Question

Here is a bit of code that I’m currently using:

int Engine::getEntityCount(const int objectType)
{
    using namespace std;

    int total = 0;
    for_each(p_entities.begin(), p_entities.end(),
    [&objectType,&total](pair<const int, const list<Entity*>> pair)
    {   
        for_each((pair.second).begin(),(pair.second).end(),
        [&objectType,&total](Entity* &entity)
        {
            if ( entity->getAlive() == true && entity->getObjectType() == objectType )
                ++total;
        });
    });
    return total;
}

I’m getting the following error from intel c++:

error : function “lambda [](Entity *&)->void::operator()”
cannot be called with the given argument list c:\Program Files
(x86)\Microsoft Visual Studio 10.0\VC\include\algorithm

I’m having difficulty understanding what’s wrong here. Does anyone have any ideas?

Answer 1

You’re asking for a non-const reference to a pointer to an Entity. The list containing that pointer is const. You must decide between a non-const pointer or a const list.