class CVector3 {
public:
...
    inline operator double* ()    { return v; }                           //(*)
    inline bool operator == (const CVector3& rhs)    { return false; }       //(**)
...
    double v[3];
};

    CVector3 v1, v2;
    ...
    if ( v1 == v2 )     (***)
        ...

RTT>class CVector3 {
RTT>public:
RTT>...
RTT>    inline operator double* ()    { return v; }                           //(*)
RTT>    inline bool operator == (const CVector3& rhs) const    { return false; }       //(**)
RTT>...
RTT>    double v[3];
RTT>};
RTT>

RTT>    CVector3 v1, v2;
RTT>    ...
RTT>    if ( v1 == v2 )     (***)
RTT>        ...
RTT>

#include <iostream>

class CVector3 {
public:
  inline operator double* () { std::cout << "1"; return v; }                           //(*)
  inline bool operator == (const CVector3& rhs) const { std::cout << "2";  return false; }       //(**)
  double v[3];
};

int main()
{
    CVector3 v1, v2;
     v1 == v2;
}