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This class definition says that Vec is a template type, and that it takes a single type parameter In the body of the class definition, we'll call that type T Whenever we use T, the compiler will replace it with whatever type the user names when creating a Vec So for example, if we write
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this definition will cause the compiler to instantiate ( 812/142) a version of the Vec class in which it replaces each reference to T by int The code that the compiler generates for that class will resolve expressions that involve T as if they had been written using int Thus, because we used the type parameter T in the declaration of data and limit, the type of these pointers depends on the type of the objects that the Vec will hold This type is not known until the definition of a Vec is instantiated Once we say that we want a Vec<int>, the types of data and limit are known: They will be int* for this instance of Vec Similarly, if we also used Vec<string>, then the compiler would generate a second, different instantiation of Vec that bound T to string, thereby giving data and limit the type string* in that instantiation
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Because our class will allocate its array dynamically ( 1062/184), we might expect that we should allocate space for our Vec by using new T[n], where n is the number of elements we want to allocate However, remember that not only does new T[n] allocate space, but it also initializes the elements by running the default constructor for T If we were to use new T[n], then we would be imposing a requirement on T: Users could create a Vec<T> only if T has a default constructor The standard vector class imposes no such restriction Because we want to emulate standard vectors, we don't want to impose this restriction either It turns out that the library provides a memory allocation class that offers more detailed control over memory allocation This class will suit our needs exactly, if we use it instead of new and delete The class lets us allocate raw memory, and then in a separate step build objects in that memory Rather than diving right into the details of that class, we will assume that eventually we shall have to write some utility functions that will manage the memory for us For now, we'll assume that these functions exist, and we'll use them in completing the Vec class As we use them, we'll get a better picture of just what we would like them to do, so that when it's time to implement them, We will know just what it is that we need to implement These new utility members will be part of the private implementation of our class They will be responsible for allocating and deallocating the memory that we need, and for initializing and destroying the elements stored in the Vec Thus, these functions will manage our pointers data and limit Only these memory management functions will give new values to these data members The public members of Vec will read data and 1imit, but will not change them When the public members need to do something, such as constructing a new Vec that needs to change the value of data or limit, they will call an appropriate memory- management function to do so This strategy will let us partition our work: One set of members will provide the interface to our user, and another set will deal with the implementation details We'll come back to fill in the details of these utility functions in 115/203
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