AMDG
Kai Liu wrote:
I am trying to use the preprocessor library to simplify the code I have.
The problem:
I have many lines of the following assignments:
mybfclass x_0_mybf;
mybfclass x_1_mybf;
...
mybfclass1 x_0_mybf1;
mybfclass1 x_1_mybf1;
...
mybfclass2 x_0_mybf2;
mybfclass2 x_1_mybf2;
then I defined several vectors:
vector<mybfclass*> x_mybf;
vector<mybfclass1*> x_mybf1;
vector<mybfclass2*> x_mybf2;
*
use the boost preprocessor library, I write the following code:
#define* DECLX_mybf(z, n, text) BOOST_PP_CAT(text, BOOST_PP_CAT(_,
mybf)).push_back(&BOOST_PP_CAT(text, BOOST_PP_CAT(BOOST_PP_CAT(_, n),
BOOST_PP_CAT(_, mybf))));
*#define* DECLX_mybf1(z, n, text) BOOST_PP_CAT(text, BOOST_PP_CAT(_,
mybf)).push_back(&BOOST_PP_CAT(text, BOOST_PP_CAT(BOOST_PP_CAT(_, n),
BOOST_PP_CAT(_, mybf))));
*#define* DECLX_mybf2(z, n, text) BOOST_PP_CAT(text, BOOST_PP_CAT(_,
mybf)).push_back(&BOOST_PP_CAT(text, BOOST_PP_CAT(BOOST_PP_CAT(_, n),
BOOST_PP_CAT(_, mybf))));
BOOST_PP_REPEAT_FROM_TO(0, 2, DECLX_mybf, x);
*// generated: x_mybf.push_back(&x_0_mybf); x_mybf.push_back(&x_1_mybf);
* BOOST_PP_REPEAT_FROM_TO(0, 2, DECLX_mybf1, x);
*// generated: x_mybf1.push_back(&x_0_mybf1); x_mybf1.push_back(&x_1_mybf);
* BOOST_PP_REPEAT_FROM_TO(0, 2, DECLX_mybf2, x);
*// generated: x_mybf2.push_back(&x_0_mybf2); x_mybf2.push_back(&x_1_mybf);
*
but I think it is too much coding here, since I have to write a macro for
each mybf occurrence, DECLX_mybf
I have difficulty to use the BOOST_PP_REPEAT_FROM_TO for two argument, since
the macro(z, x, data) can only accept one argument data, however, I need to
pass two arguments x and mybf to the macro,
in order to generate a mybfclass1 x_0_mybf.
does anyone know how to apply macro to generate the above structure?
#define DECLX(z, n, data) \
BOOST_PP_CAT(\
BOOST_PP_TUPLE_ELEM(2, 1, data),\
BOOST_PP_CAT(\
_,\
BOOST_PP_TUPLE_ELEM(2, 0, data))\
).push_back(\
&BOOST_PP_CAT(\
BOOST_PP_TUPLE_ELEM(2, 1, data),\
BOOST_PP_CAT(\
BOOST_PP_CAT(_, n),\
BOOST_PP_CAT(\
_,\
BOOST_PP_TUPLE_ELEM(2, 0, data)))));
BOOST_PP_REPEAT_FROM_TO(0, 2, DECLX, (mybf, x));
In Christ,
Steven Watanabe