C + + Programming Method 4: Class template

Class template

When defining a class, you can also abstract some types and replace them with template parameters, making the class more versatile. This class is called a template class, for example:

Template <typename t> class A

{

T data;

Public
How class template member functions are defined one: defined in a class template

void print () {cout << data << Endl;}

}

How class template member functions are defined two: outside the class template

template<typename t> void A::p rint () {cout <<data << Endl;}

Class Templates (2)

After class templates instantiate a class, the class is instantiated as an object

Class template

Template parameters for the class template

1. Type parameters: Using TypeName or class tags

2. Non-type parameter: Integer, enumeration, pointer (to object or function), reference (Reference object or reference function). Where the integer type is more commonly used, such as:

Template<typename t,unsigned size>

Class Array

{

T Elems[size];

...

}

Array<char,10> array0;//defining an object with a class template instance

Template parameter is another class template

The corresponding declaration form is as follows:

Template<typename t,template<typename tt0,typename tt1> class a>

struct FOO

{

A<t,t> Bar;

};

C + + Programming Method 4: Class template