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Passing an ArrayCtrl / SqlArray to a function template [message #49276]

Mon, 15 January 2018 11:51

Giorgio
Messages: 218
Registered: August 2015

Experienced Member

Hi folks,
I am creating a small util library for my applications (actually, is a namespace).

I use frequently a method to export the content of a SqlArray /ArrayCtrl to a csv file, so it makes sense to include it in this library.

template <class T>
	void ExportCSV(T o)
	{
		String filename = "";
		FileSel fs;
	
		CoInitialize(NULL);
		PWSTR path = 0;
		SHGetKnownFolderPath(FOLDERID_Desktop, KF_FLAG_SIMPLE_IDLIST, NULL, &path);
		std::wstring s = path;
		std::string homedir( s.begin(), s.end() );
		homedir.append("\\");
		CoTaskMemFree(path);
		
		fs.Type("CSV", "*.csv");
		fs.PreSelect(homedir);
		if(!fs.ExecuteSaveAs()) return;
		filename = fs;
		SaveFile(filename, "Prova");
		FileOut out(filename);
		if(!out) {
			Exclamation(t_("Failed opening ") + filename);
			return;
		}
		
		out.Put(o.AsCsv());
	}

When I compile I get the following error:

error C2280: 'Upp::ArrayCtrl::ArrayCtrl(Upp::ArrayCtrl &)': attempting to reference a deleted function

I know this is a really generic question, but I am bit lost.

Regards,
Gio

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Re: Passing an ArrayCtrl / SqlArray to a function template [message #49281 is a reply to message #49276]

Mon, 15 January 2018 14:13

omari
Messages: 276
Registered: March 2010

Experienced Member

Hi,

a Ctrl can't passed by value, use reference instead:

	void ExportCSV(T& o)

PS: think about using GetDesktopFolder ()

template <class T>
	void ExportCSV(T& o)
	{
		String filename = "";
		FileSel fs;
	
		fs.Type("CSV", "*.csv");
		fs.PreSelect(GetDesktopFolder ());
		if(!fs.ExecuteSaveAs()) return;
		filename = fs;
		SaveFile(filename, "Prova");
		FileOut out(filename);
		if(!out) {
			Exclamation(t_("Failed opening ") + filename);
			return;
		}
		
		out.Put(o.AsCsv());
	}

regards
omari.

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Re: Passing an ArrayCtrl / SqlArray to a function template [message #49283 is a reply to message #49281]

Mon, 15 January 2018 16:48

Giorgio
Messages: 218
Registered: August 2015

Experienced Member

Hi Omari,
thank you for your prompt answer.

Do you know if it is possible to use a function of a namespace with THISBACK?

My utilities library is defined as a namespace named util.
When I use the following syntax:

buttonExport.WhenPush = THISBACK1(util::ExportCSV, Jobs);

I got from the compiler Error C3083, Error C2039, Error C2065.

So I had to define a method:

void JobList::Do_export()
{
	util::ExportCSV(Jobs);
}

And then assign that method to the button:

buttonExport.WhenPush = THISBACK(Do_export);

Regards,
Giorgio

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Re: Passing an ArrayCtrl / SqlArray to a function template [message #49284 is a reply to message #49283]

Mon, 15 January 2018 17:39

omari
Messages: 276
Registered: March 2010

Experienced Member

for your case, I think the best is to use lambda expression :

buttonExport << [&] {util::ExportCSV(Jobs);};

to answer your question, THISBACK only accepts memeber functions.
for a global function, uses callback:

buttonExport.WhenPush = callback1(util::ExportCSV, Jobs);

regards
omari.

[Updated on: Mon, 15 January 2018 17:39]

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Re: Passing an ArrayCtrl / SqlArray to a function template [message #49289 is a reply to message #49284]

Tue, 16 January 2018 09:46

Giorgio
Messages: 218
Registered: August 2015

Experienced Member

Many thanks!

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