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Jidong Xiao
2023-09-25 23:51:18 -04:00
parent f7d7da368f
commit d558312b1d
1 changed files with 8 additions and 8 deletions
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lectures/08_vector_implementation/README.md
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@@ -51,10 +51,10 @@ template <class T> void Vec<T>::create(...
## 8.3 Syntax and Compilation
- Templated classes and templated member functions are not created/compiled/instantiated until they are
needed. Compilation of the class declaration is triggered by a line of the form: Vec<int> v1; with int
replacing T. This also compiles the default constructor for Vec<int> because it is used here. Other member
needed. Compilation of the class declaration is triggered by a line of the form: Vec&lt;int&gt; v1; with int
replacing T. This also compiles the default constructor for Vec&lt;int&gt; because it is used here. Other member
functions are not compiled unless they are used.
- When a different type is used with Vec, for example in the declaration: Vec<double> z; the template class
- When a different type is used with Vec, for example in the declaration: Vec&lt;double&gt; z; the template class
declaration is compiled again, this time with double replacing T instead of int. Again, however, only the
member functions used are compiled.
- This is very different from ordinary classes, which are usually compiled separately and all functions are compiled
@@ -69,7 +69,7 @@ about functions being “multiply defined”. Some of you have already seen thes
## 8.4 Member Variables
Now, looking inside the Vec<T> class at the member variables:
Now, looking inside the Vec&lt;T&gt; class at the member variables:
- m_data is a pointer to the start of the array (after it has been allocated). Recall the close relationship between
pointers and arrays.
- m_size indicates the number of locations currently in use in the vector. This is exactly what the size()
@@ -81,13 +81,13 @@ m alloc.
## 8.5 Typedefs
- Several types are created through typedef statements in the first public area of Vec. Once created the names
are used as ordinary type names. For example Vec<int>::size type is the return type of the size() function,
are used as ordinary type names. For example Vec&lt;int&gt;::size type is the return type of the size() function,
defined here as an unsigned int.
## 8.6 operator[]
Access to the individual locations of a Vec is provided through operator[]. Syntactically, use of this operator
is translated by the compiler into a call to a function called operator[]. For example, if v is a Vec<int>,
is translated by the compiler into a call to a function called operator[]. For example, if v is a Vec&lt;int&gt;,
then:
```cpp
v[i] = 5;
@@ -119,9 +119,9 @@ want to create a copy of the entire array! Let’s look at this more closely...
## 8.8 Exercise
Suppose we used the default version of the assignment operator and copy constructor in our Vec<T> class. What
Suppose we used the default version of the assignment operator and copy constructor in our Vec&lt;T&gt; class. What
would be the output of the following program? Assume all of the operations except the copy constructor behave as
they would with a std::vector<double>.
they would with a std::vector&lt;double&gt;.
```cpp
Vec<double> v(4, 0.0);
v[0] = 13.1; v[2] = 3.14;