Article ID: 149324
Article Last Modified on 7/5/2005
APPLIES TO
- Microsoft Visual C++ 4.0 Standard Edition
- Microsoft Visual C++ 4.1 Subscription
- Microsoft Visual C++ 4.2 Enterprise Edition
- Microsoft Visual C++ 4.2 Professional Edition
- Microsoft Visual C++ 5.0 Enterprise Edition
- Microsoft Visual C++ 5.0 Professional Edition
This article was previously published under Q149324
SYMPTOMS
The compiler generates the following error when you invoke a non-const member function on a const object:
However, it does not generate this error when you invoke a non-const member function on a const object that is returned by a function.
RESOLUTION
To work around this problem, make the function return a reference to const.
STATUS
This bug was corrected in Microsoft Visual C++, version 6.0.
MORE INFORMATION
Sample Code
/* Compile options needed: None
*/
truct A {
int m_i;
A() { m_i = 0; };
void Set() {m_i = 5;}
};
truct B {
A m_a;
// Change the return type to 'const A &' to work around
const A GetMember() const {return m_a;}
};
void TestFunc(const B & b)
{
const A a;
// Next line correctly generates:
// error C2662: 'Set' : cannot convert 'this' pointer from
// 'const struct A *' to 'struct A *const '
// a.Set(); // Uncomment this line to get the error
// Next line does not generate the error even though
// B::GetMember returns const A object.
// Change the return type of B::GetMember to 'const A &'
// to get the error.
b.GetMember().Set();
}
void main()
{
B b;
TestFunc(b);
}
Keywords: kbbug kbfix kbvc600fix KB149324
