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PODefining maps in class
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copied!<p>I am new to C++ and am not able to correctly define maps in class definition.</p> <p>Here is the code I have written:</p> <pre><code>#include<stdio.h> #include <iostream> #include <map> #include <utility> // make_pair #include <string.h> #include <sstream> using namespace std; class assgnt { private: //typedef std::map<int, int> MapType; //MapType my_map; public: bool isGoodPoint(int x, int y); void addGoodNeighbours(int x, int y); }; inline bool assgnt::isGoodPoint(int x, int y) { string xs, ys; stringstream xout, yout; int xsum=0, ysum=0; xout<<x; yout<<y; xs = xout.str(); ys = yout.str(); for each (char c in xs) { xsum = xsum + int(c); } for each (char c in ys) { ysum = ysum + int(c); } if (xsum+ysum <= 19) return true; else return false; } inline void assgnt::addGoodNeighbours(int x, int y) { //if assgnt::isGoodPoint(x+1,y) if(isGoodPoint(x+1,y)) { } /*if isGoodPoint(x+1,y) and [x+1,y] not in points: points.append([x+1,y]) if isGoodPoint(x-1,y) and [x-1,y] not in points: points.append([x-1,y]) if isGoodPoint(x,y+1) and [x,y+1] not in points: points.append([x,y+1]) if isGoodPoint(x,y-1) and [x,y-1] not in points: points.append([x,y-1])*/ } int main() { typedef std::map<int, int> MapType; MapType my_map; // insert elements using insert function my_map.insert(std::pair<int, int>(0, 0)); int i=0; while true { //my_map.insert(std::pair<int, int>(2, 2)); //my_map.insert(std::pair<int, int>(3, 3)); //my_map.insert(MapType::value_type(4, 4)); // all standard containers provide this typedef //my_map.insert(std::make_pair(5, 5)); // can also use the utility function make_pair MapType::iterator iter = my_map.begin(); std::cout << "Size of my_map: " << my_map.size() << '\n'; std::cout << "Enter a key to search for: "; int c; std::cin >> c; iter = my_map.find(c); if (iter != my_map.end()) { int num = iter->second; if(num == 0) std::cout << "Value is found: " << iter->second << '\n'; else std::cout << "Value not found: "; } else std::cout << "Key is not in my_map" << '\n'; // my_map.clear(); } </code></pre> <p>I wish to define the map typedef std::map MapType; in the class definition, so that I can use it in all inline functions and the main() by creating its object.</p> <p>Please help.</p>

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