#include #include /* structure template example. simulates std::pair type container, but with more values. variable mFirst is a key value used for identification/ comparison second to forth are types/values associated with key (first) */ /* Templates - see: http://www.cplusplus.com/doc/oldtutorial/templates/ */ template /* Data structures - see: http://www.cplusplus.com/doc/tutorial/structures/ */ struct StructTemplate { public: //Constructor StructTemplate(A first, B second, C third, D forth): mFirst(first), mSecond(second), mThird(third), mForth(forth) {std::cout << "Constructing new StructTemplate\n";} // get / set methods A first() const { return mFirst; } B second() const { return mSecond; } C third() const { return mThird; } D forth() const { return mForth; } void first(A val) { mFirst = val; } void second(B val) { mSecond = val; } void third(C val) { mThird = val; } void fourth(D val) { mForth = val; } /* Overloading comparison operator == to compare first value with right hand side of == - see: https://www.ibm.com/support/knowledgecenter/en/SSLTBW_2.2.0/com.ibm.zos.v2r2.cbclx01/cplr318.htm */ bool operator==(const A& rhs) { return first() == rhs; } /* define print function (code reuse) */ void print() { std::cout << first() << " " << second() << " " << third() << " " << forth() << "\n"; } private: /* data - uses template identifiers as datatypes. this allows us to specify the data types used by the template when creating a new structure */ A mFirst; B mSecond; C mThird; D mForth; }; int main() { /*creating single instance of StructTemplate */ StructTemplate one(1, 2, 3, 4); one.print(); /* creating another single instance */ StructTemplate two(2, "hi", 4, 5); two.print(); /* demonstrate comparing object keys */ if(one.first() == two.first()) { std::cout << "Object one and two have the same key\n"; } else { std::cout << "Object one and two do not have the same key\n"; } /* checking single object key (since we overloaded == we don't need to specify first()) */ if(two == 2) std::cout << "Key two is 2\n"; std::cout << "Creating a vector of StructTemplate's\n"; /* demonstrate using StructTemplate in array/vector */ std::vector> collection; collection.push_back(StructTemplate('a',"Test1",1,2.2)); collection.push_back(StructTemplate('b',"Test2",2,3.6)); for( auto& data: collection ) { data.print(); if(data == 'b') { std::cout << "Found key value " << data.first() << std::endl; } } return 0; }

StructureExample