Home/ Questions/Resolved the problem of the request for member which is of non-class type in c++
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Juliana Gelbero
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Asked: 2022-05-18T16:32:52+00:00 In:

Resolved the problem of the request for member which is of non-class type in c++

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Here is the program I run:

class Foo
 {
  public:
  Foo() {};
  Foo(int a) {};
  void bar() {};
 };
 
 int main()
 {
  // this works...
  Foo foo1(1);
  foo1.bar();
 
  // this does not...
  Foo foo2();
  foo2.bar();
 
  return 0;
 }

After I run, it returns an error:

nonclass.cpp: In function ‘int main(int, const char**)’:
 nonclass.cpp:17: error: request for member ‘bar’ in ‘foo2’, which is of non-class type ‘Foo ()()’

Does anyone have any suggestions for the problem below: request for member which is of non-class type in C++ in the cpp – How to correct it?

request for member
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2 Answers

  1. Best Answer
    Expert

    The cause:

    This error happens due to the compiler considers

    Foo foo2();

    as a function declaration with the name “Foo2” and “Foo” is the return type. In this case, it is not essential to use parenthesis for instantiating a class object when you don’t want to use a parameterised constructor.

    Solution:

    Your error can be solved by the way removing the parenthesis from the variable declaration and write as below:

    Foo foo2;
    • 22

  2. For the record.

    This is not the solution for your code. However, I received the exact same error message when incorrectly accessing a method of a class instance pointed at by myPointerToClass, e.g. 

    MyClass* myPointerToClass = new MyClass();
myPointerToClass.aMethodOfThatClass();

    Where 

    myPointerToClass->aMethodOfThatClass();

    It would be obvious that this is correct.

    • 19

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