[ADOL-C] support for operator overloading for pdouble

[Brad Bell]

A pdouble in ADOLC is like a dynamic parmaeter in CppAD see new_dynamic on
https://coin-or.github.io/CppAD/doc/new_dynamic.htm

I  extended  CppAD to allow for operations that  only involve dynamic parameters; see the heading 
08-04 on
https://coin-or.github.io/CppAD/doc/whats_new_18.htm

This was done by creating a separate and much simpler tape for the dynamic parameter operations; see 
the variables
dyn_par_is_, dyn_par_op_, and dyn_par_op_ in the file
https://github.com/coin-or/CppAD/blob/master/cppad/local/recorder.hpp


On 02/28/2018 01:56 AM, hg wrote:
> Dear Adol-C developers
>
> I would like to report that the example taylor/inversexam.cpp failed with ADOL-C release v2.6.3, 
> but it worked with the developer version. Hope the new stable release will be released soon.
>
> Additionally I would like to request to add the operator overloading for pdouble type. Because 
> some material constants are formed from others and it would lead to a neatly code if an immediate 
> variable of type pdouble is created. Right now I have to copy a lengthy expression to a lengthy 
> one, leading to quite a complicated expression, which is then hard to debug if something happen 
> later on.
>
> Right now if I added the pdouble, the compilation error appears:
>
> const pdouble& __o_11_n = mkparam(input.o_11_n());
> const pdouble& __o_22_n = mkparam(input.o_22_n());
> const pdouble& __o_33_n = mkparam(input.o_33_n());
>
> pdouble __p_n = (__o_11_n + __o_22_n + __o_33_n)/3;
>
>
> error: ambiguous overload for ‘operator+’ (operand types are ‘const pdouble’ and ‘const pdouble’)
>          pdouble __p_n = (__o_11_n + __o_22_n + __o_33_n)/3;
>                                    ^
> In file included from /home/hbui/opt/adol-c/include/adolc/adouble.h:329:0,
>                  from /home/hbui/opt/adol-c/include/adolc/adolc.h:28,
>                  from 
> /home/hbui/kratos_bcn2/applications/soil_mechanics_application/constitutive_laws/smoothed_mohr_coulomb_ad_explicit_lode_angle.cpp:18:
> /home/hbui/opt/adol-c/include/adolc/param.h:105:13: note: candidate: adub operator+(const 
> pdouble&, const badouble&)
>  inline adub operator + ( const pdouble& a, const badouble& b)
>              ^
> In file included from /home/hbui/opt/adol-c/include/adolc/param.h:58:0,
>                  from /home/hbui/opt/adol-c/include/adolc/adouble.h:329,
>                  from /home/hbui/opt/adol-c/include/adolc/adolc.h:28,
>                  from 
> /home/hbui/kratos_bcn2/applications/soil_mechanics_application/constitutive_laws/smoothed_mohr_coulomb_ad_explicit_lode_angle.cpp:18:
> /home/hbui/opt/adol-c/include/adolc/internal/paramfunc.h:50:34: note: candidate: adub 
> operator+(const badouble&, const pdouble&)
>      friend ADOLC_DLL_EXPORT adub operator + ( const badouble&, const pdouble&);
>
>
> Best regards
> Giang Bui
>