Usage problem on std::unordered_map

There is an error saying that unordered_map has no associated operator '->'
Any ideas why?
Thanks
Jack

Code:

---


#ifndef _OGREDETOURCROWDBASE_H_
#define _OGREDETOURCROWDBASE_H_

class OgreDetourCrowdBase {
public:
    virtual Ogre::Real getAgentHeight(void) = 0; 
    virtual Ogre::Real getAgentRadius(void) = 0;
    virtual int getNbAgents(void) { return 0; }
    virtual int getMaxNbAgents(void) { return 0; }
};


#endif

std::unordered_map<std::string, OgreDetourCrowdBase*> mDetourCrowd;

OgreDetourCrowdBase *detourCrowd = new OgreDetourCrowd(mRecast);
OgreDetourCrowdBase *detourCrowdCB = new OgreDetourCrowdCB(mRecastCB);
OgreDetourCrowdBase *detourCrowdVNA = new OgreDetourCrowdVNA(mRecastVNA);
OgreDetourCrowdBase *detourCrowdLorry = new OgreDetourCrowdLorry(mRecastLorry);

mDetourCrowd["Worker"] = detourCrowd;
mDetourCrowd["CB"] = detourCrowdCB;
mDetourCrowd["VNA"] = detourCrowdVNA;
mDetourCrowd["Lorry"] = detourCrowdLorry;

ObjectBase *OgreRecastApplication::createOperators(Ogre::String name, Ogre::Vector3 position) {
        if(mDetourCrowd["Worker"]->getNbAgents() >= mDetourCrowd["Worker"]->getMaxNbAgents()) {
        Ogre::LogManager::getSingletonPtr()->logMessage("Error: Cannot create crowd agent for new Worker. Limit of "+Ogre::StringConverter::toString(mDetourCrowd->getMaxNbAgents())+" reached", Ogre::LML_CRITICAL);
        throw new Ogre::Exception(1, "Cannot create crowd agent for new Worker. Limit of "+Ogre::StringConverter::toString(mDetourCrowd->getMaxNbAgents())+" reached", "OgreRecastApplication::getOrCreateCharacter("+name+")");
    }

   
    ObjectBase *worker = new Worker(name, mSceneMgr, mDetourCrowd, mDebugDraw, position);
    mObjects.push_back(worker);
    return worker;

}

---

Error 1 error C2819: type 'std::tr1::unordered_map<_Kty,_Ty>' does not have an overloaded member 'operator ->' e:\jacky\documents\visual studio 2010\projects\ogrecrowd\ogrecrowd\samples\src\ogrerecastapplication.cpp 379 1 OgreRecast
Error 2 error C2039: 'getMaxNbAgents' : is not a member of 'std::tr1::unordered_map<_Kty,_Ty>' e:\jacky\documents\visual studio 2010\projects\ogrecrowd\ogrecrowd\samples\src\ogrerecastapplication.cpp 379 1 OgreRecast
Error 3 error C2819: type 'std::tr1::unordered_map<_Kty,_Ty>' does not have an overloaded member 'operator ->' e:\jacky\documents\visual studio 2010\projects\ogrecrowd\ogrecrowd\samples\src\ogrerecastapplication.cpp 380 1 OgreRecast
Error 4 error C2039: 'getMaxNbAgents' : is not a member of 'std::tr1::unordered_map<_Kty,_Ty>' e:\jacky\documents\visual studio 2010\projects\ogrecrowd\ogrecrowd\samples\src\ogrerecastapplication.cpp 380 1 OgreRecast
Error 5 error C2664: 'Worker::Worker(Ogre::String,Ogre::SceneManager *,OgreDetourCrowd *,bool,Ogre::Vector3)' : cannot convert parameter 3 from 'std::tr1::unordered_map<_Kty,_Ty>' to 'OgreDetourCrowd *' e:\jacky\documents\visual studio 2010\projects\ogrecrowd\ogrecrowd\samples\src\ogrerecastapplication.cpp 384 1 OgreRecast
....
[/code]

Reduce your program to the smallest and simplest program that you expect will compile but which demonstrates this error, then post the code.

EDIT:
Nevermind, I see it now: mDetourCrowd->getMaxNbAgents()

Basically, you have a typo. Note that it occurs twice.

Quote:

---

Originally Posted by lucky6969b

There is an error saying that unordered_map has no associated operator '->'

---

How about MSDN? Or Google?
Compiler Error C2819

main.cpp

Code:

---

#include "OgreDetourCrowdBase.h"
#include "OgreDetourCrowdCB.h"
#include <unordered_map>
#include <iostream>

using namespace std;

std::unordered_map<std::string, OgreDetourCrowdBase*> mDetourCrowd;

int main() {
        OgreDetourCrowdBase *detourCB = new OgreDetourCrowdCB();

        mDetourCrowd["CB"] = detourCB;

        cout << mDetourCrowd["CB"]->getNbAgents() << endl;

}

---

OgreDetourCrowdBase.h

Code:

---

#ifndef _OGREDETOURCROWDBASE_H_
#define _OGREDETOURCROWDBASE_H_

class OgreDetourCrowdBase {
public:       
    virtual float getAgentHeight(void) = 0;
       
    virtual float getAgentRadius(void) = 0;
       
        virtual int getNbAgents(void) { return 0; }
         
        virtual int getMaxNbAgents(void) { return 0; }

       
};


#endif

---

OgreDetourCrowdCB.h

Code:

---

#include "OgreDetourCrowdBase.h"

class OgreDetourCrowdCB : public OgreDetourCrowdBase {
        float getAgentHeight(void) { return 5.0f; }
       
        float getAgentRadius(void) { return 1.0f; }
       
        int getNbAgents(void) { return 10; }
         
        int getMaxNbAgents(void) { return 10; }
};

---

Error 1 error C2678: binary '==' : no operator found which takes a left-hand operand of type 'const std::string' (or there is no acceptable conversion) c:\program files (x86)\microsoft visual studio 10.0\vc\include\xfunctional 92 1 Test

Thank you laserlight
Jack

Quote:

---

Originally Posted by lucky6969b

...
Error 1 error C2678: binary '==' : no operator found which takes a left-hand operand of type 'const std::string' (or there is no acceptable conversion) c:\program files (x86)\microsoft visual studio 10.0\vc\include\xfunctional 92 1 Test

---

But is another error! Not a C2819 one!
https://www.google.com/search?source...a=1&gws_rd=ssl
http://msdn.microsoft.com/en-us/libr...v=vs.100).aspx

Thanks Victor, The bug still exists. The test program runs fine, but the program I am working on does not.
I tried to overload the -> operator to no avail.
Jack

Quote:

---

Originally Posted by lucky6969b

I tried to overload the -> operator to no avail.
Jack

---

Define "no avail".

Code:

---

std::unordered_map<std::string, OgreDetourCrowdBase*> mDetourCrowd;

---

Quote:

---

Error 1 error C2678: binary '==' : no operator found which takes a left-hand operand of type 'const std::string' (or there is no acceptable conversion) c:\program files (x86)\microsoft visual studio 10.0\vc\include\xfunctional 92 1 Test

---

Have you included <string> somewhere not shown in the code?

Yes, all fixed, because of typos..... Thanks Victor and laserlight

Quote:

---

Originally Posted by lucky6969b

I tried to overload the -> operator to no avail.

---

Why do you want to overload the -> operator? It seems to me that you just need to change mDetourCrowd->getMaxNbAgents() to mDetourCrowd["Worker"]->getMaxNbAgents().

Yes, I spot that error too, it is all fine now.

I didn't see that statement because it was too far down the right.
I got it now. It's typo as you said..
Thanks

Quote:

---

Originally Posted by lucky6969b

There is an error saying that unordered_map has no associated operator '->'
Any ideas why?

---

Get the book The C++ Standard Library, second edition, by Josuttis.

Then you can solve most C++ standard problems yourself like this one.