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HELPER: Value grouping to ValueArray [message #29800]

Thu, 18 November 2010 10:10

kohait00
Messages: 939
Registered: July 2009
Location: Germany

Experienced Contributor

hi all,

here comes a ArrayCtrl like grouper of Values to a ValueArray, returned as Value itself.
maybe its of help for someone..
since a variable arguments list is suboptimal in c++, this is definitely a better solution in general. good work who ever did this for ArrayCtrl..

syntax:

Value ToValueArray(const Value& [, const Value& ]...);

inline Value ToValueArray(const Vector<Value>& v)
{
	return ValueArray(Vector<Value>(v, 0));
}

inline Value ToValueArray(Vector<Value>& v)
{
	return ValueArray(v);
}

//$-Value ToValueArray(const Value& [, const Value& ]...);
#define  E__ToValueArray(I)      Value ToValueArray(__List##I(E__Value));
	__Expand(E__ToValueArray)
#undef   E__ToValueArray

#define E__Addv(I)    v << p##I
#define E__ToValueArrayF(I) \
Value ToValueArray(__List##I(E__Value)) { \
	Vector<Value> v; \
	__List##I(E__Addv); \
	return ValueArray(v); \
}
__Expand(E__ToValueArrayF)

CONSOLE_APP_MAIN
{
	Value v = ToValueArray(123, "Hallo", 23.0);
	RLOG(v);
}

Attachment: ValueGroup.rar
(Size: 0.57KB, Downloaded 156 times)

[Updated on: Thu, 18 November 2010 10:12]

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Re: HELPER: Value grouping to ValueArray [message #29825 is a reply to message #29800]

Sat, 20 November 2010 18:28

mirek
Messages: 13975
Registered: November 2005

Ultimate Member

kohait00 wrote on Thu, 18 November 2010 04:10

hi all,

here comes a ArrayCtrl like grouper of Values to a ValueArray, returned as Value itself.

What about doing this as constructor overloads? Perhaps starting with 2 parameters to avoid copy variant. Or is it too ambiguous?

Quote:

since a variable arguments list is suboptimal in c++, this is definitely a better solution in general.

That is why Format uses the same technique...

Quote:

good work who ever did this for ArrayCtrl..

Thanks

Mirek

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Re: HELPER: Value grouping to ValueArray [message #29826 is a reply to message #29825]

Sat, 20 November 2010 19:48

kohait00
Messages: 939
Registered: July 2009
Location: Germany

Experienced Contributor

What about doing this as constructor overloads? Perhaps starting with 2 parameters to avoid copy variant. Or is it too ambiguous?

as far as got to know the ValueArray code, it does adding values by adding it to internal Vector<Value> anyway.
doing it like in the example above already provides the prepared Vector<Value> to pick, so no copy is done. and it saves the ValueArray interface from growing Smile

and remains optional usage.

ambiguity maybe could be a side effect some day in other occassions.. i consider ValueArray(_pick Vector<Value>&) flexible enough if you ask me..

it'd also be possible to leave it like it is now and simply do

Value v = ValueArray(Vector<Value>() << 123 << "Hallo" << 34.9);

its not so nice, but neither generates extra code in Upp base to manage Smile

it was just an idea, to increase readability

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Re: HELPER: Value grouping to ValueArray [message #29996 is a reply to message #29826]

Thu, 02 December 2010 13:44

kohait00
Messages: 939
Registered: July 2009
Location: Germany

Experienced Contributor

i came to the conclusion that easy is best again Smile

#define ASVALUEARRAY(x) ValueArray(Vector<Value>() << x)

Value v = ASVALUEARRAY(123 << "Hallo" << 34.9);

is actually same approach as in concatenating to cout, or in LOG()
so is almost natural Smile

maybe this can go to Value.h..

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