U++ framework: U++ Core » FIX: Value has Value, Value Type VALUE

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FIX: Value has Value, Value Type VALUE_V [message #30124]

Fri, 10 December 2010 08:51

kohait00
Messages: 939
Registered: July 2009
Location: Germany

Experienced Contributor

hi,

this works fine

Value v = RichValue<Value>(Value(123));

and generates a Value that has a Value in it..creating a nice chicken egg problem Smile

but it does not use VALUE_V as its Type.

please, add
Value.h:275

template<> inline dword ValueTypeNo(const Value*)   { return VALUE_V; }

to have this conceptually right..

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Re: FIX: Value has Value, Value Type VALUE_V [message #30142 is a reply to message #30124]

Sat, 11 December 2010 13:15

mirek
Messages: 14291
Registered: November 2005

Ultimate Member

VALUE_V is only defined because of Ref.

Mirek

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Re: FIX: Value has Value, Value Type VALUE_V [message #30143 is a reply to message #30142]

Sat, 11 December 2010 18:14

kohait00
Messages: 939
Registered: July 2009
Location: Germany

Experienced Contributor

Well�, but it would only be consistant to define a known value for that case and not have it use a 'generated' value. Or would it harm any other project? Cause valuearray and valuemap have their own id's as well.

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Re: FIX: Value has Value, Value Type VALUE_V [message #30146 is a reply to message #30143]

Sat, 11 December 2010 18:49

mirek
Messages: 14291
Registered: November 2005

Ultimate Member

ValueTypeNo is only used with Value. Value should never contain VALUE_V.

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Re: FIX: Value has Value, Value Type VALUE_V [message #30156 is a reply to message #30146]

Sun, 12 December 2010 12:01

kohait00
Messages: 939
Registered: July 2009
Location: Germany

Experienced Contributor

ok, thats a word..

btw: is there any documentation on 'what is a Ref and how to use it?' i cant quite imagine what it's about

[Updated on: Sun, 12 December 2010 12:02]

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Re: FIX: Value has Value, Value Type VALUE_V [message #30160 is a reply to message #30156]

Sun, 12 December 2010 15:54

mirek
Messages: 14291
Registered: November 2005

Ultimate Member

Sorry, no.

Ref is AFAIK only used with Sql::Fetch. But it is a quite strong case to support its existence...

Consider:

Date date;
String name;
double price;
sql * Select(NAME, SINCE, PRICE).From(TABLE);
while(sql.Fetch(name, date, price)) {
   .....
}

Mirek

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