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Let's try again,

Hi there,

I am looking for a trick to avoid maintaining the 'Create' function
as describe below. All it does is a simple template instantiation, are
there any trick which would avoid having to maintain this 'Create' as
the number of enum grows ?

Thanks

#include <string.h>

typedef enum {
TYPE1,
TYPE2
} TYPES;

class type1 {};
class type2 {};

template <int T> struct Factory;
template <> struct Factory<TYPE1> { typedef type1 Type; };
template <> struct Factory<TYPE2> { typedef type2 Type; };

template <int N>
typename Factory<N>::Type* Create()
{
return new typename Factory<N>::Type;
}

int main()
{
const char *file[] = {
"TYPE2",
"TYPE1",
};
const unsigned int n = sizeof(file) / sizeof(*file);
for(unsigned int i = 0; i < n; ++i)
{
if( strcmp(file[i], "TYPE1" ) == 0 )
{
type1 *t = Create<TYPE1>();
}
else if( strcmp(file[i], "TYPE2" ) == 0 )
{
type2 *t = Create<TYPE2>();
}
}
return 0;
}

On Aug 6, 11:55*am, mathieu <mathieu.malate...@gmail.com> wrote:
> Let's try again,
>
> Hi there,
>
> * I am looking for a trick to avoid maintaining the 'Create' function
> as describe below. All it does is a simple template instantiation, are
> there any trick which would avoid having to maintain this 'Create' as
> the number of enum grows ?
>
> Thanks
>
> #include <string.h>
>
> typedef enum {
> * TYPE1,
> * TYPE2
>
> } TYPES;
>
> class type1 {};
> class type2 {};
>
> template <int T> struct Factory;
> template <> struct Factory<TYPE1> { typedef type1 Type; };
> template <> struct Factory<TYPE2> { typedef type2 Type; };
>
> template <int N>
> typename Factory<N>::Type* Create()
> {
> * *return new typename Factory<N>::Type;
>
> }
>
> int main()
> {
> * const char *file[] = {
> * * "TYPE2",
> * * "TYPE1",
> * };
> * const unsigned int n = sizeof(file) / sizeof(*file);
> * for(unsigned int i = 0; i < n; ++i)
> * * {
> * * if( strcmp(file[i], "TYPE1" ) == 0 )
> * * * {
> * * * type1 *t = Create<TYPE1>();
> * * * }
> * * else if( strcmp(file[i], "TYPE2" ) == 0 )
> * * * {
> * * * type2 *t = Create<TYPE2>();
> * * * }
> * * }
> * return 0;
>
> }
>
>

I just found out: BOOST_PP_LIST_FOR_EACH which looks pretty cool.

http://www.boost.org/doc/libs/1_39_0...ch_builtin.cpp

Thx