On Dec 20, 2007 9:45 PM, Andry <
andry@inbox.ru> wrote:
Hello Robert,
Friday, December 21, 2007, 1:46:24 AM, you wrote:
RD> If I have to do it manually it pretty much defeats the
RD> purpose of using it in the first place. I want it to be automated.
You can download here
https://sourceforge.net/project/showfiles.php?group_id=198908&package_id=243070&release_id=552700
patch to boost 1.34.1 which adding to preprocessor some additional
functionality in which is BOOST_PP_ASSIGN_SLOT_BUILTIN_COUNTER.
Purpose of this macro is assigning to slots builtin counters like
__COUNTER__, here the example:
//////////////////////////////////////////////////////////////////////////
#include <stdio.h>
#include <boost/preprocessor/slot/slot.hpp>
#include <boost/preprocessor/arithmetic/sub.hpp>
#define BUILTIN_COUNTER __COUNTER__
int builtin_counter_already_utilized_somewhere[] = {
BUILTIN_COUNTER,BUILTIN_COUNTER,BUILTIN_COUNTER,BUILTIN_COUNTER,
BUILTIN_COUNTER,BUILTIN_COUNTER,BUILTIN_COUNTER,BUILTIN_COUNTER,
BUILTIN_COUNTER,BUILTIN_COUNTER
};
//Remember and increment last build-in counter value.
//WARNING: Slot #1 can be used by another (external) code (for example, by another included header),
// you should exactly know that slot #1 doesn't used some else where between includes.
#define BOOST_PP_VALUE BUILTIN_COUNTER
#include BOOST_PP_ASSIGN_SLOT_BUILTIN_COUNTER(1) //Evaluate BOOST_PP_VALUE as built-in counter and push it in slot #1
#define MYCOUNTER BOOST_PP_SUB(BUILTIN_COUNTER,BOOST_PP_SLOT(1))
int main() {
int myarray[] = {MYCOUNTER,MYCOUNTER,MYCOUNTER,MYCOUNTER};
printf("builtin_counter_already_utilized_somewhere:\n");
for(int i = 0; i < sizeof(builtin_counter_already_utilized_somewhere)/sizeof(builtin_counter_already_utilized_somewhere[0]); i++) {
printf("%d\n",builtin_counter_already_utilized_somewhere[i]);
}
printf("myarray:\n");
for(int i = 0; i < sizeof(myarray)/sizeof(myarray[0]); i++) {
printf("%d\n",myarray[i]);
}
printf("__COUNTER__ = %u\n",BUILTIN_COUNTER);
return 0;
}
//////////////////////////////////////////////////////////////////////////
You should use BOOST_PP_ASSIGN_SLOT_BUILTIN_COUNTER instead BOOST_PP_ASSIGN_SLOT
when defining BOOST_PP_VALUE to built-in counter macro.
In your code you should do something what:
//////////////////////////////////////////////////////////////////////////
#define BOOST_PP_VALUE __COUNTER__
#include BOOST_PP_ASSIGN_SLOT_BUILTIN_COUNTER(1)
#define CHECK_MATCH_AND_RETURN( action ) if( str == #action ) {
return action; } void(__COUNTER__);
CHECK_MATCH_AND_RETURN( ROTATE_LEFT )
CHECK_MATCH_AND_RETURN( ROTATE_RIGHT )
CHECK_MATCH_AND_RETURN( ROTATE_UP )
CHECK_MATCH_AND_RETURN( ROTATE_DOWN )
CHECK_MATCH_AND_RETURN( MOVE_UP )
CHECK_MATCH_AND_RETURN( MOVE_DOWN )
CHECK_MATCH_AND_RETURN( MOVE_LEFT )
CHECK_MATCH_AND_RETURN( MOVE_RIGHT )
CHECK_MATCH_AND_RETURN( MOVE_FORWARD )
CHECK_MATCH_AND_RETURN( MOVE_BACKWARD )
CHECK_MATCH_AND_RETURN( ROLL_RIGHT )
CHECK_MATCH_AND_RETURN( ROLL_LEFT )
CHECK_MATCH_AND_RETURN( INCREASE_ACCEL )
CHECK_MATCH_AND_RETURN( DECREASE_ACCEL )
CHECK_MATCH_AND_RETURN( ENABLE_LOOK )
CHECK_MATCH_AND_RETURN( TOGGLE_LOOK )
CHECK_MATCH_AND_RETURN( ENABLE_AUTO_MOVE )
CHECK_MATCH_AND_RETURN( TOGGLE_AUTO_MOVE )
// This helps me remember to add/remove items above.
BOOST_STATIC_ASSERT( BOOST_PP_SUB(__COUNTER__,BOOST_PP_SLOT(1))+1 != NUM_CAMERAACTIONS );
//////////////////////////////////////////////////////////////////////////
PS: GNU C/C++ recently supports __COUNTER__ macro from 4.3 version.
--