August 2021
Intermediate to advanced
450 pages
6h 57m
Chinese
Content preview from C++程序设计语言（第4部分：标准库）（原书第4版）
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33.5 函数适配器
函数适配器接受一个函数参数，返回一个可用来调用该函数的函数对象。
适配器bind（）和mem_fn（）进行实参绑定，也称为柯里化（Currying）或部分求值（partial evaluation）。这些绑定器和那些已被弃用的前身（如bind1st（）、mem_fun（）和mem_fun_ref（））在过去曾被广泛使用，但大多数应用看起来可以用lambda很容易地表达（见11.4节）。
33.5.1 bind（）
给定一个函数和一组实参，bind（）生成一个可用该函数“剩余”实参（如果存在的话）调用的函数对象。例如：
调用cube2（）会用实参2调用cube，即cube（2）。我们不必绑定所有函数实参。例如：
绑定器奇怪的实参_1是一个占位符，它告知bind（）实参在结果函数对象中应放在什么位置。在本例中，g（）的（第一个）实参被用作f（）的第二个实参。
占位符定义在命名空间std：：placeholders中，该命名空间是头文件<functional>的一部分。占位符机制非常灵活，考虑下面的代码： ...
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