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hmm vector headache

Started by veiled eagle Apr 25, 2006 at 7:42 AM 7 replies 1.1k views

Original Post

veiled eagle

Apr 25, 2006 at 7:42 AM

Hey heres a stupid question why won't this call work, it gives me a bunch of conversion errors

Quote:
std::vector * boidIndex; Boid * pBoid = boidIndex[boidId];

Quote:
error C2440: 'return' : cannot convert from 'std::vector<_Ty>' to 'Flock *const ' with [ _Ty=Flock * ]

its most likely something simple, but my brain and patience are getting a bit worn...

dave

Apr 25, 2006 at 7:45 AM

Is it definately that lin causing any problems because i dont see any Flock there.

Dave

Graham11

Apr 25, 2006 at 7:47 AM

AT the least, you'll need a cast. Recommended std::vector usage would use iterators etc. A right pain, but presumable 'safer' than pointers...

CTar

Apr 25, 2006 at 7:50 AM

boidIndex is a pointer to a std::vector, are you sure you don't mean to do like this?

std::vector<Boid*> boidIndex;

If you know what you are doing and want to keep it a pointer for some reason, then you need to dereference the pointer before using, like this:

Boid * pBoid = (*boidIndex)[boidId];

veiled eagle

Apr 25, 2006 at 7:50 AM

im having errors with a few object types its all the same errors just different types

Quote:

std::vector * flockIndex;

Flock* pFlock = flockIndex[flockId];

Quote:

error C2440: 'initializing' : cannot convert from 'std::vector<_Ty>' to 'Flock *'
with
[
_Ty=Flock *
]

Evil Steve

Apr 25, 2006 at 7:52 AM

Quote:
Original post by veiled eagle
im having errors with a few object types its all the same errors just different types

Quote:

std::vector * flockIndex;

Flock* pFlock = flockIndex[flockId];

Quote:

error C2440: 'initializing' : cannot convert from 'std::vector<_Ty>' to 'Flock *'
with
[
_Ty=Flock *
]

Quote:
Original post by CTar
boidIndex is a pointer to a std::vector, are you sure you don't mean to do like this?
std::vector<Boid*> boidIndex;

If you know what you are doing and want to keep it a pointer for some reason, then you need to dereference the pointer before using, like this:
Boid * pBoid = (*boidIndex)[boidId];