C / C++ / MFC

EQ Learner14-Aug-13 6:13

EQ Learner

14-Aug-13 6:13

Ok, to be more specific, I have redefined the otherclass to enable it has an << operator:

C++

class otherclass
{
public:
	otherclass(void):i(0)	{}

	friend std::ostream & operator << (std::ostream & os, otherclass &Obj)
	{
		os << Obj.i;
		return (os);
	}

	int i;
};

In the Serialize_SFINAE name space, I modified it to handle the otherclass serialization:

C++

namespace Serialize_SFINAE
{
    template <typename T>
    auto Serialize(T& obj, std::ostream &os) -> decltype(obj.Serialize(os),void())
    {
        obj.Serialize(os);
    }
 
    // fallback method
    template <typename T>
    void Serialize( T& obj, std::ostream &os, ...)
    {
        // replace this with valid code if you want to handle this error at runtime instead of compile time
//        obj.this_class_doesnt_have_a_serialize_method;

		os << obj;
    }
}

So now the program can handle the otherclassserialization. However, when switch back to myclass, compiler generate an ambiguous call message: error C2668: 'Serialize_SFINAE::Serialize' : ambiguous call to overloaded function

So what should the second Serialize(..) within that name space be in order to handle the object without Serialize internally implemented?

pasztorpisti14-Aug-13 8:29

14-Aug-13 8:29

Well, you actually changed the signature of the Serialize method. You are not allowed to do that. If you want to be able to access a stream for this purpose then put both of these methods into a class instead, store a stream reference/pointer in the class, create an instance of that class and call these sfinae methods of the instance. This way you don't have to change the signature of the sfinae methods. A simpler less nice alternative is not changing the methods but accessing the stream from a global variable.

EQ Learner14-Aug-13 8:57

EQ Learner

14-Aug-13 8:57

Good. That's clarify what I thought and is what I planed to do after the last post.

Thanks again for your kind explanations.

pasztorpisti14-Aug-13 9:29

how can i improve my c programming in different ways

14-Aug-13 9:29

You are welcome!

Member 985748713-Aug-13 2:18

Member 9857487

13-Aug-13 2:18

good evening

Re: how can i improve my c programming in different ways

NotPolitcallyCorrect13-Aug-13 2:29

NotPolitcallyCorrect

13-Aug-13 2:29

Member 9857487 wrote:

good evening

Good evening. Just saying "good evening" is not a question or a description of a problem. Please read http://www.codeproject.com/Messages/2922875/HOW-TO-ASK-A-QUESTION.aspx

Re: how can i improve my c programming in different ways

CPallini13-Aug-13 2:32

CPallini

13-Aug-13 2:32

Good afternoon.

Quote:
how can i improve my c programming in different ways?

Coding. Reading good books. Coding. Coding. (did I say 'coding'?).

Veni, vidi, vici.

Re: how can i improve my c programming in different ways

pasztorpisti13-Aug-13 3:29

Re: how can i improve my c programming in different ways

13-Aug-13 3:29

Someone on these forums told me that there is a difference in quality between a coder and a programmer. I wish OP to become a programmer, a software engineer. Programming. Programming. Software engineering. Software engineering. Design. Design. Smile | :)

I see the point of OP, he is probably searching for motivators but the first thing to write as a beginner programmer is not a monumental masterpiece and usually not even useful application. Becoming able to write something monumental and/or useful (like a compiler, an operating system kernel, a serious game) requires years of experience - the way is quite long and many "wannabe" programmers don't realize that this can be achieved only by enjoying the way. Many starters give up and some of them reach only the level of a bad programmer usually without satisfactory software design knowledge.

pasztorpisti13-Aug-13 3:15

Re: how can i improve my c programming in different ways

13-Aug-13 3:15

Back in the early years of my programming career I started with asm programming. I still remember how happy I was when I first put together a "for loop" in an assembly program (at home, I wasn't forced by teachers). It was something that read in some input from the keyboard and then printed it the the screen when the enter key was pressed or something similarly stupid stuff. In assembly even this simple program was a challenge for me despite the fact that it was only a stupid for loop (I didn't even knew that it was a for loop, I only knew that I require a few jumps and condition checking). You have to search for a challange that keeps you motivated but isn't too far beyond what you can achieve with your current knowledge. If that knowledge is zero then the first step is reading books and the code of others'. Don't try to skip reading 1-2 books on C programming, you will regret it and you will waste a lot of time by progressing with much slower speed by doing nothing because of being able to do nothing without the necessary basic knowledge. I can easily imagine that you think your biggest problem is the C programming language itself but you should quickly realize that the language itself is only a tool and the real value is the experience you gain by solving problems. Every language of the same paradigm contains the same basic constructs (loops, functions, classes, ...). The sooner you get through the learning of your first language (for example C) the sooner you can start with solving real-world problems and gaining experience in software design that is much more important than being able to produce compilable lines of code in a language. Without experience even the smallest problems seem to be unsolvable, it requires 1-2 years spent with valuable programming to learn the basic patterns (for example how to read in data and parse it, how to manage memory, ...) in order to be able to handle these naturally without effort by concentrating your efforts on solving the real problems built on top of the simple patterns.

Erudite_Eric13-Aug-13 4:33

Erudite_Eric

13-Aug-13 4:33

Uh oh, its the pastapizza daily novel!

Hey, did you ever hear what paragraphs are? Try using them occasionally.

--edit--

I see a sense of humour is lacking in some.

modified 21-Aug-13 10:57am.

Re: how can i improve my c programming in different ways

CPallini13-Aug-13 9:17

CPallini

13-Aug-13 9:17

(but scaring at first sight Smile | :)

)

Veni, vidi, vici.

Re: how can i improve my c programming in different ways

pasztorpisti13-Aug-13 9:22

Re: how can i improve my c programming in different ways

13-Aug-13 9:22

I'm good at writing scaring paragraphs. I have always been terrible in literature, grammar and similar things... Smile | :)

Erudite_Eric13-Aug-13 4:35

Erudite_Eric

13-Aug-13 4:35

No no no no no!

It doesnt go 'Good Evening' it goes 'Hello World!'

Dear oh dear, how are you ever going to learn if you dont get this right!

Re: how can i improve my c programming in different ways

CPallini13-Aug-13 9:18

CPallini

13-Aug-13 9:18

Veni, vidi, vici.

Re: how can i improve my c programming in different ways

jschell13-Aug-13 8:46

jschell

13-Aug-13 8:46

Member 9857487 wrote:

how can i improve my c programming in different ways

Learn how compilers and linkers work. That knowledge will increase your understanding of how the C language works.

c++ with QT exe file error

Mkhitar_Sargsyan12-Aug-13 21:08

Mkhitar_Sargsyan

12-Aug-13 21:08

Hello. I'm trying to open exe file , but there is a problem like this:
<<assert failure="" in="" qlist::operator[="" ]:="" "index="" out="" of="" range",="" file="" c:\qt\4.8.1\include\qtcore\..="" ..="" src="" corelib="" tools="" qlist.h,="" line="" 477="">>

but I can compile without debuging or I can debug it, and there is no problem; it works correctly:

what is it a problem at time opening exe file?

thanks for attention

Richard MacCutchan12-Aug-13 22:05

Richard MacCutchan

12-Aug-13 22:05

Please do not create multiple accounts in order to post the same question twice.

Use the best guess

SoMad12-Aug-13 22:43

SoMad

12-Aug-13 22:43

Possibly the worst sock puppetry act ever. $Shucks | :-\$

Soren Madsen

"When you don't know what you're doing it's best to do it quickly" - Jase #DuckDynasty

Erudite_Eric13-Aug-13 0:18

Erudite_Eric

13-Aug-13 0:18

How dense can you be? Its the value you are passing to the Qlist::[] opperator! Its telling you that it is too big!

Holy crap, I wish I had error messages this easy.

If you dont understand that accessing member 2909483625284948 of a 22 member array is a bad thing then go get another job.