Tell compiler ValueType is a generic type. public: void push_back(const ValueType& elem); // rest of implementation }
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4 template <typename ValueType> class StrVector { Tell compiler ValueType is a generic type. public: void push_back(const ValueType& elem); // rest of implementation }
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6 template <typename ValueType> class Vector { public: void push_back(const ValueType& elem); // rest of implementation } void Vector::push_back(const ValueType& val) { }
7 template <typename ValueType> class Vector { public: void push_back(const ValueType& elem); // rest of implementation } Compiler error void Vector::push_back(const ValueType& val) { }
8 template <typename ValueType> class Vector { public: void push_back(const ValueType& elem); // rest of implementation } void Vector::push_back(const ValueType& val) { }
9 template <typename ValueType> class Vector { public: void push_back(const ValueType& elem); // rest of implementation } void Vector::push_back(const ValueType& val) { }
10 template <typename ValueType> class Vector { public: void push_back(const ValueType& elem); // rest of implementation } void Vector<ValueType>::push_back(const ValueType& val) { }
11 template <typename ValueType> class Vector { public: void push_back(const ValueType& elem); // rest of implementation } Compiler error void Vector<ValueType>::push_back(const ValueType& val) { }
12 template <typename ValueType> class Vector { public: void push_back(const ValueType& elem); // rest of implementation } void Vector<ValueType>::push_back(const ValueType& val) { }
13 template <typename ValueType> class Vector { public: void push_back(const ValueType& elem); // rest of implementation } template <typename ValueType> void Vector<ValueType>::push_back(const ValueType& val) {
14 template <typename ValueType> class Vector { public: void push_back(const ValueType& elem); // rest of implementation } All good! template <typename ValueType> void Vector<ValueType>::push_back(const ValueType& val) {
15 typename template <typename ValueType> Vector<ValueType>::iterator Vector<ValueType>::push_back(const ValueType& val) { }
16 typename template <typename ValueType> Vector<ValueType>::iterator Vector<ValueType>::push_back(const ValueType& val) { }
17 typename template <typename ValueType> Vector<ValueType>::iterator Vector<ValueType>::push_back(const ValueType& val) { }
18 typename template <typename ValueType> typename Vector<ValueType>::iterator Vector<ValueType>::push_back(const ValueType& val) { }
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21 size_t string::size() const { // implementation } void string::clear() { // implementation }
22 string Internal State const interface non-const interface void foo(const string& input); void bar(string& input);
23 // constant pointer to a non-constant int int* const p; // non-constant pointer to a constant int const int* p; int const* p; // constant pointer to a constant int const int* const p; int const * const p;
24 // acts like int* const it1; const vector<int>::iterator it1; *it1 = 10; // totally fine! ++it; // can t change iterator // acts like const int* it2; vector<int>::const_iterator it2; *it2 = 10; // can t change element ++it2; // can move iterator
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28 const const const
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34 Vector<string> defv; // initialisation Vector<string> fillv(10, "hello"); // initialisation Vector<string> copyv(defc); // initialisation Vector<string> v = defv; // initialisation v = fillv; // assignment
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36 Vector<string> defv; // initialisation Vector<string> fillv(10, "hello"); // initialisation Vector<string> copyv(defc); // initialisation Vector<string> v = defv; // initialisation v = fillv; // assignment
37 Vector<string> defv; // normal constructor // initialisation Vector<string> fillv(10, "hello"); // initialisation Vector<string> copyv(defc); // initialisation Vector<string> v = defv; // initialisation v = fillv; // assignment
38 Vector<string> defv; // normal constructor // initialisation Vector<string> fillv(10, "hello"); // normal constructor // initialisation Vector<string> copyv(defc); // initialisation Vector<string> v = defv; // initialisation v = fillv; // assignment
39 Vector<string> defv; // normal constructor // initialisation Vector<string> fillv(10, "hello"); // normal constructor // initialisation Vector<string> copyv(defc); // copy constructor // initialisation Vector<string> v = defv; // initialisation v = fillv; // assignment
40 Vector<string> defv; // normal constructor // initialisation Vector<string> fillv(10, "hello"); // normal constructor // initialisation Vector<string> copyv(defc); // copy constructor // initialisation Vector<string> v = defv; // initialisation // copy constructor v = fillv; // assignment
41 Vector<string> defv; // normal constructor // initialisation Vector<string> fillv(10, "hello"); // normal constructor // initialisation Vector<string> copyv(defc); // copy constructor // initialisation Vector<string> v = defv; // initialisation v = fillv; // assignment // copy constructor // copy assingment
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43 This might not always do what you want
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45 private: int privint; } class MyClass { public: MyClass() { privint = 3; } // default constructor
46 MyClass defc; // calls default constructor MyClass buggy(); // DOESNT WORK!
47 MyClass defc; // calls default constructor MyClass buggy(); // DOESNT WORK!
48 MyClass defc; // calls default constructor // Treated as function declaration MyClass buggy(); // DOESNT WORK! This is called C++ s Most Vexing Parse
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50 // vector<string> v created earlier // copy constructor called vector<string> copyv(v); vector<string> copyv2 = v;
51 MyClass::MyClass (const MyClass& rhs) { } // implementation
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53 vector<int> a: ElemType* elems; int logicalsize; int allocatedsize; 0 8 Vector<int> a;
54 vector<int> a: ElemType* elems; 8 int logicalsize; int allocatedsize; 1 8 Vector<int> a; a.push_back(8);
55 vector<int> a: ElemType* elems; 8 6 int logicalsize; int allocatedsize; 2 8 Vector<int> a; a.push_back(8); a.push_back(6);
56 vector<int> a: ElemType* elems; int logicalsize; int allocatedsize; 3 8 Vector<int> a; a.push_back(8); a.push_back(6); a.push_back(7);
57 vector<int> a: ElemType* elems; int logicalsize; int allocatedsize; 3 8 vector<int> b: ElemType* elems; int logicalsize; 3 int allocatedsize; 8 Vector<int> a; a.push_back(8); a.push_back(6); a.push_back(7); Vector<int> b = a;
58 vector<int> a: ElemType* elems; int logicalsize; int allocatedsize; Changing the value of b also changed the value of a! vector<int> b: ElemType* elems; int logicalsize; 3 int allocatedsize; 8 Vector<int> a; a.push_back(8); a.push_back(6); a.push_back(7); Vector<int> b = a; b[0] = 9;
59 vector<int> a: ElemType* elems; int logicalsize; int allocatedsize; vector<int> b: ElemType* elems; int logicalsize; 3 int allocatedsize; 8 Vector<int> a; a.push_back(8); a.push_back(6); a.push_back(7); Vector<int> b = a; b[0] = 9;
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61 MyVector.pro
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63 // vector<string> v, v2 created earlier // copy constructor called vector<string> copyv = v; // copy assignment copyv = v2;
64 class MyClass { public: MyClass& operator=(const MyClass& rhs) { } private: int privint; }
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Tell compiler ValueType is a generic type. public: void push_back(const ValueType& elem); // rest of implementation }
template class StrVector { Tell compiler ValueType is a generic type. public: void push_back(const ValueType& elem); // rest of implementation } template class
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