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Blitz Support : |
From: Breeveld, Eddie \(Reigate\) (Eddie.Breeveld_at_[hidden])
Date: 2005-04-04 03:29:22
Thanks Patrick, but unfortunately I get the same error (Microsoft VS.NET
7.1)
Pass by value gives the error:
Example_1.cpp(744) : error C2784: 'T RTSumAll(const
blitz::Array<T,N_rank>)' : could not deduce template argument for 'const
blitz::Array<P_numtype,N_rank>' from
'blitz::BzBinaryExprResult<OP,O1,O2>::T_result'
with
[
OP=blitz::Multiply,
O1=blitz::Array<double,1>,
O2=double
]
RTArraySum.h(17) : see declaration of 'RTSumAll'
Pass by reference gives the error:
Example_1.cpp(744) : error C2784: 'T RTSumAll(const
blitz::Array<T,N_rank> &)' : could not deduce template argument for
'const blitz::Array<P_numtype,N_rank> &' from
'blitz::BzBinaryExprResult<OP,O1,O2>::T_result'
with
[
OP=blitz::Multiply,
O1=blitz::Array<double,1>,
O2=double
]
RTArraySum.h(17) : see declaration of 'RTSumAll'
The simplified test function I'm calling (this is the 'by value'
version):
template<typename T, int N> inline
T RTSumAll(const Array<T,N> A)
{
return sum(A);
};
And the line calling it is:
rate = RTSumAll(fund * 6.0);
Any other suggestions?
All the best,
Eddie
____________________
Edward Breeveld
eSolutions
Watson Wyatt LLP
Watson House, London Road,
Reigate, Surrey, RH2 9PQ, UK
Tel. +44 (0)1737 274151
Fax. +44 (0)1737 241496
www.watsonwyatt.com
-----Original Message-----
From: blitz-support-bounces_at_[hidden]
[mailto:blitz-support-bounces_at_[hidden]] On Behalf Of Patrick Guio
Sent: 01 April 2005 17:58
To: Support list for Blitz++
Subject: Re: [Blitz-support] Functions that take array expressions
On Fri, 1 Apr 2005, Breeveld, Eddie (Reigate) wrote:
> Dear Blitz++ Support,
>
> We use a lot of functions that take Blitz++ arrays, and these work
> fine provided we do not supply an array expression as an argument. For
> instance, if we have a function "Afun", and a Blitz++ array
> "arrayArg", our functions work well with
>
> result = Afun (arrayArg);
>
> Here "Afun" is defined as a templated function to take Blitz arrays of
> any rank and shape:
>
> template<typename T, int N> inline
> T Afun (const Array<T,N> &arrayArg)
> {
> // some function that returns (in this case) a scalar of type T
> ...
> };
>
> Unfortunately this does not work with expressions as arguments. How do
> I define a function that will work with both arrays directly (as
> above) and expressions such as
>
> result = Afun (arrayArg + 6);
> result = Afun (arrayArg1 * arrayArg2);
> result = Afun (arrayArg1 * Bfun(arrayArg2 * arrayArg3) + 11.56);
>
> I can set up temporary arrays to hold the intermediate results, but
> this is very awkward in our code, as some of it is automatically
> generated. I can also cast the result of the expression back into an
> array, but again this works but is awkward. I would much rather have
> one or more templated functions that can take arrays directly, as well
> as expressions involving arrays.
>
Hi Eddie,
I think you should pass the argument by value instead of by reference.
> template<typename T, int N> inline
> T Afun (const Array<T,N> arrayArg)
instead of
> template<typename T, int N> inline
> T Afun (const Array<T,N> &arrayArg)
Sincerely,
Patrick
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