如何在C ++中进行curry？ [英] How can currying be done in C++?

问题描述

什么是currying？

What is currying?

如何在c ++中进行currying？

How currying can be done in c++?

容器？

推荐答案

简单来说，currying需要一个函数 f（x，y）并给定一个固定的 Y ，给出一个新函数 g（x）其中

In short, currying takes a function f(x, y) and given a fixed Y, gives a new function g(x) where

g(x) == f(x, Y)

$ b

这个新函数可以在只提供一个参数的情况下调用，并将调用传递给原来的 f 函数， Y 参数。

STL中的绑定器允许您对C ++函数执行此操作。例如：

The binders in the STL allow you do to this for C++ functions. For example:

#include <functional>
#include <iostream>
#include <vector>

using namespace std;

// declare a binary function object
class adder: public binary_function<int, int, int> {
public:
    int operator()(int x, int y) const
    {
        return x + y;
    }
};

int main()
{
    // initialise some sample data
    vector<int> a, b;
    a.push_back(1);
    a.push_back(2);
    a.push_back(3);

    // here we declare a function object f and try it out
    adder f;
    cout << "f(2, 3) = " << f(2, 3) << endl;

    // transform() expects a function with one argument, so we use
    // bind2nd to make a new function based on f, that takes one
    // argument and adds 5 to it
    transform(a.begin(), a.end(), back_inserter(b), bind2nd(f, 5));

    // output b to see what we got
    cout << "b = [" << endl;
    for (vector<int>::iterator i = b.begin(); i != b.end(); ++i) {
        cout << "  " << *i << endl;
    }
    cout << "]" << endl;

    return 0;
}

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