C ++如何遍历结构列表并访问它们的属性 [英] C++ How to loop through a list of structs and access their properties

问题描述

  list< string> :: iterator Iterator; 
 for（Iterator = AllData.begin（）; 
 Iterator！= AllData.end（）; 
 Iterator ++）
 {
 cout<< \t+ * Iterator +\\\
; 
} 
  

但是我怎么能这样做？

  list< CollectedData> :: iterator Iterator; 
 for（Iterator = AllData.begin（）; 
 Iterator！= AllData.end（）; 
 Iterator ++）
 {
 cout<< \t+ * Iterator.property1 +\\\
; 
 cout<< \t+ * Iterator.property2 +\\\
; 
 
 
 
 
 
 $ b 
如果有人能解释如何用 for_each 循环，这也是非常有帮助的，但是从我读过的内容来看似乎更加复杂了。
 
 
 
非常感谢 
 
解决方案    Iterator->属性您的第一次尝试几乎是正确的，由于运算符优先级，它只需要一些括号：（* Iterator）.property  
 
 
 
为了使用for_each，你必须把cout语句提升到一个函数或函子中，如下所示： 
 
 
  void printData AllDataType& data）
 {
 cout<< \ t+ data.property1 +\\\
; 
 cout<< \ t+ data.property2 +\\\
; 
 
 
 for_each（AllData.begin（），AllData.end（），printData）; 
  
 
I know I can loop through a list of strings like this:
list<string>::iterator Iterator;
 for(Iterator = AllData.begin(); 
   Iterator != AllData.end();
   Iterator++)
 {
  cout << "\t" + *Iterator + "\n";
 }
but how can I do something like this?
list<CollectedData>::iterator Iterator;
 for(Iterator = AllData.begin(); 
   Iterator != AllData.end();
   Iterator++)
 {
  cout << "\t" + *Iterator.property1 + "\n";
  cout << "\t" + *Iterator.property2 + "\n";
 }
or if someone can explain how to do this with a for_each loop, that would be very helpful as well, but it seemed more complicated from what I've read.


thank you so much
解决方案
It's as easy as Iterator->property.  Your first attempt is almost correct, it just needs some parentheses due to operator precedence: (*Iterator).property

In order to use for_each, you would have to lift the cout statments into a function or functor like so:
void printData(AllDataType &data)
{
    cout << "\t" + data.property1 + "\n";
    cout << "\t" + data.property2 + "\n";
}

for_each(AllData.begin(), AllData.end(), printData);


                        
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