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不暴露具体类型，因此实现了类型擦除。",[925,1711,1712],{"id":1712},"与模板静态多态的区别",[1714,1715,1716,1731],"table",{},[1717,1718,1719],"thead",{},[1720,1721,1722,1726,1728],"tr",{},[1723,1724,1725],"th",{},"特性",[1723,1727,897],{},[1723,1729,1730],{},"模板静态多态",[1732,1733,1734,1746,1761],"tbody",{},[1720,1735,1736,1740,1743],{},[1737,1738,1739],"td",{},"类型信息",[1737,1741,1742],{},"运行时隐藏",[1737,1744,1745],{},"编译期确定",[1720,1747,1748,1751,1758],{},[1737,1749,1750],{},"容器内混合类型",[1737,1752,1753,1754,1757],{},"可以（如 ",[930,1755,1756],{},"std::vector\u003CAnimal>","）",[1737,1759,1760],{},"不行（除非手动擦除）",[1720,1762,1763,1766,1769],{},[1737,1764,1765],{},"开销",[1737,1767,1768],{},"通常有堆分配和虚调用",[1737,1770,1771],{},"零开销",[918,1773,1774,1775,1778,1779,1781],{},"类型擦除牺牲了部分性能，换取了运行时的灵活性。标准库中的 ",[930,1776,1777],{},"std::any","、",[930,1780,932],{},"、多态分配器都是典型应用。",[1783,1784,1785],"style",{},"html pre.shiki code .s7zQu, html code.shiki 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