另一份算法 [英] another copy algorithm

问题描述

我有两个向量。

vector<Object> objects;
vector<string> names;

这两个向量填充并具有相同的尺寸。
我需要一些算法不分配给对象变量。这可能是使用boost ::拉姆达。
比方说：

These two vectors are populated and have the same size. I need some algorithm which does assignment to the object variable. It could be using boost::lambda. Let's say:

some_algoritm(objects.begin(), objects.end(), names.begin(), bind(&Object::Name, _1) = _2);

任何建议？

推荐答案

我想不出一个的std :: 算法这一点。但是，你总是可以编写自己的：

I can't think of a std:: algorithm for this. But, you can always write your own:

template < class It1, class It2, class Operator >
  It2 zip_for_each ( It1 first1, It1 last1,
                         It2 result, Operator op )
{
  while (first1 != last1)
    op(*first++, *result++);
  return result;
}

---

修改：另一种选择，如果你能够定义运算符= 适当，是的std ::复制：

---

EDIT: Another alternative, if you are able to define operator= appropriately, is std::copy:

#include <vector>
#include <string>

struct Object {
  std::string name;
  int i;
  void operator=(const std::string& str) { name = str; }
};

int main () {
  std::vector<Object> objects(3);
  std::vector<std::string> names(3);

  names[0] = "Able";
  names[1] = "Baker";
  names[2] = "Charlie";

  std::copy(names.begin(), names.end(), objects.begin());
}

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