c++ - Can someone explain this code for me please? -

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I am trying to understand what is the comparison of an Ieterter?: Can anyone please explain in the code given below is? Thanks in advance 

  Maps & lt; String, cvsvm & gt; Classes_classifiers = predictor.getClassesClassifiers (); Map & LT; String, the map & lt; String, integer & gt; & Gt; confusion matrix; (Map  CvSVM> gt; :: iterator = class_classifiers.begin (); it! = Classes_classifiers.end (); ++ this) {for (string, cvsvm> gt; :: iterator it1 = classes_classifiers Begin;); It1! = Classes_classifiers.end (); ++ it1) {string class1 = ((* this) .first.compare ("Foods") == 0)? "People": (* this). First; String Class 2 = ((* it1) .first.compare ("Foods") == 0)? "People": (* it1). First; Illusion _matrix [class 1] [class 2] = 0; }}

This can be written in a less vague way 

  it-> ago == "Foods"? "People": this-> first; Since   
 returns  string :: comparison  if string is equal to logic. 
 
  it-> first  is the key from the key-value pair in which the iterator is mentioned, this key returns, but it changes to  "people"  Is, if it was  "Foods" .

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