为什么函数对象比函数指针更好？
Why are function objects better than function pointers?
来自 Wikipedia - Function object
A typical use of a function object is in writing callback functions. A callback in procedural languages, such as C, may be performed by using function pointers.[2] However it can be difficult or awkward to pass a state into or out of the callback function. This restriction also inhibits more dynamic behavior of the function. A function object solves those problems since the function is really a façade for a full object, carrying its own state.
为什么函数指针很难将状态传入或传出回调函数和函数的动态行为?
如果函数不使用函数指针程序如何调用函数
就C中的函数指针而言，您需要将状态作为额外参数传递。这与 python、javascript 或 C++ 等具有闭包的语言相反。这意味着需要考虑额外结构的存储持续时间。
C 程序员做 使用函数指针。如果不使用函数指针，您将无法编写非常通用的代码。我们只是应用纪律并将捕获的状态作为函数参数传递到结构中。
来自 Wikipedia - Function object
A typical use of a function object is in writing callback functions. A callback in procedural languages, such as C, may be performed by using function pointers.[2] However it can be difficult or awkward to pass a state into or out of the callback function. This restriction also inhibits more dynamic behavior of the function. A function object solves those problems since the function is really a façade for a full object, carrying its own state.
为什么函数指针很难将状态传入或传出回调函数和函数的动态行为?
如果函数不使用函数指针程序如何调用函数
就
C中的函数指针而言，您需要将状态作为额外参数传递。这与 python、javascript 或 C++ 等具有闭包的语言相反。这意味着需要考虑额外结构的存储持续时间。C 程序员做 使用函数指针。如果不使用函数指针，您将无法编写非常通用的代码。我们只是应用纪律并将捕获的状态作为函数参数传递到结构中。