UPDATE CLOSED error: declaration of anonymous class must be a definition

[Lost User]

This post original subject - error: declaration of anonymous class must be a definition was caused by this class declaration

< class REG_EXP //regular_expression_class
{
int a;
QString text;
QString RegExp;
QString Analyze;
} TEST_REG_EXP;
/pre>

Search for the symbol "REG_EXP" in the entire project returned no result.
The conclusion
it is unknown why the error was posted.
Please consider this matter closed.

[k5054]

What the compiler is trying to tell you is that you have an invalid function definition, namely

void PassTrace(class *Pointer);

Think about that a little bit. What is the type of Pointer? If your definition of PassTrace (i.e. the place where you provide the code for the function) matches the given declaration, how would you access any of Pointer's members? Does the class have member a, or a member name, value? There's no way to know. Perhaps you meant

void PassTrace(Test *Pointer)

or maybe you want a Template?

template
void PassTrace
{
// body of function
}

If you know that you'll never need to test *Pointer for null, you might consider using a reference rather than a pointer, and if you're not going to change the contents of what Pointer points to, then consider marking it as const as well. Other than that, passing a pointer to a class (or struct) is no different that passing a pointer to anything else:

class myClass {
// class members ...
};

void f(myClass *pointer)
{
// function body
}

int main()
{
myClass c;
// instantiate c's data members
f(&c); // call f with a pointer to object of type myClass
}

"A little song, a little dance, a little seltzer down your pants" Chuckles the clown

[Lost User]

Thank you, appreciate your reply. I did JUST modify my working test function and do not see why my definition is wrong. I am obviously missing something VERY basic here. Should it work this way ? void BT_Utility_Library::PassTrace(class *) // { // //qDebug()< // void BT_Utility_Library::PassTrace(class *Pointer) // { // //qDebug()<

[Lost User]

void BT_Utility_Library::PassTrace(class *)

You cannot have a pointer that has no definition. The class keyword is usaed to define an actual class, whether abstract or not. In the definition above the pointer must be of an actual class so the compiler knows what to do with any statements that use it.

[RedDk]

Sorry, what was the question?:thumbsdown:

[k5054]

consider:

class A { /* ... */ }
class B { /* ... */ }
class C { /* ... */ }

void f(class *ptr);

Which class does ptr refer to in void f(class *ptr)? The definition of void f(class *ptr) makes as much sense as void f(const i). There's no type associated with the parameter, so the compiler does not know what type the parameter is. Note: The use of class or struct for a variable/parameter declaration is optional in C++ :

class C { /* ... */ }
int main()
{
class C c1;
C c2;
}

the declarations of c1 and c2 are both valid, and both declare a object of type class C

"A little song, a little dance, a little seltzer down your pants" Chuckles the clown

[Lost User]

error: declaration of anonymous class must be a definition and do not known how and where to correct this error. STAND BY I have another fish to fry and I need to rebuild this task from scratch. I took a wrong approach and that is why I got this error.