Re: address of virtual member function passed as template argument

"Igor Tandetnik" <>
Mon, 19 Mar 2007 12:03:58 -0400
<etcVaEkaHHA.2436@TK2MSFTNGP06.phx.gbl> wrote:

It's a pitty that there are no std c++ properties.

You can mimic them to some extent. Here's a rough draft:

class PropertyObserver {
    virtual void PropertyChanged() = 0;

template <typename T>
class PropertyHolder {
    PropertyHolder(PropertyObserver* observer) : observer_(observer) {}
    operator T() const { return property_; }
    const PropertyHolder& operator=(const T& p) {
        property_ = p;
        return *this;
    // Other operators and constructors left as an exercise for the
    T property_;
    PropertyObserver* observer_;

class ClassWithIntProperty : private PropertyObserver {
    void PropertyChanged() {}
    PropertyHolder<int> my_property;

    ClassWithIntProperty() : my_property(this) {}

// Usage
ClassWithIntProperty c;
c.my_property = 1; // triggers c.PropertyChanged
int n = c.my_property;

With best wishes,
    Igor Tandetnik

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