What is the method of using C++ template?
This article shows you how to use the C++ template, the content is concise and easy to understand, it will definitely brighten your eyes. I hope you can get something through the detailed introduction of this article.
The application of templates in C++ programming language greatly improves the efficiency of program development to a certain extent. Let's explain the basic concepts of C++ template in detail.
Some time ago, I re-learned Clayboy, mainly looking at C++ programming ideas and C++ design new thinking. We have a better understanding of the use of templates, which are summarized as follows:
Common examples of C++ templates are listed below:
1. Static members of C++ template class
Template
< typename T>Struct testClass {static int _ data;}; template
< >Int testClass
< char>:: _ data = 1; template
< >Int testClass
< long>:: _ data = 2; int main (void) {cout
< < boolalpha < < (1==testClass< char>:: _ data)
< < endl; cout < < boolalpha < < (2==testClass< long>:: _ data)
< < endl; } 2. C++模板类偏特化 template < class I, class O>Struct testClass {testClass () {cout
< < "I, O" < < endl; } }; template < class T>Struct testClass
< T*, T*>{testClass () {cout
< < "T*, T*" < < endl; } }; template < class T>Struct testClass
< const T*, T*>{testClass () {cout
< < "const T*, T*" < < endl; } }; int main( void ) { testClass< int, char>Obj1; testClass
< int*, int*>Obj2; testClass
< const int*, int*>Obj3;}
3. Class template + function template
Template
< class T>Struct testClass
{
Void swap (testClass
< T>&) {cout
< < "swap()" < < endl; } }; template < class T>Inline void swap (testClass
< T>& x
TestClass
< T>& y)
{
X.swap (y)
}
Int main (void)
{
TestClass
< int>Obj1
TestClass
< int>Obj2
Swap (obj1, obj2)
}
4. Class member function template
Struct testClass {template
< class T>Void mfun (const T & t) {cout
< < t < < endl; } template < class T>Operator T () {return T ();}}; int main (void) {testClass obj; obj.mfun (1); int I = obj; cout
< < i < < endl; } 5. 缺省C++模板参数推导 template < class T>Struct test {T a;}; template
< class I, class O=test< I>> struct testClass {I b; O c;}; void main () {}
6. Untyped C++ template parameters
Template
< class T, int n>Struct testClass {T _ t; testClass (): _ t (n) {}}; int main (void) {testClass
< int,1>Obj1; testClass
< int,2>Obj2;}
7. Empty template parameter
Template
< class T>Struct testClass
Template
< class T>Bool operator== (const testClass
< T>&
Const testClass
< T>&)
{
Return false
}
Template
< class T>Struct testClass
{
Friend bool operator==
< >(const testClass&, const testClass&)
}
Void main ()
{
}
8. Template template class
Struct Widget1 {template
< typename T>T foo () {}}; template
< template< class T>Class X > struct Widget2 {}; void main () {cout < < 3 < <'\ nails;} the above is how to use C++ templates. Have you learned any knowledge or skills? If you want to learn more skills or enrich your knowledge reserve, you are welcome to follow the industry information channel.
