Re: What do you call this construct?

"Victor Bazarov" <>
Tue, 27 Feb 2007 15:08:46 -0500
joe wrote:

Curious if this type of construct has a name, or is a recognized
design pattern:

class Function
Function() { // do loads of work here in the Constructor, store result
in m_result }

operator double() { return m_result;} //Automatic Type Conversion

double m_result;

with the expected simple usage:

double value = Function();

Is there some recognized caveat to the above? I don't see it used
very often.

What's the advantage of that class implementation over, say,

    double Function() {
        double _result;
        // do loads of work here, store the result in _result
        return _result;

? I don't see any in your code. And the syntax looks pretty much
like a function call, so it would be very confusing to somebody
reading the code to learn that 'Function' is not a function at all.

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