iterate through this
Author
I just started using iterators and this one has got me good ;P
std::map<std::string, std::vector<Agent*> >
I would like to loop through like this
/////////////////
for each string
for each Agent in vector associated with current string
/////////////////
i would post what i have so far but I think it just so wrong it would confuse people ...
You probably want some thing like (been a while since I've used STL, so this may not be exactly how it is supposed to be):
std::map<std::string, std::vector<Agent*> > map;for (std::map<std::string, std::vector<Agent*> >::iterator iterator = map.begin(); iterator != map.end(); ++iterator) { for (std::vector<Agent*>::iterator agentIterator = (*iterator).begin(); agentIterator != (*iterator).end(); ++agentIterator) { // ... }}
My STL isn't brilliant but...Of course you should use const_iterators if you're not going to modify anything.
typedef std::vector<Agent*> agentvector;typedef std::map<std::string, agentvector> mymap;mymap agentmap;for (mymap::iterator it = agentmap.begin(); it != agentmap.end(); ++it){ agentvector &agents = it->second; for (agentvector::iterator vit = agents.begin(); vit != agents.end(); ++vit) { Agent *a = *vit; // Now do whatever with a }}
Do you really want to iterate through ALL existing strings? Or just those that are keys in your map? If so try this:
typedef std::map > tAgentMap;
tAgentMap mapMap
for( tAgentMap::iterator i = mapMap.begin();
i != mapMap.end()
++i )
{
// blablabla
}
typedef std::map > tAgentMap;
tAgentMap mapMap
for( tAgentMap::iterator i = mapMap.begin();
i != mapMap.end()
++i )
{
// blablabla
}
Example:
Explanation:
Do note that I have a dummy Agent class.
jfl.
[edit] Oh well, so much for being quick.
#include <vector>#include <map>#include <string>class Agent {};typedef std::vector< Agent * > AgentVector;typedef std::map< std::string, AgentVector > AgentMap;typedef AgentVector::iterator AgentVectorIterator;typedef AgentMap::iterator AgentMapIterator;int main() { AgentMap agents; AgentVector one( 10, ( Agent * )0 ); AgentVector two( 3, ( Agent * )1 ); agents["one"] = one; agents["two"] = two; for( AgentMapIterator mi = agents.begin(); mi != agents.end(); ++mi ) { for( AgentVectorIterator vi = mi->second.begin(); vi != mi->second.end(); ++ vi ) { // Do Stuff } }}Explanation:
Do note that I have a dummy Agent class.
typedef std::vector< Agent * > AgentVector;typedef std::map< std::string, AgentVector > AgentMap;typedef AgentVector::iterator AgentVectorIterator;typedef AgentMap::iterator AgentMapIterator;typedef std::pair< std::string, AgentVector > MapPair;for( AgentMapIterator mi = agents.begin(); mi != agents.end(); ++mi )for( AgentVectorIterator vi = mi->second.begin(); vi != mi->second.end(); ++ vi )jfl.
[edit] Oh well, so much for being quick.
Author
... thanks guys...
i got it to work and in the end it look something like this
i got it to work and in the end it look something like this
std::map<std::string, std::vector<Agent*> >::iterator iterator;std::vector<Agent*>::iterator agentIterator; // FIND TYPE <--- will be several case specificiterator = rAgentMap.find(m_pStats->m_agentType);if(iterator != rAgentMap.end()){ for (agentIterator = iterator->second.begin(); agentIterator != iterator->second.end(); ++agentIterator) { // stuff }}else{// other stuff}
Author
dang... i spoke a little to soon...
from the above this would be in the inner most loop..
//
//testDist = D3DXVec3Length(&m_state.GetPos() - agentIterator->m_state.GetPos());
//
that causes an error.. how to i convert the iterator to an Agent... my intellisense is broken ;(
from the above this would be in the inner most loop..
//
//testDist = D3DXVec3Length(&m_state.GetPos() - agentIterator->m_state.GetPos());
//
that causes an error.. how to i convert the iterator to an Agent... my intellisense is broken ;(
You would probably do *agentIterator->m_state.GetPos().
The reason for this is that when calling operator-> on an iterator, you dereference the iterator, but what you get is an Agent *, so you need to dereference twice.
jfl.
The reason for this is that when calling operator-> on an iterator, you dereference the iterator, but what you get is an Agent *, so you need to dereference twice.
jfl.
Quote:Original post by Anonymous Poster
... we need 'auto' so bad ....
C++ already has a auto keyword, which seems pretty useless. I assume you mean type inference?
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