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POhow to pass an object by reference to be used by another file
 

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  1. POhow to pass an object by reference to be used by another file
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    <p>I want to access this function in a file known as MinPriority.cpp: </p> <pre><code>MinPriority::priority&amp; MinPriority::HEAP_EXTRACT_MIN(*this) //dequeue's min element of tree { MinPriority::priority&amp; min = heapArray.front(); heapArray.erase(heapArray.begin()); MIN_HEAPIFY(0); return min; } </code></pre> <p>It is supposed to dequeue an element from the vector <code>heapArray</code> and pass the object <code>priority</code> into another file known as Graph.cpp. Here is where the function is called in Graph.cpp...</p> <pre><code>void Graph::MST_PRIM() { MinPriority priority; for(unsigned int i = 0; i != adjList.size(); i++) { priority.createArray(adjList[i].front().m_vertex, *this); } while(priority.queue_Empty() == false) { priority&amp; u = priority.HEAP_EXTRACT_MIN(/*...*/); //graph.cpp 88 } } </code></pre> <p>class MinPriority is declared as: (sketched it up for simplicity)</p> <pre><code>class MinPriority { private: class priority { public: priority(string preVertex, string vertex, int weight) { m_preVertex = preVertex; m_vertex = vertex; m_weight = weight; } ~priority(){} string m_preVertex; string m_vertex; int m_weight; }; vector&lt;priority&gt; heapArray; public: //member functions are included here... }; </code></pre> <p>basically, in the end, I want to be able to pop stuff out of heapArray, pass it to functions in Graph.cpp and possibly modify things already in the heapArray from Graph.cpp. I never need push things onto the data structure as they are already there (because of a function not shown). Error:</p> <pre><code>$ make -f makefile.txt g++ -Wall -W -pedantic -g -c Graph.cpp Graph.cpp: In member function `void Graph::MST_PRIM()': Graph.cpp:88: error: `u' undeclared (first use this function) Graph.cpp:88: error: (Each undeclared identifier is reported only once for each function it appears in.) Graph.cpp:88: error: no matching function for call to `MinPriority::HEAP_EXTRACT_MIN()' MinPriority.h:39: note: candidates are: MinPriority::priority&amp; MinPriority::HEAP_EXTRACT_MIN(MinPriority::priority&amp;) Graph.cpp: At global scope: Graph.cpp:97: warning: unused parameter 'vertex' makefile.txt:9: recipe for target `Graph.o' failed make: *** [Graph.o] Error 1 </code></pre>
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    1. COWhy do you have `*this` in the `HEAP_EXTRACT_MIN` parameter list? That won't compile.
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      1. POhow to pass an object by reference to be used by another file
      1. USJoseph Mansfield
    2. COIt worked in another function that I got helped on in this post: http://stackoverflow.com/questions/20723876/how-do-i-pass-an-object-by-reference-inside-parameters
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      1. POhow to pass an object by reference to be used by another file
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    3. COThat's passing *to* a function, not in the function declaration. What exactly is the problem you're having? What's your error?
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      1. USJoseph Mansfield
 

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