getting object in each element in vector

Is there a way for an iterator to return an object in each element of a C++ Standard Library vector?

I have this code:

struct mystruct {
  int field1;
}

int DoSomethingWithMyStruct(mystruct& a);

std::vector<mystruct> myVector;
std::vector<mystruct&开发者_高级运维gt;::iterator it;

mystruct s1,s2, temp;
s1.field1=1;
s2.field1=2;

for (it=myVector.begin();it!=myVector.end();it++)
{
   //I want to call DoSomethingWithMyStruct, so I have to pass in mystruct object.
   //can I use iterator to get the object of each element in myVector without having to create a temporary mystruct object and pass it in?
   //I'm looking for an easier way than having to do this:
   temp.field1 = it->field1;
   DoSomethingWithMyStruct(temp);

}

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As well as what the others said, you can do this instead:

#include <algorithm>

std::for_each(myVector.begin(), myVector.end(), DoSomethingWithMyStruct);

It's short and succinct. No need of manual loop.

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Yes:

DoSomethingWithMyStruct(*it);

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Just dereference the iterator, surely:

std::vector<mystruct>::iterator it, end;
for (it = myVector.begin(), end = myVector.end(); it != end; ++it) {
   DoSomethingWithMyStruct(*it);
}

Or am I missing something here...?

Going further, there are other ways to iterate. You could use BOOST_FOREACH or C++0x ranged-for to simplify the loop. You could also use an algorithm like std::for_each to remove it entirely!

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^{(Remember that it->field1 is like (*it).field1, so you're already doing this... even though you're going on to make your code more complicated than is necessary afterwards!)}

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Just simply dereference your iterator. *it, and you get a mystruct. They behave like pointers in this regard.

But in the case if you wonder how to iterate over all fields of all elements of a vector, where the elements are polymorphic; e.g. std::vector<Base*>, it's a bit more difficult. Since C++ doesn't have reflection that would make this possible (semi)automatically, you need to do it manually. Something similar to the Visitor Pattern comes to mind.

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1. You have not populated myVector

2. Could make code more efficent like this

   std::vector<mystruct>::const_iterator theEnd;

   for (it=myVector.begin();it!=theEnd;++it)

   Notice the position of the ++

3. I think that &(*it) should work.