c++ - Accessing variable of class normally or by a function -

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• do getters , setters impact performance in c++/d/java? 10 answers

class abc{      public :       int a;      public :       int getdata(){         return a;       }      }      void main()      {         abc abc;        cout<< abc.a;    //1        cout<<abc.getdata();//2      } 

now if i'm accessing variable "a" in case compiler take less time access 'a'. guess first case not sure.

the 2 methods not strictly equivalent:

1. directly accessing member reads value of member while
2. the method returns copy of variable, read copy such.

with regards performance ofcourse #1 should faster since no copy involved, modern compilers apply copy elision remove copy being created.

rather performance should consider uniformity of coding guidelines followed in organization/institute.