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From: Ian Collins <ian-news@hotmail.com>
Newsgroups: comp.lang.c++
Subject: Re: Help needed
Date: Sun, 5 Apr 2020 07:35:11 +1200
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Xref: csiph.com comp.lang.c++:72811

On 05/04/2020 02:33, Ned Latham wrote:
> Alf P. Steinbach wrote:
> 
>> Here's an example:
>>
>>
>> #include <iostream>
>> using namespace std;        // Do this to get roughly pre-standard behavior.
> 
> Not me. Namespace is beyond the pale.
> 
>> struct Non_native
>> {
>>       double amount;
>>
>>       operator double() const { return amount; }
> 
> What's this for? It's not used, below.

It is.

>>
>>       void advance()
>>       {
>>           amount += 0.01;
>>       }
>>
>>       Non_native operator++( int )
> 
> double is non-native?
> 
>>       {
>>           Non_native result = *this;
>>           advance();
>>           return result;
>>       }
>> };
>>
>> int main()
>> {
>>       Non_native o = {3.14};
>>
>>       cout << "Originally " << o++ << "." << endl;
>>       cout << "After: " << o << "." << endl;
>> }
> 
> I'm not even going to try it, Alf, And I bet you haven't done so.
> That code requires overload operators = and << for the struct.
> 

No, it doesn't.  The code compiles and behaves exactly as intended and 
your inability to comprehend it clearly demonstrates what I thought all 
along, you are clueless.

-- 
Ian.