#include \u003Ctuple>\n\nint main() {\n    std::tuple a(42u, false);\n    \u002F\u002F a 推导为 std::tuple\u003Cunsigned, bool>\n}\n",[920,1489,1490,1500,1504,1514,1533,1538],{"__ignoreMap":994},[998,1491,1492,1494,1496,1498],{"class":1000,"line":1001},[998,1493,1140],{"class":1139},[998,1495,1143],{"class":1012},[998,1497,1022],{"class":1146},[998,1499,1150],{"class":1012},[998,1501,1502],{"class":1000,"line":1041},[998,1503,1045],{"emptyLinePlaceholder":1044},[998,1505,1506,1508,1510,1512],{"class":1000,"line":1048},[998,1507,1199],{"class":1028},[998,1509,1203],{"class":1202},[998,1511,1206],{"class":1012},[998,1513,1209],{"class":1012},[998,1515,1516,1518,1520,1523,1525,1527,1529,1531],{"class":1000,"line":1191},[998,1517,1226],{"class":1008},[998,1519,1019],{"class":1012},[998,1521,1522],{"class":1051},"tuple ",[998,1524,1242],{"class":1202},[998,1526,1464],{"class":1012},[998,1528,1467],{"class":1004},[998,1530,1032],{"class":1012},[998,1532,1472],{"class":1012},[998,1534,1535],{"class":1000,"line":1196},[998,1536,1537],{"class":1058},"    \u002F\u002F a 推导为 std::tuple\u003Cunsigned, bool>\n",[998,1539,1540],{"class":1000,"line":1212},[998,1541,1374],{"class":1012},[1079,1543,1544],{"id":1544},"引用成员",[924,1546,1547,1549],{},[920,1548,922],{}," 可以持有引用类型的成员。这意味着对这些成员做修改，相当于修改其原先绑定的成员。例如：",[989,1551,1553],{"className":991,"code":1552,"language":993,"meta":994,"style":994},"#include \u003Ctuple>\n#include \u003Ciostream>\n\nint main() {\n    int x{42}, y{56};\n    std::tuple\u003Cint&, int&> t(x, y);\n    std::get\u003C0>(t) = 30;\n    std::get\u003C1>(t) = 50;\n    std::cout \u003C\u003C x \u003C\u003C \" \" \u003C\u003C y \u003C\u003C std::endl;\n}\n",[920,1554,1555,1565,1575,1579,1589,1616,1652,1677,1702,1736],{"__ignoreMap":994},[998,1556,1557,1559,1561,1563],{"class":1000,"line":1001},[998,1558,1140],{"class":1139},[998,1560,1143],{"class":1012},[998,1562,1022],{"class":1146},[998,1564,1150],{"class":1012},[998,1566,1567,1569,1571,1573],{"class":1000,"line":1041},[998,1568,1140],{"class":1139},[998,1570,1143],{"class":1012},[998,1572,1147],{"class":1146},[998,1574,1150],{"class":1012},[998,1576,1577],{"class":1000,"line":1048},[998,1578,1045],{"emptyLinePlaceholder":1044},[998,1580,1581,1583,1585,1587],{"class":1000,"line":1191},[998,1582,1199],{"class":1028},[998,1584,1203],{"class":1202},[998,1586,1206],{"class":1012},[998,1588,1209],{"class":1012},[998,1590,1591,1594,1597,1599,1602,1605,1608,1610,1613],{"class":1000,"line":1196},[998,1592,1593],{"class":1028},"    int",[998,1595,1596],{"class":1051}," x",[998,1598,1287],{"class":1012},[998,1600,1601],{"class":1004},"42",[998,1603,1604],{"class":1012},"},",[998,1606,1607],{"class":1051}," y",[998,1609,1287],{"class":1012},[998,1611,1612],{"class":1004},"56",[998,1614,1615],{"class":1012},"};\n",[998,1617,1618,1620,1622,1624,1626,1628,1631,1634,1637,1640,1642,1645,1647,1649],{"class":1000,"line":1212},[998,1619,1226],{"class":1008},[998,1621,1019],{"class":1012},[998,1623,1022],{"class":1051},[998,1625,1025],{"class":1012},[998,1627,1199],{"class":1028},[998,1629,1630],{"class":1012},"&,",[998,1632,1633],{"class":1028}," int",[998,1635,1636],{"class":1012},"&>",[998,1638,1639],{"class":1202}," t",[998,1641,1464],{"class":1012},[998,1643,1644],{"class":1051},"x",[998,1646,1032],{"class":1012},[998,1648,1607],{"class":1051},[998,1650,1651],{"class":1012},");\n",[998,1653,1654,1656,1658,1660,1662,1664,1666,1668,1670,1672,1675],{"class":1000,"line":1223},[998,1655,1226],{"class":1008},[998,1657,1019],{"class":1012},[998,1659,1231],{"class":1202},[998,1661,1025],{"class":1012},[998,1663,1236],{"class":1004},[998,1665,1239],{"class":1012},[998,1667,1120],{"class":1051},[998,1669,1245],{"class":1012},[998,1671,1013],{"class":1012},[998,1673,1674],{"class":1004}," 30",[998,1676,1253],{"class":1012},[998,1678,1679,1681,1683,1685,1687,1689,1691,1693,1695,1697,1700],{"class":1000,"line":1256},[998,1680,1226],{"class":1008},[998,1682,1019],{"class":1012},[998,1684,1231],{"class":1202},[998,1686,1025],{"class":1012},[998,1688,1267],{"class":1004},[998,1690,1239],{"class":1012},[998,1692,1120],{"class":1051},[998,1694,1245],{"class":1012},[998,1696,1013],{"class":1012},[998,1698,1699],{"class":1004}," 50",[998,1701,1253],{"class":1012},[998,1703,1704,1706,1708,1710,1712,1715,1717,1719,1721,1723,1726,1728,1730,1732,1734],{"class":1000,"line":1281},[998,1705,1226],{"class":1008},[998,1707,1019],{"class":1012},[998,1709,1306],{"class":1051},[998,1711,1309],{"class":1012},[998,1713,1714],{"class":1051}," x ",[998,1716,1309],{"class":1012},[998,1718,1332],{"class":1012},[998,1720,1332],{"class":1012},[998,1722,1329],{"class":1012},[998,1724,1725],{"class":1051}," y ",[998,1727,1309],{"class":1012},[998,1729,1016],{"class":1008},[998,1731,1019],{"class":1012},[998,1733,1366],{"class":1051},[998,1735,1253],{"class":1012},[998,1737,1738],{"class":1000,"line":1299},[998,1739,1374],{"class":1012},[924,1741,1742,1743,1746,1747,1749,1750,1752,1753,1756],{},"这里会输出 ",[920,1744,1745],{},"30 50","，因为对 ",[920,1748,1120],{}," 的两次赋值是对引用——也就是作为 ",[920,1751,1644],{}," 或 ",[920,1754,1755],{},"y"," 的别名——的赋值。",[924,1758,1759,1760,1762,1763,1766,1767,1770,1771,1077],{},"需要注意的一点是，这里必须指明 ",[920,1761,1120],{}," 的类型为 ",[920,1764,1765],{},"std::tuple\u003Cint&, int&>","。如果不指明模板实参，CTAD 会从构造函数实参推导为 ",[920,1768,1769],{},"std::tuple\u003Cint, int>","。为了减少这些代码，C++ 提供了一个简便设施 ",[920,1772,1773],{},"std::make_tuple",[924,1775,1776,1778,1779,1782],{},[920,1777,1773],{}," 在一般的使用上和直接调用构造函数没有区别。但是，如果你用标准库函数 ",[920,1780,1781],{},"std::ref"," 将某个实参引起来，那么它将成为一个引用的初始化值。",[989,1784,1786],{"className":991,"code":1785,"language":993,"meta":994,"style":994},"#include \u003Ctuple>\n\nint main() {\n    unsigned x{42u};\n\n    \u002F\u002F std::tuple\u003Cunsigned, bool>\n    \u002F\u002F 等价于 std::tuple t1(x, false);\n    auto t1 = std::make_tuple(x, false);\n\n    \u002F\u002F std::tuple\u003Cunsigned&, bool>\n    auto t2 = std::make_tuple(std::ref(x), false);\n}\n",[920,1787,1788,1798,1802,1812,1825,1829,1834,1839,1865,1869,1874,1908],{"__ignoreMap":994},[998,1789,1790,1792,1794,1796],{"class":1000,"line":1001},[998,1791,1140],{"class":1139},[998,1793,1143],{"class":1012},[998,1795,1022],{"class":1146},[998,1797,1150],{"class":1012},[998,1799,1800],{"class":1000,"line":1041},[998,1801,1045],{"emptyLinePlaceholder":1044},[998,1803,1804,1806,1808,1810],{"class":1000,"line":1048},[998,1805,1199],{"class":1028},[998,1807,1203],{"class":1202},[998,1809,1206],{"class":1012},[998,1811,1209],{"class":1012},[998,1813,1814,1817,1819,1821,1823],{"class":1000,"line":1191},[998,1815,1816],{"class":1028},"    unsigned",[998,1818,1596],{"class":1051},[998,1820,1287],{"class":1012},[998,1822,1467],{"class":1004},[998,1824,1615],{"class":1012},[998,1826,1827],{"class":1000,"line":1196},[998,1828,1045],{"emptyLinePlaceholder":1044},[998,1830,1831],{"class":1000,"line":1212},[998,1832,1833],{"class":1058},"    \u002F\u002F std::tuple\u003Cunsigned, bool>\n",[998,1835,1836],{"class":1000,"line":1223},[998,1837,1838],{"class":1058},"    \u002F\u002F 等价于 std::tuple t1(x, false);\n",[998,1840,1841,1844,1847,1850,1852,1854,1857,1859,1861,1863],{"class":1000,"line":1256},[998,1842,1843],{"class":1028},"    auto",[998,1845,1846],{"class":1051}," t1 ",[998,1848,1849],{"class":1012},"=",[998,1851,1016],{"class":1008},[998,1853,1019],{"class":1012},[998,1855,1856],{"class":1202},"make_tuple",[998,1858,1464],{"class":1012},[998,1860,1644],{"class":1051},[998,1862,1032],{"class":1012},[998,1864,1472],{"class":1012},[998,1866,1867],{"class":1000,"line":1281},[998,1868,1045],{"emptyLinePlaceholder":1044},[998,1870,1871],{"class":1000,"line":1299},[998,1872,1873],{"class":1058},"    \u002F\u002F std::tuple\u003Cunsigned&, bool>\n",[998,1875,1876,1878,1881,1883,1885,1887,1889,1891,1894,1896,1899,1901,1903,1906],{"class":1000,"line":1338},[998,1877,1843],{"class":1028},[998,1879,1880],{"class":1051}," t2 ",[998,1882,1849],{"class":1012},[998,1884,1016],{"class":1008},[998,1886,1019],{"class":1012},[998,1888,1856],{"class":1202},[998,1890,1464],{"class":1012},[998,1892,1893],{"class":1008},"std",[998,1895,1019],{"class":1012},[998,1897,1898],{"class":1202},"ref",[998,1900,1464],{"class":1012},[998,1902,1644],{"class":1051},[998,1904,1905],{"class":1012},"),",[998,1907,1472],{"class":1012},[998,1909,1910],{"class":1000,"line":1371},[998,1911,1374],{"class":1012},[1376,1913,1914],{},[924,1915,1916,1917,1919,1920,1077,1923,1925,1926,1928],{},"具体而言，",[920,1918,1781],{}," 函数返回一个保有原对象指针的类 ",[920,1921,1922],{},"std::reference_wrapper",[920,1924,1773],{}," 对 ",[920,1927,1922],{}," 有特殊的处理。",[1079,1930,1931],{"id":1931},"注意事项",[924,1933,1934,1935,1937],{},"尽管数学家热爱 ",[920,1936,922],{},"，但是在编写代码时，素质优秀的程序员应当减少它们的使用。原因很简单——现实世界的事物是有意义而非抽象的。举一个例子：",[989,1939,1940],{"className":991,"code":994,"language":993,"meta":994,"style":994},[920,1941,1942],{"__ignoreMap":994},[998,1943],{"class":1000,"line":1001},[1945,1946,1947],"style",{},"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 .sMK4o, html code.shiki .sMK4o{--shiki-light:#39ADB5;--shiki-default:#89DDFF;--shiki-dark:#89DDFF}html pre.shiki code .spNyl, html code.shiki .spNyl{--shiki-light:#9C3EDA;--shiki-default:#C792EA;--shiki-dark:#C792EA}html pre.shiki code .sTEyZ, html code.shiki .sTEyZ{--shiki-light:#90A4AE;--shiki-default:#EEFFFF;--shiki-dark:#BABED8}html pre.shiki code .sHwdD, html code.shiki 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.swJcz, html code.shiki .swJcz{--shiki-light:#E53935;--shiki-default:#F07178;--shiki-dark:#F07178}",{"title":994,"searchDepth":1001,"depth":1041,"links":1949},[1950,1952,1954,1955],{"id":1081,"depth":1041,"text":1951},"访问 std::tuple 的分量",{"id":1383,"depth":1041,"text":1953},"std::tuple 的构造",{"id":1544,"depth":1041,"text":1544},{"id":1931,"depth":1041,"text":1931},"std::tuple 是一个类模板。","md",null,{},{"icon":696},{"title":710,"description":1956},"HtI780tkysQthY4ErFFj6I8YJ2ehvB2wf_4fREuEQnc",[1964,1966],{"title":706,"path":707,"stem":708,"description":1965,"icon":696,"children":-1},"在范畴论中经常会谈起这种特殊的类型—— 0 类型。",{"title":714,"path":715,"stem":716,"description":1967,"icon":696,"children":-1},"通用和类型 std::variant",1784618136711]