C1842: [ incompatible types

[ incompatible types [ERROR]

Binary operator [: There was no global operator defined, which takes the type used.

  struct A {

  

    int j;

  

    int operator [] (A a);

  

  };

  

  void main() {

  

    A a;

  

    int i;

  

    int b[3];

  

    i=a[a];  // ok

  

    i=b[a];  // error

  

  }

  

Use a type compatible to ì[ì. If there is no global operator for [, take an integer type.